kc3-lang/libjpeg-turbo/simd/jsimd_arm_neon.S
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Hash : bd49803f
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Date : 2016-02-19T08:53:33
Use consistent/modern code formatting for pointers The convention used by libjpeg: type * variable; is not very common anymore, because it looks too much like multiplication. Some (particularly C++ programmers) prefer to tuck the pointer symbol against the type: type* variable; to emphasize that a pointer to a type is effectively a new type. However, this can also be confusing, since defining multiple variables on the same line would not work properly: type* variable1, variable2; /* Only variable1 is actually a pointer. */ This commit reformats the entirety of the libjpeg-turbo code base so that it uses the same code formatting convention for pointers that the TurboJPEG API code uses: type *variable1, *variable2; This seems to be the most common convention among C programmers, and it is the convention used by other codec libraries, such as libpng and libtiff.
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simd/jsimd_arm_neon.S
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/* * ARMv7 NEON optimizations for libjpeg-turbo * * Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies). * All rights reserved. * Author: Siarhei Siamashka <siarhei.siamashka@nokia.com> * Copyright (C) 2014 Siarhei Siamashka. All Rights Reserved. * Copyright (C) 2014 Linaro Limited. All Rights Reserved. * Copyright (C) 2015 D. R. Commander. All Rights Reserved. * Copyright (C) 2015-2016 Matthieu Darbois. All Rights Reserved. * * This software is provided 'as-is', without any express or implied * warranty. In no event will the authors be held liable for any damages * arising from the use of this software. * * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 3. This notice may not be removed or altered from any source distribution. */ #if defined(__linux__) && defined(__ELF__) .section .note.GNU-stack, "", %progbits /* mark stack as non-executable */ #endif .text .fpu neon .arch armv7a .object_arch armv4 .arm #define RESPECT_STRICT_ALIGNMENT 1 /*****************************************************************************/ /* Supplementary macro for setting function attributes */ .macro asm_function fname #ifdef __APPLE__ .globl _\fname _\fname: #else .global \fname #ifdef __ELF__ .hidden \fname .type \fname, %function #endif \fname: #endif .endm /* Transpose a block of 4x4 coefficients in four 64-bit registers */ .macro transpose_4x4 x0, x1, x2, x3 vtrn.16 \x0, \x1 vtrn.16 \x2, \x3 vtrn.32 \x0, \x2 vtrn.32 \x1, \x3 .endm #define CENTERJSAMPLE 128 /*****************************************************************************/ /* * Perform dequantization and inverse DCT on one block of coefficients. * * GLOBAL(void) * jsimd_idct_islow_neon (void *dct_table, JCOEFPTR coef_block, * JSAMPARRAY output_buf, JDIMENSION output_col) */ #define FIX_0_298631336 (2446) #define FIX_0_390180644 (3196) #define FIX_0_541196100 (4433) #define FIX_0_765366865 (6270) #define FIX_0_899976223 (7373) #define FIX_1_175875602 (9633) #define FIX_1_501321110 (12299) #define FIX_1_847759065 (15137) #define FIX_1_961570560 (16069) #define FIX_2_053119869 (16819) #define FIX_2_562915447 (20995) #define FIX_3_072711026 (25172) #define FIX_1_175875602_MINUS_1_961570560 (FIX_1_175875602 - FIX_1_961570560) #define FIX_1_175875602_MINUS_0_390180644 (FIX_1_175875602 - FIX_0_390180644) #define FIX_0_541196100_MINUS_1_847759065 (FIX_0_541196100 - FIX_1_847759065) #define FIX_3_072711026_MINUS_2_562915447 (FIX_3_072711026 - FIX_2_562915447) #define FIX_0_298631336_MINUS_0_899976223 (FIX_0_298631336 - FIX_0_899976223) #define FIX_1_501321110_MINUS_0_899976223 (FIX_1_501321110 - FIX_0_899976223) #define FIX_2_053119869_MINUS_2_562915447 (FIX_2_053119869 - FIX_2_562915447) #define FIX_0_541196100_PLUS_0_765366865 (FIX_0_541196100 + FIX_0_765366865) /* * Reference SIMD-friendly 1-D ISLOW iDCT C implementation. * Uses some ideas from the comments in 'simd/jiss2int-64.asm' */ #define REF_1D_IDCT(xrow0, xrow1, xrow2, xrow3, xrow4, xrow5, xrow6, xrow7) \ { \ DCTELEM row0, row1, row2, row3, row4, row5, row6, row7; \ JLONG q1, q2, q3, q4, q5, q6, q7; \ JLONG tmp11_plus_tmp2, tmp11_minus_tmp2; \ \ /* 1-D iDCT input data */ \ row0 = xrow0; \ row1 = xrow1; \ row2 = xrow2; \ row3 = xrow3; \ row4 = xrow4; \ row5 = xrow5; \ row6 = xrow6; \ row7 = xrow7; \ \ q5 = row7 + row3; \ q4 = row5 + row1; \ q6 = MULTIPLY(q5, FIX_1_175875602_MINUS_1_961570560) + \ MULTIPLY(q4, FIX_1_175875602); \ q7 = MULTIPLY(q5, FIX_1_175875602) + \ MULTIPLY(q4, FIX_1_175875602_MINUS_0_390180644); \ q2 = MULTIPLY(row2, FIX_0_541196100) + \ MULTIPLY(row6, FIX_0_541196100_MINUS_1_847759065); \ q4 = q6; \ q3 = ((JLONG) row0 - (JLONG) row4) << 13; \ q6 += MULTIPLY(row5, -FIX_2_562915447) + \ MULTIPLY(row3, FIX_3_072711026_MINUS_2_562915447); \ /* now we can use q1 (reloadable constants have been used up) */ \ q1 = q3 + q2; \ q4 += MULTIPLY(row7, FIX_0_298631336_MINUS_0_899976223) + \ MULTIPLY(row1, -FIX_0_899976223); \ q5 = q7; \ q1 = q1 + q6; \ q7 += MULTIPLY(row7, -FIX_0_899976223) + \ MULTIPLY(row1, FIX_1_501321110_MINUS_0_899976223); \ \ /* (tmp11 + tmp2) has been calculated (out_row1 before descale) */ \ tmp11_plus_tmp2 = q1; \ row1 = 0; \ \ q1 = q1 - q6; \ q5 += MULTIPLY(row5, FIX_2_053119869_MINUS_2_562915447) + \ MULTIPLY(row3, -FIX_2_562915447); \ q1 = q1 - q6; \ q6 = MULTIPLY(row2, FIX_0_541196100_PLUS_0_765366865) + \ MULTIPLY(row6, FIX_0_541196100); \ q3 = q3 - q2; \ \ /* (tmp11 - tmp2) has been calculated (out_row6 before descale) */ \ tmp11_minus_tmp2 = q1; \ \ q1 = ((JLONG) row0 + (JLONG) row4) << 13; \ q2 = q1 + q6; \ q1 = q1 - q6; \ \ /* pick up the results */ \ tmp0 = q4; \ tmp1 = q5; \ tmp2 = (tmp11_plus_tmp2 - tmp11_minus_tmp2) / 2; \ tmp3 = q7; \ tmp10 = q2; \ tmp11 = (tmp11_plus_tmp2 + tmp11_minus_tmp2) / 2; \ tmp12 = q3; \ tmp13 = q1; \ } #define XFIX_0_899976223 d0[0] #define XFIX_0_541196100 d0[1] #define XFIX_2_562915447 d0[2] #define XFIX_0_298631336_MINUS_0_899976223 d0[3] #define XFIX_1_501321110_MINUS_0_899976223 d1[0] #define XFIX_2_053119869_MINUS_2_562915447 d1[1] #define XFIX_0_541196100_PLUS_0_765366865 d1[2] #define XFIX_1_175875602 d1[3] #define XFIX_1_175875602_MINUS_0_390180644 d2[0] #define XFIX_0_541196100_MINUS_1_847759065 d2[1] #define XFIX_3_072711026_MINUS_2_562915447 d2[2] #define XFIX_1_175875602_MINUS_1_961570560 d2[3] .balign 16 jsimd_idct_islow_neon_consts: .short FIX_0_899976223 /* d0[0] */ .short FIX_0_541196100 /* d0[1] */ .short FIX_2_562915447 /* d0[2] */ .short FIX_0_298631336_MINUS_0_899976223 /* d0[3] */ .short FIX_1_501321110_MINUS_0_899976223 /* d1[0] */ .short FIX_2_053119869_MINUS_2_562915447 /* d1[1] */ .short FIX_0_541196100_PLUS_0_765366865 /* d1[2] */ .short FIX_1_175875602 /* d1[3] */ /* reloadable constants */ .short FIX_1_175875602_MINUS_0_390180644 /* d2[0] */ .short FIX_0_541196100_MINUS_1_847759065 /* d2[1] */ .short FIX_3_072711026_MINUS_2_562915447 /* d2[2] */ .short FIX_1_175875602_MINUS_1_961570560 /* d2[3] */ asm_function jsimd_idct_islow_neon DCT_TABLE .req r0 COEF_BLOCK .req r1 OUTPUT_BUF .req r2 OUTPUT_COL .req r3 TMP1 .req r0 TMP2 .req r1 TMP3 .req r2 TMP4 .req ip ROW0L .req d16 ROW0R .req d17 ROW1L .req d18 ROW1R .req d19 ROW2L .req d20 ROW2R .req d21 ROW3L .req d22 ROW3R .req d23 ROW4L .req d24 ROW4R .req d25 ROW5L .req d26 ROW5R .req d27 ROW6L .req d28 ROW6R .req d29 ROW7L .req d30 ROW7R .req d31 /* Load and dequantize coefficients into NEON registers * with the following allocation: * 0 1 2 3 | 4 5 6 7 * ---------+-------- * 0 | d16 | d17 ( q8 ) * 1 | d18 | d19 ( q9 ) * 2 | d20 | d21 ( q10 ) * 3 | d22 | d23 ( q11 ) * 4 | d24 | d25 ( q12 ) * 5 | d26 | d27 ( q13 ) * 6 | d28 | d29 ( q14 ) * 7 | d30 | d31 ( q15 ) */ adr ip, jsimd_idct_islow_neon_consts vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK, :128]! vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]! vld1.16 {d20, d21, d22, d23}, [COEF_BLOCK, :128]! vmul.s16 q8, q8, q0 vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]! vmul.s16 q9, q9, q1 vld1.16 {d24, d25, d26, d27}, [COEF_BLOCK, :128]! vmul.s16 q10, q10, q2 vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]! vmul.s16 q11, q11, q3 vld1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128] vmul.s16 q12, q12, q0 vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]! vmul.s16 q14, q14, q2 vmul.s16 q13, q13, q1 vld1.16 {d0, d1, d2, d3}, [ip, :128] /* load constants */ add ip, ip, #16 vmul.s16 q15, q15, q3 vpush {d8-d15} /* save NEON registers */ /* 1-D IDCT, pass 1, left 4x8 half */ vadd.s16 d4, ROW7L, ROW3L vadd.s16 d5, ROW5L, ROW1L vmull.s16 q6, d4, XFIX_1_175875602_MINUS_1_961570560 vmlal.s16 q6, d5, XFIX_1_175875602 vmull.s16 q7, d4, XFIX_1_175875602 /* Check for the zero coefficients in the right 4x8 half */ push {r4, r5} vmlal.s16 q7, d5, XFIX_1_175875602_MINUS_0_390180644 vsubl.s16 q3, ROW0L, ROW4L ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 1 * 8))] vmull.s16 q2, ROW2L, XFIX_0_541196100 vmlal.s16 q2, ROW6L, XFIX_0_541196100_MINUS_1_847759065 orr r0, r4, r5 vmov q4, q6 vmlsl.s16 q6, ROW5L, XFIX_2_562915447 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 2 * 8))] vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447 vshl.s32 q3, q3, #13 orr r0, r0, r4 vmlsl.s16 q4, ROW1L, XFIX_0_899976223 orr r0, r0, r5 vadd.s32 q1, q3, q2 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 3 * 8))] vmov q5, q7 vadd.s32 q1, q1, q6 orr r0, r0, r4 vmlsl.s16 q7, ROW7L, XFIX_0_899976223 orr r0, r0, r5 vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223 vrshrn.s32 ROW1L, q1, #11 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 4 * 8))] vsub.s32 q1, q1, q6 vmlal.s16 q5, ROW5L, XFIX_2_053119869_MINUS_2_562915447 orr r0, r0, r4 vmlsl.s16 q5, ROW3L, XFIX_2_562915447 orr r0, r0, r5 vsub.s32 q1, q1, q6 vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 5 * 8))] vmlal.s16 q6, ROW6L, XFIX_0_541196100 vsub.s32 q3, q3, q2 orr r0, r0, r4 vrshrn.s32 ROW6L, q1, #11 orr r0, r0, r5 vadd.s32 q1, q3, q5 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 6 * 8))] vsub.s32 q3, q3, q5 vaddl.s16 q5, ROW0L, ROW4L orr r0, r0, r4 vrshrn.s32 ROW2L, q1, #11 orr r0, r0, r5 vrshrn.s32 ROW5L, q3, #11 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 7 * 8))] vshl.s32 q5, q5, #13 vmlal.s16 q4, ROW7L, XFIX_0_298631336_MINUS_0_899976223 orr r0, r0, r4 vadd.s32 q2, q5, q6 orrs r0, r0, r5 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 0 * 8))] vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 orr r0, r4, r5 vsub.s32 q3, q1, q4 pop {r4, r5} vrshrn.s32 ROW7L, q2, #11 vrshrn.s32 ROW3L, q5, #11 vrshrn.s32 ROW0L, q6, #11 vrshrn.s32 ROW4L, q3, #11 beq 3f /* Go to do some special handling for the sparse right 4x8 half */ /* 1-D IDCT, pass 1, right 4x8 half */ vld1.s16 {d2}, [ip, :64] /* reload constants */ vadd.s16 d10, ROW7R, ROW3R vadd.s16 d8, ROW5R, ROW1R /* Transpose left 4x8 half */ vtrn.16 ROW6L, ROW7L vmull.s16 q6, d10, XFIX_1_175875602_MINUS_1_961570560 vmlal.s16 q6, d8, XFIX_1_175875602 vtrn.16 ROW2L, ROW3L vmull.s16 q7, d10, XFIX_1_175875602 vmlal.s16 q7, d8, XFIX_1_175875602_MINUS_0_390180644 vtrn.16 ROW0L, ROW1L vsubl.s16 q3, ROW0R, ROW4R vmull.s16 q2, ROW2R, XFIX_0_541196100 vmlal.s16 q2, ROW6R, XFIX_0_541196100_MINUS_1_847759065 vtrn.16 ROW4L, ROW5L vmov q4, q6 vmlsl.s16 q6, ROW5R, XFIX_2_562915447 vmlal.s16 q6, ROW3R, XFIX_3_072711026_MINUS_2_562915447 vtrn.32 ROW1L, ROW3L vshl.s32 q3, q3, #13 vmlsl.s16 q4, ROW1R, XFIX_0_899976223 vtrn.32 ROW4L, ROW6L vadd.s32 q1, q3, q2 vmov q5, q7 vadd.s32 q1, q1, q6 vtrn.32 ROW0L, ROW2L vmlsl.s16 q7, ROW7R, XFIX_0_899976223 vmlal.s16 q7, ROW1R, XFIX_1_501321110_MINUS_0_899976223 vrshrn.s32 ROW1R, q1, #11 vtrn.32 ROW5L, ROW7L vsub.s32 q1, q1, q6 vmlal.s16 q5, ROW5R, XFIX_2_053119869_MINUS_2_562915447 vmlsl.s16 q5, ROW3R, XFIX_2_562915447 vsub.s32 q1, q1, q6 vmull.s16 q6, ROW2R, XFIX_0_541196100_PLUS_0_765366865 vmlal.s16 q6, ROW6R, XFIX_0_541196100 vsub.s32 q3, q3, q2 vrshrn.s32 ROW6R, q1, #11 vadd.s32 q1, q3, q5 vsub.s32 q3, q3, q5 vaddl.s16 q5, ROW0R, ROW4R vrshrn.s32 ROW2R, q1, #11 vrshrn.s32 ROW5R, q3, #11 vshl.s32 q5, q5, #13 vmlal.s16 q4, ROW7R, XFIX_0_298631336_MINUS_0_899976223 vadd.s32 q2, q5, q6 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 vsub.s32 q3, q1, q4 vrshrn.s32 ROW7R, q2, #11 vrshrn.s32 ROW3R, q5, #11 vrshrn.s32 ROW0R, q6, #11 vrshrn.s32 ROW4R, q3, #11 /* Transpose right 4x8 half */ vtrn.16 ROW6R, ROW7R vtrn.16 ROW2R, ROW3R vtrn.16 ROW0R, ROW1R vtrn.16 ROW4R, ROW5R vtrn.32 ROW1R, ROW3R vtrn.32 ROW4R, ROW6R vtrn.32 ROW0R, ROW2R vtrn.32 ROW5R, ROW7R 1: /* 1-D IDCT, pass 2 (normal variant), left 4x8 half */ vld1.s16 {d2}, [ip, :64] /* reload constants */ vmull.s16 q6, ROW1R, XFIX_1_175875602 /* ROW5L <-> ROW1R */ vmlal.s16 q6, ROW1L, XFIX_1_175875602 vmlal.s16 q6, ROW3R, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */ vmlal.s16 q6, ROW3L, XFIX_1_175875602_MINUS_1_961570560 vmull.s16 q7, ROW3R, XFIX_1_175875602 /* ROW7L <-> ROW3R */ vmlal.s16 q7, ROW3L, XFIX_1_175875602 vmlal.s16 q7, ROW1R, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */ vmlal.s16 q7, ROW1L, XFIX_1_175875602_MINUS_0_390180644 vsubl.s16 q3, ROW0L, ROW0R /* ROW4L <-> ROW0R */ vmull.s16 q2, ROW2L, XFIX_0_541196100 vmlal.s16 q2, ROW2R, XFIX_0_541196100_MINUS_1_847759065 /* ROW6L <-> ROW2R */ vmov q4, q6 vmlsl.s16 q6, ROW1R, XFIX_2_562915447 /* ROW5L <-> ROW1R */ vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447 vshl.s32 q3, q3, #13 vmlsl.s16 q4, ROW1L, XFIX_0_899976223 vadd.s32 q1, q3, q2 vmov q5, q7 vadd.s32 q1, q1, q6 vmlsl.s16 q7, ROW3R, XFIX_0_899976223 /* ROW7L <-> ROW3R */ vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223 vshrn.s32 ROW1L, q1, #16 vsub.s32 q1, q1, q6 vmlal.s16 q5, ROW1R, XFIX_2_053119869_MINUS_2_562915447 /* ROW5L <-> ROW1R */ vmlsl.s16 q5, ROW3L, XFIX_2_562915447 vsub.s32 q1, q1, q6 vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865 vmlal.s16 q6, ROW2R, XFIX_0_541196100 /* ROW6L <-> ROW2R */ vsub.s32 q3, q3, q2 vshrn.s32 ROW2R, q1, #16 /* ROW6L <-> ROW2R */ vadd.s32 q1, q3, q5 vsub.s32 q3, q3, q5 vaddl.s16 q5, ROW0L, ROW0R /* ROW4L <-> ROW0R */ vshrn.s32 ROW2L, q1, #16 vshrn.s32 ROW1R, q3, #16 /* ROW5L <-> ROW1R */ vshl.s32 q5, q5, #13 vmlal.s16 q4, ROW3R, XFIX_0_298631336_MINUS_0_899976223 /* ROW7L <-> ROW3R */ vadd.s32 q2, q5, q6 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 vsub.s32 q3, q1, q4 vshrn.s32 ROW3R, q2, #16 /* ROW7L <-> ROW3R */ vshrn.s32 ROW3L, q5, #16 vshrn.s32 ROW0L, q6, #16 vshrn.s32 ROW0R, q3, #16 /* ROW4L <-> ROW0R */ /* 1-D IDCT, pass 2, right 4x8 half */ vld1.s16 {d2}, [ip, :64] /* reload constants */ vmull.s16 q6, ROW5R, XFIX_1_175875602 vmlal.s16 q6, ROW5L, XFIX_1_175875602 /* ROW5L <-> ROW1R */ vmlal.s16 q6, ROW7R, XFIX_1_175875602_MINUS_1_961570560 vmlal.s16 q6, ROW7L, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */ vmull.s16 q7, ROW7R, XFIX_1_175875602 vmlal.s16 q7, ROW7L, XFIX_1_175875602 /* ROW7L <-> ROW3R */ vmlal.s16 q7, ROW5R, XFIX_1_175875602_MINUS_0_390180644 vmlal.s16 q7, ROW5L, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */ vsubl.s16 q3, ROW4L, ROW4R /* ROW4L <-> ROW0R */ vmull.s16 q2, ROW6L, XFIX_0_541196100 /* ROW6L <-> ROW2R */ vmlal.s16 q2, ROW6R, XFIX_0_541196100_MINUS_1_847759065 vmov q4, q6 vmlsl.s16 q6, ROW5R, XFIX_2_562915447 vmlal.s16 q6, ROW7L, XFIX_3_072711026_MINUS_2_562915447 /* ROW7L <-> ROW3R */ vshl.s32 q3, q3, #13 vmlsl.s16 q4, ROW5L, XFIX_0_899976223 /* ROW5L <-> ROW1R */ vadd.s32 q1, q3, q2 vmov q5, q7 vadd.s32 q1, q1, q6 vmlsl.s16 q7, ROW7R, XFIX_0_899976223 vmlal.s16 q7, ROW5L, XFIX_1_501321110_MINUS_0_899976223 /* ROW5L <-> ROW1R */ vshrn.s32 ROW5L, q1, #16 /* ROW5L <-> ROW1R */ vsub.s32 q1, q1, q6 vmlal.s16 q5, ROW5R, XFIX_2_053119869_MINUS_2_562915447 vmlsl.s16 q5, ROW7L, XFIX_2_562915447 /* ROW7L <-> ROW3R */ vsub.s32 q1, q1, q6 vmull.s16 q6, ROW6L, XFIX_0_541196100_PLUS_0_765366865 /* ROW6L <-> ROW2R */ vmlal.s16 q6, ROW6R, XFIX_0_541196100 vsub.s32 q3, q3, q2 vshrn.s32 ROW6R, q1, #16 vadd.s32 q1, q3, q5 vsub.s32 q3, q3, q5 vaddl.s16 q5, ROW4L, ROW4R /* ROW4L <-> ROW0R */ vshrn.s32 ROW6L, q1, #16 /* ROW6L <-> ROW2R */ vshrn.s32 ROW5R, q3, #16 vshl.s32 q5, q5, #13 vmlal.s16 q4, ROW7R, XFIX_0_298631336_MINUS_0_899976223 vadd.s32 q2, q5, q6 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 vsub.s32 q3, q1, q4 vshrn.s32 ROW7R, q2, #16 vshrn.s32 ROW7L, q5, #16 /* ROW7L <-> ROW3R */ vshrn.s32 ROW4L, q6, #16 /* ROW4L <-> ROW0R */ vshrn.s32 ROW4R, q3, #16 2: /* Descale to 8-bit and range limit */ vqrshrn.s16 d16, q8, #2 vqrshrn.s16 d17, q9, #2 vqrshrn.s16 d18, q10, #2 vqrshrn.s16 d19, q11, #2 vpop {d8-d15} /* restore NEON registers */ vqrshrn.s16 d20, q12, #2 /* Transpose the final 8-bit samples and do signed->unsigned conversion */ vtrn.16 q8, q9 vqrshrn.s16 d21, q13, #2 vqrshrn.s16 d22, q14, #2 vmov.u8 q0, #(CENTERJSAMPLE) vqrshrn.s16 d23, q15, #2 vtrn.8 d16, d17 vtrn.8 d18, d19 vadd.u8 q8, q8, q0 vadd.u8 q9, q9, q0 vtrn.16 q10, q11 /* Store results to the output buffer */ ldmia OUTPUT_BUF!, {TMP1, TMP2} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL vst1.8 {d16}, [TMP1] vtrn.8 d20, d21 vst1.8 {d17}, [TMP2] ldmia OUTPUT_BUF!, {TMP1, TMP2} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL vst1.8 {d18}, [TMP1] vadd.u8 q10, q10, q0 vst1.8 {d19}, [TMP2] ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL add TMP3, TMP3, OUTPUT_COL add TMP4, TMP4, OUTPUT_COL vtrn.8 d22, d23 vst1.8 {d20}, [TMP1] vadd.u8 q11, q11, q0 vst1.8 {d21}, [TMP2] vst1.8 {d22}, [TMP3] vst1.8 {d23}, [TMP4] bx lr 3: /* Left 4x8 half is done, right 4x8 half contains mostly zeros */ /* Transpose left 4x8 half */ vtrn.16 ROW6L, ROW7L vtrn.16 ROW2L, ROW3L vtrn.16 ROW0L, ROW1L vtrn.16 ROW4L, ROW5L vshl.s16 ROW0R, ROW0R, #2 /* PASS1_BITS */ vtrn.32 ROW1L, ROW3L vtrn.32 ROW4L, ROW6L vtrn.32 ROW0L, ROW2L vtrn.32 ROW5L, ROW7L cmp r0, #0 beq 4f /* Right 4x8 half has all zeros, go to 'sparse' second pass */ /* Only row 0 is non-zero for the right 4x8 half */ vdup.s16 ROW1R, ROW0R[1] vdup.s16 ROW2R, ROW0R[2] vdup.s16 ROW3R, ROW0R[3] vdup.s16 ROW4R, ROW0R[0] vdup.s16 ROW5R, ROW0R[1] vdup.s16 ROW6R, ROW0R[2] vdup.s16 ROW7R, ROW0R[3] vdup.s16 ROW0R, ROW0R[0] b 1b /* Go to 'normal' second pass */ 4: /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), left 4x8 half */ vld1.s16 {d2}, [ip, :64] /* reload constants */ vmull.s16 q6, ROW1L, XFIX_1_175875602 vmlal.s16 q6, ROW3L, XFIX_1_175875602_MINUS_1_961570560 vmull.s16 q7, ROW3L, XFIX_1_175875602 vmlal.s16 q7, ROW1L, XFIX_1_175875602_MINUS_0_390180644 vmull.s16 q2, ROW2L, XFIX_0_541196100 vshll.s16 q3, ROW0L, #13 vmov q4, q6 vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447 vmlsl.s16 q4, ROW1L, XFIX_0_899976223 vadd.s32 q1, q3, q2 vmov q5, q7 vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223 vadd.s32 q1, q1, q6 vadd.s32 q6, q6, q6 vmlsl.s16 q5, ROW3L, XFIX_2_562915447 vshrn.s32 ROW1L, q1, #16 vsub.s32 q1, q1, q6 vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865 vsub.s32 q3, q3, q2 vshrn.s32 ROW2R, q1, #16 /* ROW6L <-> ROW2R */ vadd.s32 q1, q3, q5 vsub.s32 q3, q3, q5 vshll.s16 q5, ROW0L, #13 vshrn.s32 ROW2L, q1, #16 vshrn.s32 ROW1R, q3, #16 /* ROW5L <-> ROW1R */ vadd.s32 q2, q5, q6 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 vsub.s32 q3, q1, q4 vshrn.s32 ROW3R, q2, #16 /* ROW7L <-> ROW3R */ vshrn.s32 ROW3L, q5, #16 vshrn.s32 ROW0L, q6, #16 vshrn.s32 ROW0R, q3, #16 /* ROW4L <-> ROW0R */ /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), right 4x8 half */ vld1.s16 {d2}, [ip, :64] /* reload constants */ vmull.s16 q6, ROW5L, XFIX_1_175875602 vmlal.s16 q6, ROW7L, XFIX_1_175875602_MINUS_1_961570560 vmull.s16 q7, ROW7L, XFIX_1_175875602 vmlal.s16 q7, ROW5L, XFIX_1_175875602_MINUS_0_390180644 vmull.s16 q2, ROW6L, XFIX_0_541196100 vshll.s16 q3, ROW4L, #13 vmov q4, q6 vmlal.s16 q6, ROW7L, XFIX_3_072711026_MINUS_2_562915447 vmlsl.s16 q4, ROW5L, XFIX_0_899976223 vadd.s32 q1, q3, q2 vmov q5, q7 vmlal.s16 q7, ROW5L, XFIX_1_501321110_MINUS_0_899976223 vadd.s32 q1, q1, q6 vadd.s32 q6, q6, q6 vmlsl.s16 q5, ROW7L, XFIX_2_562915447 vshrn.s32 ROW5L, q1, #16 /* ROW5L <-> ROW1R */ vsub.s32 q1, q1, q6 vmull.s16 q6, ROW6L, XFIX_0_541196100_PLUS_0_765366865 vsub.s32 q3, q3, q2 vshrn.s32 ROW6R, q1, #16 vadd.s32 q1, q3, q5 vsub.s32 q3, q3, q5 vshll.s16 q5, ROW4L, #13 vshrn.s32 ROW6L, q1, #16 /* ROW6L <-> ROW2R */ vshrn.s32 ROW5R, q3, #16 vadd.s32 q2, q5, q6 vsub.s32 q1, q5, q6 vadd.s32 q6, q2, q7 vsub.s32 q2, q2, q7 vadd.s32 q5, q1, q4 vsub.s32 q3, q1, q4 vshrn.s32 ROW7R, q2, #16 vshrn.s32 ROW7L, q5, #16 /* ROW7L <-> ROW3R */ vshrn.s32 ROW4L, q6, #16 /* ROW4L <-> ROW0R */ vshrn.s32 ROW4R, q3, #16 b 2b /* Go to epilogue */ .unreq DCT_TABLE .unreq COEF_BLOCK .unreq OUTPUT_BUF .unreq OUTPUT_COL .unreq TMP1 .unreq TMP2 .unreq TMP3 .unreq TMP4 .unreq ROW0L .unreq ROW0R .unreq ROW1L .unreq ROW1R .unreq ROW2L .unreq ROW2R .unreq ROW3L .unreq ROW3R .unreq ROW4L .unreq ROW4R .unreq ROW5L .unreq ROW5R .unreq ROW6L .unreq ROW6R .unreq ROW7L .unreq ROW7R /*****************************************************************************/ /* * jsimd_idct_ifast_neon * * This function contains a fast, not so accurate integer implementation of * the inverse DCT (Discrete Cosine Transform). It uses the same calculations * and produces exactly the same output as IJG's original 'jpeg_idct_ifast' * function from jidctfst.c * * Normally 1-D AAN DCT needs 5 multiplications and 29 additions. * But in ARM NEON case some extra additions are required because VQDMULH * instruction can't handle the constants larger than 1. So the expressions * like "x * 1.082392200" have to be converted to "x * 0.082392200 + x", * which introduces an extra addition. Overall, there are 6 extra additions * per 1-D IDCT pass, totalling to 5 VQDMULH and 35 VADD/VSUB instructions. */ #define XFIX_1_082392200 d0[0] #define XFIX_1_414213562 d0[1] #define XFIX_1_847759065 d0[2] #define XFIX_2_613125930 d0[3] .balign 16 jsimd_idct_ifast_neon_consts: .short (277 * 128 - 256 * 128) /* XFIX_1_082392200 */ .short (362 * 128 - 256 * 128) /* XFIX_1_414213562 */ .short (473 * 128 - 256 * 128) /* XFIX_1_847759065 */ .short (669 * 128 - 512 * 128) /* XFIX_2_613125930 */ asm_function jsimd_idct_ifast_neon DCT_TABLE .req r0 COEF_BLOCK .req r1 OUTPUT_BUF .req r2 OUTPUT_COL .req r3 TMP1 .req r0 TMP2 .req r1 TMP3 .req r2 TMP4 .req ip /* Load and dequantize coefficients into NEON registers * with the following allocation: * 0 1 2 3 | 4 5 6 7 * ---------+-------- * 0 | d16 | d17 ( q8 ) * 1 | d18 | d19 ( q9 ) * 2 | d20 | d21 ( q10 ) * 3 | d22 | d23 ( q11 ) * 4 | d24 | d25 ( q12 ) * 5 | d26 | d27 ( q13 ) * 6 | d28 | d29 ( q14 ) * 7 | d30 | d31 ( q15 ) */ adr ip, jsimd_idct_ifast_neon_consts vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK, :128]! vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]! vld1.16 {d20, d21, d22, d23}, [COEF_BLOCK, :128]! vmul.s16 q8, q8, q0 vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]! vmul.s16 q9, q9, q1 vld1.16 {d24, d25, d26, d27}, [COEF_BLOCK, :128]! vmul.s16 q10, q10, q2 vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]! vmul.s16 q11, q11, q3 vld1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128] vmul.s16 q12, q12, q0 vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]! vmul.s16 q14, q14, q2 vmul.s16 q13, q13, q1 vld1.16 {d0}, [ip, :64] /* load constants */ vmul.s16 q15, q15, q3 vpush {d8-d13} /* save NEON registers */ /* 1-D IDCT, pass 1 */ vsub.s16 q2, q10, q14 vadd.s16 q14, q10, q14 vsub.s16 q1, q11, q13 vadd.s16 q13, q11, q13 vsub.s16 q5, q9, q15 vadd.s16 q15, q9, q15 vqdmulh.s16 q4, q2, XFIX_1_414213562 vqdmulh.s16 q6, q1, XFIX_2_613125930 vadd.s16 q3, q1, q1 vsub.s16 q1, q5, q1 vadd.s16 q10, q2, q4 vqdmulh.s16 q4, q1, XFIX_1_847759065 vsub.s16 q2, q15, q13 vadd.s16 q3, q3, q6 vqdmulh.s16 q6, q2, XFIX_1_414213562 vadd.s16 q1, q1, q4 vqdmulh.s16 q4, q5, XFIX_1_082392200 vsub.s16 q10, q10, q14 vadd.s16 q2, q2, q6 vsub.s16 q6, q8, q12 vadd.s16 q12, q8, q12 vadd.s16 q9, q5, q4 vadd.s16 q5, q6, q10 vsub.s16 q10, q6, q10 vadd.s16 q6, q15, q13 vadd.s16 q8, q12, q14 vsub.s16 q3, q6, q3 vsub.s16 q12, q12, q14 vsub.s16 q3, q3, q1 vsub.s16 q1, q9, q1 vadd.s16 q2, q3, q2 vsub.s16 q15, q8, q6 vadd.s16 q1, q1, q2 vadd.s16 q8, q8, q6 vadd.s16 q14, q5, q3 vsub.s16 q9, q5, q3 vsub.s16 q13, q10, q2 vadd.s16 q10, q10, q2 /* Transpose */ vtrn.16 q8, q9 vsub.s16 q11, q12, q1 vtrn.16 q14, q15 vadd.s16 q12, q12, q1 vtrn.16 q10, q11 vtrn.16 q12, q13 vtrn.32 q9, q11 vtrn.32 q12, q14 vtrn.32 q8, q10 vtrn.32 q13, q15 vswp d28, d21 vswp d26, d19 /* 1-D IDCT, pass 2 */ vsub.s16 q2, q10, q14 vswp d30, d23 vadd.s16 q14, q10, q14 vswp d24, d17 vsub.s16 q1, q11, q13 vadd.s16 q13, q11, q13 vsub.s16 q5, q9, q15 vadd.s16 q15, q9, q15 vqdmulh.s16 q4, q2, XFIX_1_414213562 vqdmulh.s16 q6, q1, XFIX_2_613125930 vadd.s16 q3, q1, q1 vsub.s16 q1, q5, q1 vadd.s16 q10, q2, q4 vqdmulh.s16 q4, q1, XFIX_1_847759065 vsub.s16 q2, q15, q13 vadd.s16 q3, q3, q6 vqdmulh.s16 q6, q2, XFIX_1_414213562 vadd.s16 q1, q1, q4 vqdmulh.s16 q4, q5, XFIX_1_082392200 vsub.s16 q10, q10, q14 vadd.s16 q2, q2, q6 vsub.s16 q6, q8, q12 vadd.s16 q12, q8, q12 vadd.s16 q9, q5, q4 vadd.s16 q5, q6, q10 vsub.s16 q10, q6, q10 vadd.s16 q6, q15, q13 vadd.s16 q8, q12, q14 vsub.s16 q3, q6, q3 vsub.s16 q12, q12, q14 vsub.s16 q3, q3, q1 vsub.s16 q1, q9, q1 vadd.s16 q2, q3, q2 vsub.s16 q15, q8, q6 vadd.s16 q1, q1, q2 vadd.s16 q8, q8, q6 vadd.s16 q14, q5, q3 vsub.s16 q9, q5, q3 vsub.s16 q13, q10, q2 vpop {d8-d13} /* restore NEON registers */ vadd.s16 q10, q10, q2 vsub.s16 q11, q12, q1 vadd.s16 q12, q12, q1 /* Descale to 8-bit and range limit */ vmov.u8 q0, #0x80 vqshrn.s16 d16, q8, #5 vqshrn.s16 d17, q9, #5 vqshrn.s16 d18, q10, #5 vqshrn.s16 d19, q11, #5 vqshrn.s16 d20, q12, #5 vqshrn.s16 d21, q13, #5 vqshrn.s16 d22, q14, #5 vqshrn.s16 d23, q15, #5 vadd.u8 q8, q8, q0 vadd.u8 q9, q9, q0 vadd.u8 q10, q10, q0 vadd.u8 q11, q11, q0 /* Transpose the final 8-bit samples */ vtrn.16 q8, q9 vtrn.16 q10, q11 vtrn.32 q8, q10 vtrn.32 q9, q11 vtrn.8 d16, d17 vtrn.8 d18, d19 /* Store results to the output buffer */ ldmia OUTPUT_BUF!, {TMP1, TMP2} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL vst1.8 {d16}, [TMP1] vst1.8 {d17}, [TMP2] ldmia OUTPUT_BUF!, {TMP1, TMP2} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL vst1.8 {d18}, [TMP1] vtrn.8 d20, d21 vst1.8 {d19}, [TMP2] ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL add TMP3, TMP3, OUTPUT_COL add TMP4, TMP4, OUTPUT_COL vst1.8 {d20}, [TMP1] vtrn.8 d22, d23 vst1.8 {d21}, [TMP2] vst1.8 {d22}, [TMP3] vst1.8 {d23}, [TMP4] bx lr .unreq DCT_TABLE .unreq COEF_BLOCK .unreq OUTPUT_BUF .unreq OUTPUT_COL .unreq TMP1 .unreq TMP2 .unreq TMP3 .unreq TMP4 /*****************************************************************************/ /* * jsimd_idct_4x4_neon * * This function contains inverse-DCT code for getting reduced-size * 4x4 pixels output from an 8x8 DCT block. It uses the same calculations * and produces exactly the same output as IJG's original 'jpeg_idct_4x4' * function from jpeg-6b (jidctred.c). * * NOTE: jpeg-8 has an improved implementation of 4x4 inverse-DCT, which * requires much less arithmetic operations and hence should be faster. * The primary purpose of this particular NEON optimized function is * bit exact compatibility with jpeg-6b. * * TODO: a bit better instructions scheduling can be achieved by expanding * idct_helper/transpose_4x4 macros and reordering instructions, * but readability will suffer somewhat. */ #define CONST_BITS 13 #define FIX_0_211164243 (1730) /* FIX(0.211164243) */ #define FIX_0_509795579 (4176) /* FIX(0.509795579) */ #define FIX_0_601344887 (4926) /* FIX(0.601344887) */ #define FIX_0_720959822 (5906) /* FIX(0.720959822) */ #define FIX_0_765366865 (6270) /* FIX(0.765366865) */ #define FIX_0_850430095 (6967) /* FIX(0.850430095) */ #define FIX_0_899976223 (7373) /* FIX(0.899976223) */ #define FIX_1_061594337 (8697) /* FIX(1.061594337) */ #define FIX_1_272758580 (10426) /* FIX(1.272758580) */ #define FIX_1_451774981 (11893) /* FIX(1.451774981) */ #define FIX_1_847759065 (15137) /* FIX(1.847759065) */ #define FIX_2_172734803 (17799) /* FIX(2.172734803) */ #define FIX_2_562915447 (20995) /* FIX(2.562915447) */ #define FIX_3_624509785 (29692) /* FIX(3.624509785) */ .balign 16 jsimd_idct_4x4_neon_consts: .short FIX_1_847759065 /* d0[0] */ .short -FIX_0_765366865 /* d0[1] */ .short -FIX_0_211164243 /* d0[2] */ .short FIX_1_451774981 /* d0[3] */ .short -FIX_2_172734803 /* d1[0] */ .short FIX_1_061594337 /* d1[1] */ .short -FIX_0_509795579 /* d1[2] */ .short -FIX_0_601344887 /* d1[3] */ .short FIX_0_899976223 /* d2[0] */ .short FIX_2_562915447 /* d2[1] */ .short 1 << (CONST_BITS+1) /* d2[2] */ .short 0 /* d2[3] */ .macro idct_helper x4, x6, x8, x10, x12, x14, x16, shift, y26, y27, y28, y29 vmull.s16 q14, \x4, d2[2] vmlal.s16 q14, \x8, d0[0] vmlal.s16 q14, \x14, d0[1] vmull.s16 q13, \x16, d1[2] vmlal.s16 q13, \x12, d1[3] vmlal.s16 q13, \x10, d2[0] vmlal.s16 q13, \x6, d2[1] vmull.s16 q15, \x4, d2[2] vmlsl.s16 q15, \x8, d0[0] vmlsl.s16 q15, \x14, d0[1] vmull.s16 q12, \x16, d0[2] vmlal.s16 q12, \x12, d0[3] vmlal.s16 q12, \x10, d1[0] vmlal.s16 q12, \x6, d1[1] vadd.s32 q10, q14, q13 vsub.s32 q14, q14, q13 .if \shift > 16 vrshr.s32 q10, q10, #\shift vrshr.s32 q14, q14, #\shift vmovn.s32 \y26, q10 vmovn.s32 \y29, q14 .else vrshrn.s32 \y26, q10, #\shift vrshrn.s32 \y29, q14, #\shift .endif vadd.s32 q10, q15, q12 vsub.s32 q15, q15, q12 .if \shift > 16 vrshr.s32 q10, q10, #\shift vrshr.s32 q15, q15, #\shift vmovn.s32 \y27, q10 vmovn.s32 \y28, q15 .else vrshrn.s32 \y27, q10, #\shift vrshrn.s32 \y28, q15, #\shift .endif .endm asm_function jsimd_idct_4x4_neon DCT_TABLE .req r0 COEF_BLOCK .req r1 OUTPUT_BUF .req r2 OUTPUT_COL .req r3 TMP1 .req r0 TMP2 .req r1 TMP3 .req r2 TMP4 .req ip vpush {d8-d15} /* Load constants (d3 is just used for padding) */ adr TMP4, jsimd_idct_4x4_neon_consts vld1.16 {d0, d1, d2, d3}, [TMP4, :128] /* Load all COEF_BLOCK into NEON registers with the following allocation: * 0 1 2 3 | 4 5 6 7 * ---------+-------- * 0 | d4 | d5 * 1 | d6 | d7 * 2 | d8 | d9 * 3 | d10 | d11 * 4 | - | - * 5 | d12 | d13 * 6 | d14 | d15 * 7 | d16 | d17 */ vld1.16 {d4, d5, d6, d7}, [COEF_BLOCK, :128]! vld1.16 {d8, d9, d10, d11}, [COEF_BLOCK, :128]! add COEF_BLOCK, COEF_BLOCK, #16 vld1.16 {d12, d13, d14, d15}, [COEF_BLOCK, :128]! vld1.16 {d16, d17}, [COEF_BLOCK, :128]! /* dequantize */ vld1.16 {d18, d19, d20, d21}, [DCT_TABLE, :128]! vmul.s16 q2, q2, q9 vld1.16 {d22, d23, d24, d25}, [DCT_TABLE, :128]! vmul.s16 q3, q3, q10 vmul.s16 q4, q4, q11 add DCT_TABLE, DCT_TABLE, #16 vld1.16 {d26, d27, d28, d29}, [DCT_TABLE, :128]! vmul.s16 q5, q5, q12 vmul.s16 q6, q6, q13 vld1.16 {d30, d31}, [DCT_TABLE, :128]! vmul.s16 q7, q7, q14 vmul.s16 q8, q8, q15 /* Pass 1 */ idct_helper d4, d6, d8, d10, d12, d14, d16, 12, d4, d6, d8, d10 transpose_4x4 d4, d6, d8, d10 idct_helper d5, d7, d9, d11, d13, d15, d17, 12, d5, d7, d9, d11 transpose_4x4 d5, d7, d9, d11 /* Pass 2 */ idct_helper d4, d6, d8, d10, d7, d9, d11, 19, d26, d27, d28, d29 transpose_4x4 d26, d27, d28, d29 /* Range limit */ vmov.u16 q15, #0x80 vadd.s16 q13, q13, q15 vadd.s16 q14, q14, q15 vqmovun.s16 d26, q13 vqmovun.s16 d27, q14 /* Store results to the output buffer */ ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL add TMP3, TMP3, OUTPUT_COL add TMP4, TMP4, OUTPUT_COL #if defined(__ARMEL__) && !RESPECT_STRICT_ALIGNMENT /* We can use much less instructions on little endian systems if the * OS kernel is not configured to trap unaligned memory accesses */ vst1.32 {d26[0]}, [TMP1]! vst1.32 {d27[0]}, [TMP3]! vst1.32 {d26[1]}, [TMP2]! vst1.32 {d27[1]}, [TMP4]! #else vst1.8 {d26[0]}, [TMP1]! vst1.8 {d27[0]}, [TMP3]! vst1.8 {d26[1]}, [TMP1]! vst1.8 {d27[1]}, [TMP3]! vst1.8 {d26[2]}, [TMP1]! vst1.8 {d27[2]}, [TMP3]! vst1.8 {d26[3]}, [TMP1]! vst1.8 {d27[3]}, [TMP3]! vst1.8 {d26[4]}, [TMP2]! vst1.8 {d27[4]}, [TMP4]! vst1.8 {d26[5]}, [TMP2]! vst1.8 {d27[5]}, [TMP4]! vst1.8 {d26[6]}, [TMP2]! vst1.8 {d27[6]}, [TMP4]! vst1.8 {d26[7]}, [TMP2]! vst1.8 {d27[7]}, [TMP4]! #endif vpop {d8-d15} bx lr .unreq DCT_TABLE .unreq COEF_BLOCK .unreq OUTPUT_BUF .unreq OUTPUT_COL .unreq TMP1 .unreq TMP2 .unreq TMP3 .unreq TMP4 .purgem idct_helper /*****************************************************************************/ /* * jsimd_idct_2x2_neon * * This function contains inverse-DCT code for getting reduced-size * 2x2 pixels output from an 8x8 DCT block. It uses the same calculations * and produces exactly the same output as IJG's original 'jpeg_idct_2x2' * function from jpeg-6b (jidctred.c). * * NOTE: jpeg-8 has an improved implementation of 2x2 inverse-DCT, which * requires much less arithmetic operations and hence should be faster. * The primary purpose of this particular NEON optimized function is * bit exact compatibility with jpeg-6b. */ .balign 8 jsimd_idct_2x2_neon_consts: .short -FIX_0_720959822 /* d0[0] */ .short FIX_0_850430095 /* d0[1] */ .short -FIX_1_272758580 /* d0[2] */ .short FIX_3_624509785 /* d0[3] */ .macro idct_helper x4, x6, x10, x12, x16, shift, y26, y27 vshll.s16 q14, \x4, #15 vmull.s16 q13, \x6, d0[3] vmlal.s16 q13, \x10, d0[2] vmlal.s16 q13, \x12, d0[1] vmlal.s16 q13, \x16, d0[0] vadd.s32 q10, q14, q13 vsub.s32 q14, q14, q13 .if \shift > 16 vrshr.s32 q10, q10, #\shift vrshr.s32 q14, q14, #\shift vmovn.s32 \y26, q10 vmovn.s32 \y27, q14 .else vrshrn.s32 \y26, q10, #\shift vrshrn.s32 \y27, q14, #\shift .endif .endm asm_function jsimd_idct_2x2_neon DCT_TABLE .req r0 COEF_BLOCK .req r1 OUTPUT_BUF .req r2 OUTPUT_COL .req r3 TMP1 .req r0 TMP2 .req ip vpush {d8-d15} /* Load constants */ adr TMP2, jsimd_idct_2x2_neon_consts vld1.16 {d0}, [TMP2, :64] /* Load all COEF_BLOCK into NEON registers with the following allocation: * 0 1 2 3 | 4 5 6 7 * ---------+-------- * 0 | d4 | d5 * 1 | d6 | d7 * 2 | - | - * 3 | d10 | d11 * 4 | - | - * 5 | d12 | d13 * 6 | - | - * 7 | d16 | d17 */ vld1.16 {d4, d5, d6, d7}, [COEF_BLOCK, :128]! add COEF_BLOCK, COEF_BLOCK, #16 vld1.16 {d10, d11}, [COEF_BLOCK, :128]! add COEF_BLOCK, COEF_BLOCK, #16 vld1.16 {d12, d13}, [COEF_BLOCK, :128]! add COEF_BLOCK, COEF_BLOCK, #16 vld1.16 {d16, d17}, [COEF_BLOCK, :128]! /* Dequantize */ vld1.16 {d18, d19, d20, d21}, [DCT_TABLE, :128]! vmul.s16 q2, q2, q9 vmul.s16 q3, q3, q10 add DCT_TABLE, DCT_TABLE, #16 vld1.16 {d24, d25}, [DCT_TABLE, :128]! vmul.s16 q5, q5, q12 add DCT_TABLE, DCT_TABLE, #16 vld1.16 {d26, d27}, [DCT_TABLE, :128]! vmul.s16 q6, q6, q13 add DCT_TABLE, DCT_TABLE, #16 vld1.16 {d30, d31}, [DCT_TABLE, :128]! vmul.s16 q8, q8, q15 /* Pass 1 */ #if 0 idct_helper d4, d6, d10, d12, d16, 13, d4, d6 transpose_4x4 d4, d6, d8, d10 idct_helper d5, d7, d11, d13, d17, 13, d5, d7 transpose_4x4 d5, d7, d9, d11 #else vmull.s16 q13, d6, d0[3] vmlal.s16 q13, d10, d0[2] vmlal.s16 q13, d12, d0[1] vmlal.s16 q13, d16, d0[0] vmull.s16 q12, d7, d0[3] vmlal.s16 q12, d11, d0[2] vmlal.s16 q12, d13, d0[1] vmlal.s16 q12, d17, d0[0] vshll.s16 q14, d4, #15 vshll.s16 q15, d5, #15 vadd.s32 q10, q14, q13 vsub.s32 q14, q14, q13 vrshrn.s32 d4, q10, #13 vrshrn.s32 d6, q14, #13 vadd.s32 q10, q15, q12 vsub.s32 q14, q15, q12 vrshrn.s32 d5, q10, #13 vrshrn.s32 d7, q14, #13 vtrn.16 q2, q3 vtrn.32 q3, q5 #endif /* Pass 2 */ idct_helper d4, d6, d10, d7, d11, 20, d26, d27 /* Range limit */ vmov.u16 q15, #0x80 vadd.s16 q13, q13, q15 vqmovun.s16 d26, q13 vqmovun.s16 d27, q13 /* Store results to the output buffer */ ldmia OUTPUT_BUF, {TMP1, TMP2} add TMP1, TMP1, OUTPUT_COL add TMP2, TMP2, OUTPUT_COL vst1.8 {d26[0]}, [TMP1]! vst1.8 {d27[4]}, [TMP1]! vst1.8 {d26[1]}, [TMP2]! vst1.8 {d27[5]}, [TMP2]! vpop {d8-d15} bx lr .unreq DCT_TABLE .unreq COEF_BLOCK .unreq OUTPUT_BUF .unreq OUTPUT_COL .unreq TMP1 .unreq TMP2 .purgem idct_helper /*****************************************************************************/ /* * jsimd_ycc_extrgb_convert_neon * jsimd_ycc_extbgr_convert_neon * jsimd_ycc_extrgbx_convert_neon * jsimd_ycc_extbgrx_convert_neon * jsimd_ycc_extxbgr_convert_neon * jsimd_ycc_extxrgb_convert_neon * * Colorspace conversion YCbCr -> RGB */ .macro do_load size .if \size == 8 vld1.8 {d4}, [U, :64]! vld1.8 {d5}, [V, :64]! vld1.8 {d0}, [Y, :64]! pld [U, #64] pld [V, #64] pld [Y, #64] .elseif \size == 4 vld1.8 {d4[0]}, [U]! vld1.8 {d4[1]}, [U]! vld1.8 {d4[2]}, [U]! vld1.8 {d4[3]}, [U]! vld1.8 {d5[0]}, [V]! vld1.8 {d5[1]}, [V]! vld1.8 {d5[2]}, [V]! vld1.8 {d5[3]}, [V]! vld1.8 {d0[0]}, [Y]! vld1.8 {d0[1]}, [Y]! vld1.8 {d0[2]}, [Y]! vld1.8 {d0[3]}, [Y]! .elseif \size == 2 vld1.8 {d4[4]}, [U]! vld1.8 {d4[5]}, [U]! vld1.8 {d5[4]}, [V]! vld1.8 {d5[5]}, [V]! vld1.8 {d0[4]}, [Y]! vld1.8 {d0[5]}, [Y]! .elseif \size == 1 vld1.8 {d4[6]}, [U]! vld1.8 {d5[6]}, [V]! vld1.8 {d0[6]}, [Y]! .else .error unsupported macroblock size .endif .endm .macro do_store bpp, size .if \bpp == 24 .if \size == 8 vst3.8 {d10, d11, d12}, [RGB]! .elseif \size == 4 vst3.8 {d10[0], d11[0], d12[0]}, [RGB]! vst3.8 {d10[1], d11[1], d12[1]}, [RGB]! vst3.8 {d10[2], d11[2], d12[2]}, [RGB]! vst3.8 {d10[3], d11[3], d12[3]}, [RGB]! .elseif \size == 2 vst3.8 {d10[4], d11[4], d12[4]}, [RGB]! vst3.8 {d10[5], d11[5], d12[5]}, [RGB]! .elseif \size == 1 vst3.8 {d10[6], d11[6], d12[6]}, [RGB]! .else .error unsupported macroblock size .endif .elseif \bpp == 32 .if \size == 8 vst4.8 {d10, d11, d12, d13}, [RGB]! .elseif \size == 4 vst4.8 {d10[0], d11[0], d12[0], d13[0]}, [RGB]! vst4.8 {d10[1], d11[1], d12[1], d13[1]}, [RGB]! vst4.8 {d10[2], d11[2], d12[2], d13[2]}, [RGB]! vst4.8 {d10[3], d11[3], d12[3], d13[3]}, [RGB]! .elseif \size == 2 vst4.8 {d10[4], d11[4], d12[4], d13[4]}, [RGB]! vst4.8 {d10[5], d11[5], d12[5], d13[5]}, [RGB]! .elseif \size == 1 vst4.8 {d10[6], d11[6], d12[6], d13[6]}, [RGB]! .else .error unsupported macroblock size .endif .elseif \bpp == 16 .if \size == 8 vst1.16 {q15}, [RGB]! .elseif \size == 4 vst1.16 {d30}, [RGB]! .elseif \size == 2 vst1.16 {d31[0]}, [RGB]! vst1.16 {d31[1]}, [RGB]! .elseif \size == 1 vst1.16 {d31[2]}, [RGB]! .else .error unsupported macroblock size .endif .else .error unsupported bpp .endif .endm .macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, g_offs, b_offs /* * 2-stage pipelined YCbCr->RGB conversion */ .macro do_yuv_to_rgb_stage1 vaddw.u8 q3, q1, d4 /* q3 = u - 128 */ vaddw.u8 q4, q1, d5 /* q2 = v - 128 */ vmull.s16 q10, d6, d1[1] /* multiply by -11277 */ vmlal.s16 q10, d8, d1[2] /* multiply by -23401 */ vmull.s16 q11, d7, d1[1] /* multiply by -11277 */ vmlal.s16 q11, d9, d1[2] /* multiply by -23401 */ vmull.s16 q12, d8, d1[0] /* multiply by 22971 */ vmull.s16 q13, d9, d1[0] /* multiply by 22971 */ vmull.s16 q14, d6, d1[3] /* multiply by 29033 */ vmull.s16 q15, d7, d1[3] /* multiply by 29033 */ .endm .macro do_yuv_to_rgb_stage2 vrshrn.s32 d20, q10, #15 vrshrn.s32 d21, q11, #15 vrshrn.s32 d24, q12, #14 vrshrn.s32 d25, q13, #14 vrshrn.s32 d28, q14, #14 vrshrn.s32 d29, q15, #14 vaddw.u8 q11, q10, d0 vaddw.u8 q12, q12, d0 vaddw.u8 q14, q14, d0 .if \bpp != 16 vqmovun.s16 d1\g_offs, q11 vqmovun.s16 d1\r_offs, q12 vqmovun.s16 d1\b_offs, q14 .else /* rgb565 */ vqshlu.s16 q13, q11, #8 vqshlu.s16 q15, q12, #8 vqshlu.s16 q14, q14, #8 vsri.u16 q15, q13, #5 vsri.u16 q15, q14, #11 .endif .endm .macro do_yuv_to_rgb_stage2_store_load_stage1 /* "do_yuv_to_rgb_stage2" and "store" */ vrshrn.s32 d20, q10, #15 /* "load" and "do_yuv_to_rgb_stage1" */ pld [U, #64] vrshrn.s32 d21, q11, #15 pld [V, #64] vrshrn.s32 d24, q12, #14 vrshrn.s32 d25, q13, #14 vld1.8 {d4}, [U, :64]! vrshrn.s32 d28, q14, #14 vld1.8 {d5}, [V, :64]! vrshrn.s32 d29, q15, #14 vaddw.u8 q3, q1, d4 /* q3 = u - 128 */ vaddw.u8 q4, q1, d5 /* q2 = v - 128 */ vaddw.u8 q11, q10, d0 vmull.s16 q10, d6, d1[1] /* multiply by -11277 */ vmlal.s16 q10, d8, d1[2] /* multiply by -23401 */ vaddw.u8 q12, q12, d0 vaddw.u8 q14, q14, d0 .if \bpp != 16 /**************** rgb24/rgb32 ******************************/ vqmovun.s16 d1\g_offs, q11 pld [Y, #64] vqmovun.s16 d1\r_offs, q12 vld1.8 {d0}, [Y, :64]! vqmovun.s16 d1\b_offs, q14 vmull.s16 q11, d7, d1[1] /* multiply by -11277 */ vmlal.s16 q11, d9, d1[2] /* multiply by -23401 */ do_store \bpp, 8 vmull.s16 q12, d8, d1[0] /* multiply by 22971 */ vmull.s16 q13, d9, d1[0] /* multiply by 22971 */ vmull.s16 q14, d6, d1[3] /* multiply by 29033 */ vmull.s16 q15, d7, d1[3] /* multiply by 29033 */ .else /**************************** rgb565 ********************************/ vqshlu.s16 q13, q11, #8 pld [Y, #64] vqshlu.s16 q15, q12, #8 vqshlu.s16 q14, q14, #8 vld1.8 {d0}, [Y, :64]! vmull.s16 q11, d7, d1[1] vmlal.s16 q11, d9, d1[2] vsri.u16 q15, q13, #5 vmull.s16 q12, d8, d1[0] vsri.u16 q15, q14, #11 vmull.s16 q13, d9, d1[0] vmull.s16 q14, d6, d1[3] do_store \bpp, 8 vmull.s16 q15, d7, d1[3] .endif .endm .macro do_yuv_to_rgb do_yuv_to_rgb_stage1 do_yuv_to_rgb_stage2 .endm /* Apple gas crashes on adrl, work around that by using adr. * But this requires a copy of these constants for each function. */ .balign 16 jsimd_ycc_\colorid\()_neon_consts: .short 0, 0, 0, 0 .short 22971, -11277, -23401, 29033 .short -128, -128, -128, -128 .short -128, -128, -128, -128 asm_function jsimd_ycc_\colorid\()_convert_neon OUTPUT_WIDTH .req r0 INPUT_BUF .req r1 INPUT_ROW .req r2 OUTPUT_BUF .req r3 NUM_ROWS .req r4 INPUT_BUF0 .req r5 INPUT_BUF1 .req r6 INPUT_BUF2 .req INPUT_BUF RGB .req r7 Y .req r8 U .req r9 V .req r10 N .req ip /* Load constants to d1, d2, d3 (d0 is just used for padding) */ adr ip, jsimd_ycc_\colorid\()_neon_consts vld1.16 {d0, d1, d2, d3}, [ip, :128] /* Save ARM registers and handle input arguments */ push {r4, r5, r6, r7, r8, r9, r10, lr} ldr NUM_ROWS, [sp, #(4 * 8)] ldr INPUT_BUF0, [INPUT_BUF] ldr INPUT_BUF1, [INPUT_BUF, #4] ldr INPUT_BUF2, [INPUT_BUF, #8] .unreq INPUT_BUF /* Save NEON registers */ vpush {d8-d15} /* Initially set d10, d11, d12, d13 to 0xFF */ vmov.u8 q5, #255 vmov.u8 q6, #255 /* Outer loop over scanlines */ cmp NUM_ROWS, #1 blt 9f 0: ldr Y, [INPUT_BUF0, INPUT_ROW, lsl #2] ldr U, [INPUT_BUF1, INPUT_ROW, lsl #2] mov N, OUTPUT_WIDTH ldr V, [INPUT_BUF2, INPUT_ROW, lsl #2] add INPUT_ROW, INPUT_ROW, #1 ldr RGB, [OUTPUT_BUF], #4 /* Inner loop over pixels */ subs N, N, #8 blt 3f do_load 8 do_yuv_to_rgb_stage1 subs N, N, #8 blt 2f 1: do_yuv_to_rgb_stage2_store_load_stage1 subs N, N, #8 bge 1b 2: do_yuv_to_rgb_stage2 do_store \bpp, 8 tst N, #7 beq 8f 3: tst N, #4 beq 3f do_load 4 3: tst N, #2 beq 4f do_load 2 4: tst N, #1 beq 5f do_load 1 5: do_yuv_to_rgb tst N, #4 beq 6f do_store \bpp, 4 6: tst N, #2 beq 7f do_store \bpp, 2 7: tst N, #1 beq 8f do_store \bpp, 1 8: subs NUM_ROWS, NUM_ROWS, #1 bgt 0b 9: /* Restore all registers and return */ vpop {d8-d15} pop {r4, r5, r6, r7, r8, r9, r10, pc} .unreq OUTPUT_WIDTH .unreq INPUT_ROW .unreq OUTPUT_BUF .unreq NUM_ROWS .unreq INPUT_BUF0 .unreq INPUT_BUF1 .unreq INPUT_BUF2 .unreq RGB .unreq Y .unreq U .unreq V .unreq N .purgem do_yuv_to_rgb .purgem do_yuv_to_rgb_stage1 .purgem do_yuv_to_rgb_stage2 .purgem do_yuv_to_rgb_stage2_store_load_stage1 .endm /*--------------------------------- id ----- bpp R G B */ generate_jsimd_ycc_rgb_convert_neon extrgb, 24, 0, 1, 2 generate_jsimd_ycc_rgb_convert_neon extbgr, 24, 2, 1, 0 generate_jsimd_ycc_rgb_convert_neon extrgbx, 32, 0, 1, 2 generate_jsimd_ycc_rgb_convert_neon extbgrx, 32, 2, 1, 0 generate_jsimd_ycc_rgb_convert_neon extxbgr, 32, 3, 2, 1 generate_jsimd_ycc_rgb_convert_neon extxrgb, 32, 1, 2, 3 generate_jsimd_ycc_rgb_convert_neon rgb565, 16, 0, 0, 0 .purgem do_load .purgem do_store /*****************************************************************************/ /* * jsimd_extrgb_ycc_convert_neon * jsimd_extbgr_ycc_convert_neon * jsimd_extrgbx_ycc_convert_neon * jsimd_extbgrx_ycc_convert_neon * jsimd_extxbgr_ycc_convert_neon * jsimd_extxrgb_ycc_convert_neon * * Colorspace conversion RGB -> YCbCr */ .macro do_store size .if \size == 8 vst1.8 {d20}, [Y]! vst1.8 {d21}, [U]! vst1.8 {d22}, [V]! .elseif \size == 4 vst1.8 {d20[0]}, [Y]! vst1.8 {d20[1]}, [Y]! vst1.8 {d20[2]}, [Y]! vst1.8 {d20[3]}, [Y]! vst1.8 {d21[0]}, [U]! vst1.8 {d21[1]}, [U]! vst1.8 {d21[2]}, [U]! vst1.8 {d21[3]}, [U]! vst1.8 {d22[0]}, [V]! vst1.8 {d22[1]}, [V]! vst1.8 {d22[2]}, [V]! vst1.8 {d22[3]}, [V]! .elseif \size == 2 vst1.8 {d20[4]}, [Y]! vst1.8 {d20[5]}, [Y]! vst1.8 {d21[4]}, [U]! vst1.8 {d21[5]}, [U]! vst1.8 {d22[4]}, [V]! vst1.8 {d22[5]}, [V]! .elseif \size == 1 vst1.8 {d20[6]}, [Y]! vst1.8 {d21[6]}, [U]! vst1.8 {d22[6]}, [V]! .else .error unsupported macroblock size .endif .endm .macro do_load bpp, size .if \bpp == 24 .if \size == 8 vld3.8 {d10, d11, d12}, [RGB]! pld [RGB, #128] .elseif \size == 4 vld3.8 {d10[0], d11[0], d12[0]}, [RGB]! vld3.8 {d10[1], d11[1], d12[1]}, [RGB]! vld3.8 {d10[2], d11[2], d12[2]}, [RGB]! vld3.8 {d10[3], d11[3], d12[3]}, [RGB]! .elseif \size == 2 vld3.8 {d10[4], d11[4], d12[4]}, [RGB]! vld3.8 {d10[5], d11[5], d12[5]}, [RGB]! .elseif \size == 1 vld3.8 {d10[6], d11[6], d12[6]}, [RGB]! .else .error unsupported macroblock size .endif .elseif \bpp == 32 .if \size == 8 vld4.8 {d10, d11, d12, d13}, [RGB]! pld [RGB, #128] .elseif \size == 4 vld4.8 {d10[0], d11[0], d12[0], d13[0]}, [RGB]! vld4.8 {d10[1], d11[1], d12[1], d13[1]}, [RGB]! vld4.8 {d10[2], d11[2], d12[2], d13[2]}, [RGB]! vld4.8 {d10[3], d11[3], d12[3], d13[3]}, [RGB]! .elseif \size == 2 vld4.8 {d10[4], d11[4], d12[4], d13[4]}, [RGB]! vld4.8 {d10[5], d11[5], d12[5], d13[5]}, [RGB]! .elseif \size == 1 vld4.8 {d10[6], d11[6], d12[6], d13[6]}, [RGB]! .else .error unsupported macroblock size .endif .else .error unsupported bpp .endif .endm .macro generate_jsimd_rgb_ycc_convert_neon colorid, bpp, r_offs, g_offs, b_offs /* * 2-stage pipelined RGB->YCbCr conversion */ .macro do_rgb_to_yuv_stage1 vmovl.u8 q2, d1\r_offs /* r = { d4, d5 } */ vmovl.u8 q3, d1\g_offs /* g = { d6, d7 } */ vmovl.u8 q4, d1\b_offs /* b = { d8, d9 } */ vmull.u16 q7, d4, d0[0] vmlal.u16 q7, d6, d0[1] vmlal.u16 q7, d8, d0[2] vmull.u16 q8, d5, d0[0] vmlal.u16 q8, d7, d0[1] vmlal.u16 q8, d9, d0[2] vrev64.32 q9, q1 vrev64.32 q13, q1 vmlsl.u16 q9, d4, d0[3] vmlsl.u16 q9, d6, d1[0] vmlal.u16 q9, d8, d1[1] vmlsl.u16 q13, d5, d0[3] vmlsl.u16 q13, d7, d1[0] vmlal.u16 q13, d9, d1[1] vrev64.32 q14, q1 vrev64.32 q15, q1 vmlal.u16 q14, d4, d1[1] vmlsl.u16 q14, d6, d1[2] vmlsl.u16 q14, d8, d1[3] vmlal.u16 q15, d5, d1[1] vmlsl.u16 q15, d7, d1[2] vmlsl.u16 q15, d9, d1[3] .endm .macro do_rgb_to_yuv_stage2 vrshrn.u32 d20, q7, #16 vrshrn.u32 d21, q8, #16 vshrn.u32 d22, q9, #16 vshrn.u32 d23, q13, #16 vshrn.u32 d24, q14, #16 vshrn.u32 d25, q15, #16 vmovn.u16 d20, q10 /* d20 = y */ vmovn.u16 d21, q11 /* d21 = u */ vmovn.u16 d22, q12 /* d22 = v */ .endm .macro do_rgb_to_yuv do_rgb_to_yuv_stage1 do_rgb_to_yuv_stage2 .endm .macro do_rgb_to_yuv_stage2_store_load_stage1 vrshrn.u32 d20, q7, #16 vrshrn.u32 d21, q8, #16 vshrn.u32 d22, q9, #16 vrev64.32 q9, q1 vshrn.u32 d23, q13, #16 vrev64.32 q13, q1 vshrn.u32 d24, q14, #16 vshrn.u32 d25, q15, #16 do_load \bpp, 8 vmovn.u16 d20, q10 /* d20 = y */ vmovl.u8 q2, d1\r_offs /* r = { d4, d5 } */ vmovn.u16 d21, q11 /* d21 = u */ vmovl.u8 q3, d1\g_offs /* g = { d6, d7 } */ vmovn.u16 d22, q12 /* d22 = v */ vmovl.u8 q4, d1\b_offs /* b = { d8, d9 } */ vmull.u16 q7, d4, d0[0] vmlal.u16 q7, d6, d0[1] vmlal.u16 q7, d8, d0[2] vst1.8 {d20}, [Y]! vmull.u16 q8, d5, d0[0] vmlal.u16 q8, d7, d0[1] vmlal.u16 q8, d9, d0[2] vmlsl.u16 q9, d4, d0[3] vmlsl.u16 q9, d6, d1[0] vmlal.u16 q9, d8, d1[1] vst1.8 {d21}, [U]! vmlsl.u16 q13, d5, d0[3] vmlsl.u16 q13, d7, d1[0] vmlal.u16 q13, d9, d1[1] vrev64.32 q14, q1 vrev64.32 q15, q1 vmlal.u16 q14, d4, d1[1] vmlsl.u16 q14, d6, d1[2] vmlsl.u16 q14, d8, d1[3] vst1.8 {d22}, [V]! vmlal.u16 q15, d5, d1[1] vmlsl.u16 q15, d7, d1[2] vmlsl.u16 q15, d9, d1[3] .endm .balign 16 jsimd_\colorid\()_ycc_neon_consts: .short 19595, 38470, 7471, 11059 .short 21709, 32768, 27439, 5329 .short 32767, 128, 32767, 128 .short 32767, 128, 32767, 128 asm_function jsimd_\colorid\()_ycc_convert_neon OUTPUT_WIDTH .req r0 INPUT_BUF .req r1 OUTPUT_BUF .req r2 OUTPUT_ROW .req r3 NUM_ROWS .req r4 OUTPUT_BUF0 .req r5 OUTPUT_BUF1 .req r6 OUTPUT_BUF2 .req OUTPUT_BUF RGB .req r7 Y .req r8 U .req r9 V .req r10 N .req ip /* Load constants to d0, d1, d2, d3 */ adr ip, jsimd_\colorid\()_ycc_neon_consts vld1.16 {d0, d1, d2, d3}, [ip, :128] /* Save ARM registers and handle input arguments */ push {r4, r5, r6, r7, r8, r9, r10, lr} ldr NUM_ROWS, [sp, #(4 * 8)] ldr OUTPUT_BUF0, [OUTPUT_BUF] ldr OUTPUT_BUF1, [OUTPUT_BUF, #4] ldr OUTPUT_BUF2, [OUTPUT_BUF, #8] .unreq OUTPUT_BUF /* Save NEON registers */ vpush {d8-d15} /* Outer loop over scanlines */ cmp NUM_ROWS, #1 blt 9f 0: ldr Y, [OUTPUT_BUF0, OUTPUT_ROW, lsl #2] ldr U, [OUTPUT_BUF1, OUTPUT_ROW, lsl #2] mov N, OUTPUT_WIDTH ldr V, [OUTPUT_BUF2, OUTPUT_ROW, lsl #2] add OUTPUT_ROW, OUTPUT_ROW, #1 ldr RGB, [INPUT_BUF], #4 /* Inner loop over pixels */ subs N, N, #8 blt 3f do_load \bpp, 8 do_rgb_to_yuv_stage1 subs N, N, #8 blt 2f 1: do_rgb_to_yuv_stage2_store_load_stage1 subs N, N, #8 bge 1b 2: do_rgb_to_yuv_stage2 do_store 8 tst N, #7 beq 8f 3: tst N, #4 beq 3f do_load \bpp, 4 3: tst N, #2 beq 4f do_load \bpp, 2 4: tst N, #1 beq 5f do_load \bpp, 1 5: do_rgb_to_yuv tst N, #4 beq 6f do_store 4 6: tst N, #2 beq 7f do_store 2 7: tst N, #1 beq 8f do_store 1 8: subs NUM_ROWS, NUM_ROWS, #1 bgt 0b 9: /* Restore all registers and return */ vpop {d8-d15} pop {r4, r5, r6, r7, r8, r9, r10, pc} .unreq OUTPUT_WIDTH .unreq OUTPUT_ROW .unreq INPUT_BUF .unreq NUM_ROWS .unreq OUTPUT_BUF0 .unreq OUTPUT_BUF1 .unreq OUTPUT_BUF2 .unreq RGB .unreq Y .unreq U .unreq V .unreq N .purgem do_rgb_to_yuv .purgem do_rgb_to_yuv_stage1 .purgem do_rgb_to_yuv_stage2 .purgem do_rgb_to_yuv_stage2_store_load_stage1 .endm /*--------------------------------- id ----- bpp R G B */ generate_jsimd_rgb_ycc_convert_neon extrgb, 24, 0, 1, 2 generate_jsimd_rgb_ycc_convert_neon extbgr, 24, 2, 1, 0 generate_jsimd_rgb_ycc_convert_neon extrgbx, 32, 0, 1, 2 generate_jsimd_rgb_ycc_convert_neon extbgrx, 32, 2, 1, 0 generate_jsimd_rgb_ycc_convert_neon extxbgr, 32, 3, 2, 1 generate_jsimd_rgb_ycc_convert_neon extxrgb, 32, 1, 2, 3 .purgem do_load .purgem do_store /*****************************************************************************/ /* * Load data into workspace, applying unsigned->signed conversion * * TODO: can be combined with 'jsimd_fdct_ifast_neon' to get * rid of VST1.16 instructions */ asm_function jsimd_convsamp_neon SAMPLE_DATA .req r0 START_COL .req r1 WORKSPACE .req r2 TMP1 .req r3 TMP2 .req r4 TMP3 .req r5 TMP4 .req ip push {r4, r5} vmov.u8 d0, #128 ldmia SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4} add TMP1, TMP1, START_COL add TMP2, TMP2, START_COL add TMP3, TMP3, START_COL add TMP4, TMP4, START_COL vld1.8 {d16}, [TMP1] vsubl.u8 q8, d16, d0 vld1.8 {d18}, [TMP2] vsubl.u8 q9, d18, d0 vld1.8 {d20}, [TMP3] vsubl.u8 q10, d20, d0 vld1.8 {d22}, [TMP4] ldmia SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4} vsubl.u8 q11, d22, d0 vst1.16 {d16, d17, d18, d19}, [WORKSPACE, :128]! add TMP1, TMP1, START_COL add TMP2, TMP2, START_COL vst1.16 {d20, d21, d22, d23}, [WORKSPACE, :128]! add TMP3, TMP3, START_COL add TMP4, TMP4, START_COL vld1.8 {d24}, [TMP1] vsubl.u8 q12, d24, d0 vld1.8 {d26}, [TMP2] vsubl.u8 q13, d26, d0 vld1.8 {d28}, [TMP3] vsubl.u8 q14, d28, d0 vld1.8 {d30}, [TMP4] vsubl.u8 q15, d30, d0 vst1.16 {d24, d25, d26, d27}, [WORKSPACE, :128]! vst1.16 {d28, d29, d30, d31}, [WORKSPACE, :128]! pop {r4, r5} bx lr .unreq SAMPLE_DATA .unreq START_COL .unreq WORKSPACE .unreq TMP1 .unreq TMP2 .unreq TMP3 .unreq TMP4 /*****************************************************************************/ /* * jsimd_fdct_ifast_neon * * This function contains a fast, not so accurate integer implementation of * the forward DCT (Discrete Cosine Transform). It uses the same calculations * and produces exactly the same output as IJG's original 'jpeg_fdct_ifast' * function from jfdctfst.c * * TODO: can be combined with 'jsimd_convsamp_neon' to get * rid of a bunch of VLD1.16 instructions */ #define XFIX_0_382683433 d0[0] #define XFIX_0_541196100 d0[1] #define XFIX_0_707106781 d0[2] #define XFIX_1_306562965 d0[3] .balign 16 jsimd_fdct_ifast_neon_consts: .short (98 * 128) /* XFIX_0_382683433 */ .short (139 * 128) /* XFIX_0_541196100 */ .short (181 * 128) /* XFIX_0_707106781 */ .short (334 * 128 - 256 * 128) /* XFIX_1_306562965 */ asm_function jsimd_fdct_ifast_neon DATA .req r0 TMP .req ip vpush {d8-d15} /* Load constants */ adr TMP, jsimd_fdct_ifast_neon_consts vld1.16 {d0}, [TMP, :64] /* Load all DATA into NEON registers with the following allocation: * 0 1 2 3 | 4 5 6 7 * ---------+-------- * 0 | d16 | d17 | q8 * 1 | d18 | d19 | q9 * 2 | d20 | d21 | q10 * 3 | d22 | d23 | q11 * 4 | d24 | d25 | q12 * 5 | d26 | d27 | q13 * 6 | d28 | d29 | q14 * 7 | d30 | d31 | q15 */ vld1.16 {d16, d17, d18, d19}, [DATA, :128]! vld1.16 {d20, d21, d22, d23}, [DATA, :128]! vld1.16 {d24, d25, d26, d27}, [DATA, :128]! vld1.16 {d28, d29, d30, d31}, [DATA, :128] sub DATA, DATA, #(128 - 32) mov TMP, #2 1: /* Transpose */ vtrn.16 q12, q13 vtrn.16 q10, q11 vtrn.16 q8, q9 vtrn.16 q14, q15 vtrn.32 q9, q11 vtrn.32 q13, q15 vtrn.32 q8, q10 vtrn.32 q12, q14 vswp d30, d23 vswp d24, d17 vswp d26, d19 /* 1-D FDCT */ vadd.s16 q2, q11, q12 vswp d28, d21 vsub.s16 q12, q11, q12 vsub.s16 q6, q10, q13 vadd.s16 q10, q10, q13 vsub.s16 q7, q9, q14 vadd.s16 q9, q9, q14 vsub.s16 q1, q8, q15 vadd.s16 q8, q8, q15 vsub.s16 q4, q9, q10 vsub.s16 q5, q8, q2 vadd.s16 q3, q9, q10 vadd.s16 q4, q4, q5 vadd.s16 q2, q8, q2 vqdmulh.s16 q4, q4, XFIX_0_707106781 vadd.s16 q11, q12, q6 vadd.s16 q8, q2, q3 vsub.s16 q12, q2, q3 vadd.s16 q3, q6, q7 vadd.s16 q7, q7, q1 vqdmulh.s16 q3, q3, XFIX_0_707106781 vsub.s16 q6, q11, q7 vadd.s16 q10, q5, q4 vqdmulh.s16 q6, q6, XFIX_0_382683433 vsub.s16 q14, q5, q4 vqdmulh.s16 q11, q11, XFIX_0_541196100 vqdmulh.s16 q5, q7, XFIX_1_306562965 vadd.s16 q4, q1, q3 vsub.s16 q3, q1, q3 vadd.s16 q7, q7, q6 vadd.s16 q11, q11, q6 vadd.s16 q7, q7, q5 vadd.s16 q13, q3, q11 vsub.s16 q11, q3, q11 vadd.s16 q9, q4, q7 vsub.s16 q15, q4, q7 subs TMP, TMP, #1 bne 1b /* store results */ vst1.16 {d16, d17, d18, d19}, [DATA, :128]! vst1.16 {d20, d21, d22, d23}, [DATA, :128]! vst1.16 {d24, d25, d26, d27}, [DATA, :128]! vst1.16 {d28, d29, d30, d31}, [DATA, :128] vpop {d8-d15} bx lr .unreq DATA .unreq TMP /*****************************************************************************/ /* * GLOBAL(void) * jsimd_quantize_neon (JCOEFPTR coef_block, DCTELEM *divisors, * DCTELEM *workspace); * * Note: the code uses 2 stage pipelining in order to improve instructions * scheduling and eliminate stalls (this provides ~15% better * performance for this function on both ARM Cortex-A8 and * ARM Cortex-A9 when compared to the non-pipelined variant). * The instructions which belong to the second stage use different * indentation for better readiability. */ asm_function jsimd_quantize_neon COEF_BLOCK .req r0 DIVISORS .req r1 WORKSPACE .req r2 RECIPROCAL .req DIVISORS CORRECTION .req r3 SHIFT .req ip LOOP_COUNT .req r4 vld1.16 {d0, d1, d2, d3}, [WORKSPACE, :128]! vabs.s16 q12, q0 add CORRECTION, DIVISORS, #(64 * 2) add SHIFT, DIVISORS, #(64 * 6) vld1.16 {d20, d21, d22, d23}, [CORRECTION, :128]! vabs.s16 q13, q1 vld1.16 {d16, d17, d18, d19}, [RECIPROCAL, :128]! vadd.u16 q12, q12, q10 /* add correction */ vadd.u16 q13, q13, q11 vmull.u16 q10, d24, d16 /* multiply by reciprocal */ vmull.u16 q11, d25, d17 vmull.u16 q8, d26, d18 vmull.u16 q9, d27, d19 vld1.16 {d24, d25, d26, d27}, [SHIFT, :128]! vshrn.u32 d20, q10, #16 vshrn.u32 d21, q11, #16 vshrn.u32 d22, q8, #16 vshrn.u32 d23, q9, #16 vneg.s16 q12, q12 vneg.s16 q13, q13 vshr.s16 q2, q0, #15 /* extract sign */ vshr.s16 q3, q1, #15 vshl.u16 q14, q10, q12 /* shift */ vshl.u16 q15, q11, q13 push {r4, r5} mov LOOP_COUNT, #3 1: vld1.16 {d0, d1, d2, d3}, [WORKSPACE, :128]! veor.u16 q14, q14, q2 /* restore sign */ vabs.s16 q12, q0 vld1.16 {d20, d21, d22, d23}, [CORRECTION, :128]! vabs.s16 q13, q1 veor.u16 q15, q15, q3 vld1.16 {d16, d17, d18, d19}, [RECIPROCAL, :128]! vadd.u16 q12, q12, q10 /* add correction */ vadd.u16 q13, q13, q11 vmull.u16 q10, d24, d16 /* multiply by reciprocal */ vmull.u16 q11, d25, d17 vmull.u16 q8, d26, d18 vmull.u16 q9, d27, d19 vsub.u16 q14, q14, q2 vld1.16 {d24, d25, d26, d27}, [SHIFT, :128]! vsub.u16 q15, q15, q3 vshrn.u32 d20, q10, #16 vshrn.u32 d21, q11, #16 vst1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]! vshrn.u32 d22, q8, #16 vshrn.u32 d23, q9, #16 vneg.s16 q12, q12 vneg.s16 q13, q13 vshr.s16 q2, q0, #15 /* extract sign */ vshr.s16 q3, q1, #15 vshl.u16 q14, q10, q12 /* shift */ vshl.u16 q15, q11, q13 subs LOOP_COUNT, LOOP_COUNT, #1 bne 1b pop {r4, r5} veor.u16 q14, q14, q2 /* restore sign */ veor.u16 q15, q15, q3 vsub.u16 q14, q14, q2 vsub.u16 q15, q15, q3 vst1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]! bx lr /* return */ .unreq COEF_BLOCK .unreq DIVISORS .unreq WORKSPACE .unreq RECIPROCAL .unreq CORRECTION .unreq SHIFT .unreq LOOP_COUNT /*****************************************************************************/ /* * GLOBAL(void) * jsimd_h2v1_fancy_upsample_neon (int max_v_samp_factor, * JDIMENSION downsampled_width, * JSAMPARRAY input_data, * JSAMPARRAY *output_data_ptr); * * Note: the use of unaligned writes is the main remaining bottleneck in * this code, which can be potentially solved to get up to tens * of percents performance improvement on Cortex-A8/Cortex-A9. */ /* * Upsample 16 source pixels to 32 destination pixels. The new 16 source * pixels are loaded to q0. The previous 16 source pixels are in q1. The * shifted-by-one source pixels are constructed in q2 by using q0 and q1. * Register d28 is used for multiplication by 3. Register q15 is used * for adding +1 bias. */ .macro upsample16 OUTPTR, INPTR vld1.8 {q0}, [\INPTR]! vmovl.u8 q8, d0 vext.8 q2, q1, q0, #15 vmovl.u8 q9, d1 vaddw.u8 q10, q15, d4 vaddw.u8 q11, q15, d5 vmlal.u8 q8, d4, d28 vmlal.u8 q9, d5, d28 vmlal.u8 q10, d0, d28 vmlal.u8 q11, d1, d28 vmov q1, q0 /* backup source pixels to q1 */ vrshrn.u16 d6, q8, #2 vrshrn.u16 d7, q9, #2 vshrn.u16 d8, q10, #2 vshrn.u16 d9, q11, #2 vst2.8 {d6, d7, d8, d9}, [\OUTPTR]! .endm /* * Upsample 32 source pixels to 64 destination pixels. Compared to 'usample16' * macro, the roles of q0 and q1 registers are reversed for even and odd * groups of 16 pixels, that's why "vmov q1, q0" instructions are not needed. * Also this unrolling allows to reorder loads and stores to compensate * multiplication latency and reduce stalls. */ .macro upsample32 OUTPTR, INPTR /* even 16 pixels group */ vld1.8 {q0}, [\INPTR]! vmovl.u8 q8, d0 vext.8 q2, q1, q0, #15 vmovl.u8 q9, d1 vaddw.u8 q10, q15, d4 vaddw.u8 q11, q15, d5 vmlal.u8 q8, d4, d28 vmlal.u8 q9, d5, d28 vmlal.u8 q10, d0, d28 vmlal.u8 q11, d1, d28 /* odd 16 pixels group */ vld1.8 {q1}, [\INPTR]! vrshrn.u16 d6, q8, #2 vrshrn.u16 d7, q9, #2 vshrn.u16 d8, q10, #2 vshrn.u16 d9, q11, #2 vmovl.u8 q8, d2 vext.8 q2, q0, q1, #15 vmovl.u8 q9, d3 vaddw.u8 q10, q15, d4 vaddw.u8 q11, q15, d5 vmlal.u8 q8, d4, d28 vmlal.u8 q9, d5, d28 vmlal.u8 q10, d2, d28 vmlal.u8 q11, d3, d28 vst2.8 {d6, d7, d8, d9}, [\OUTPTR]! vrshrn.u16 d6, q8, #2 vrshrn.u16 d7, q9, #2 vshrn.u16 d8, q10, #2 vshrn.u16 d9, q11, #2 vst2.8 {d6, d7, d8, d9}, [\OUTPTR]! .endm /* * Upsample a row of WIDTH pixels from INPTR to OUTPTR. */ .macro upsample_row OUTPTR, INPTR, WIDTH, TMP1 /* special case for the first and last pixels */ sub \WIDTH, \WIDTH, #1 add \OUTPTR, \OUTPTR, #1 ldrb \TMP1, [\INPTR, \WIDTH] strb \TMP1, [\OUTPTR, \WIDTH, asl #1] ldrb \TMP1, [\INPTR], #1 strb \TMP1, [\OUTPTR, #-1] vmov.8 d3[7], \TMP1 subs \WIDTH, \WIDTH, #32 blt 5f 0: /* process 32 pixels per iteration */ upsample32 \OUTPTR, \INPTR subs \WIDTH, \WIDTH, #32 bge 0b 5: adds \WIDTH, \WIDTH, #16 blt 1f 0: /* process 16 pixels if needed */ upsample16 \OUTPTR, \INPTR subs \WIDTH, \WIDTH, #16 1: adds \WIDTH, \WIDTH, #16 beq 9f /* load the remaining 1-15 pixels */ add \INPTR, \INPTR, \WIDTH tst \WIDTH, #1 beq 2f sub \INPTR, \INPTR, #1 vld1.8 {d0[0]}, [\INPTR] 2: tst \WIDTH, #2 beq 2f vext.8 d0, d0, d0, #6 sub \INPTR, \INPTR, #1 vld1.8 {d0[1]}, [\INPTR] sub \INPTR, \INPTR, #1 vld1.8 {d0[0]}, [\INPTR] 2: tst \WIDTH, #4 beq 2f vrev64.32 d0, d0 sub \INPTR, \INPTR, #1 vld1.8 {d0[3]}, [\INPTR] sub \INPTR, \INPTR, #1 vld1.8 {d0[2]}, [\INPTR] sub \INPTR, \INPTR, #1 vld1.8 {d0[1]}, [\INPTR] sub \INPTR, \INPTR, #1 vld1.8 {d0[0]}, [\INPTR] 2: tst \WIDTH, #8 beq 2f vmov d1, d0 sub \INPTR, \INPTR, #8 vld1.8 {d0}, [\INPTR] 2: /* upsample the remaining pixels */ vmovl.u8 q8, d0 vext.8 q2, q1, q0, #15 vmovl.u8 q9, d1 vaddw.u8 q10, q15, d4 vaddw.u8 q11, q15, d5 vmlal.u8 q8, d4, d28 vmlal.u8 q9, d5, d28 vmlal.u8 q10, d0, d28 vmlal.u8 q11, d1, d28 vrshrn.u16 d10, q8, #2 vrshrn.u16 d12, q9, #2 vshrn.u16 d11, q10, #2 vshrn.u16 d13, q11, #2 vzip.8 d10, d11 vzip.8 d12, d13 /* store the remaining pixels */ tst \WIDTH, #8 beq 2f vst1.8 {d10, d11}, [\OUTPTR]! vmov q5, q6 2: tst \WIDTH, #4 beq 2f vst1.8 {d10}, [\OUTPTR]! vmov d10, d11 2: tst \WIDTH, #2 beq 2f vst1.8 {d10[0]}, [\OUTPTR]! vst1.8 {d10[1]}, [\OUTPTR]! vst1.8 {d10[2]}, [\OUTPTR]! vst1.8 {d10[3]}, [\OUTPTR]! vext.8 d10, d10, d10, #4 2: tst \WIDTH, #1 beq 2f vst1.8 {d10[0]}, [\OUTPTR]! vst1.8 {d10[1]}, [\OUTPTR]! 2: 9: .endm asm_function jsimd_h2v1_fancy_upsample_neon MAX_V_SAMP_FACTOR .req r0 DOWNSAMPLED_WIDTH .req r1 INPUT_DATA .req r2 OUTPUT_DATA_PTR .req r3 OUTPUT_DATA .req OUTPUT_DATA_PTR OUTPTR .req r4 INPTR .req r5 WIDTH .req ip TMP .req lr push {r4, r5, r6, lr} vpush {d8-d15} ldr OUTPUT_DATA, [OUTPUT_DATA_PTR] cmp MAX_V_SAMP_FACTOR, #0 ble 99f /* initialize constants */ vmov.u8 d28, #3 vmov.u16 q15, #1 11: ldr INPTR, [INPUT_DATA], #4 ldr OUTPTR, [OUTPUT_DATA], #4 mov WIDTH, DOWNSAMPLED_WIDTH upsample_row OUTPTR, INPTR, WIDTH, TMP subs MAX_V_SAMP_FACTOR, MAX_V_SAMP_FACTOR, #1 bgt 11b 99: vpop {d8-d15} pop {r4, r5, r6, pc} .unreq MAX_V_SAMP_FACTOR .unreq DOWNSAMPLED_WIDTH .unreq INPUT_DATA .unreq OUTPUT_DATA_PTR .unreq OUTPUT_DATA .unreq OUTPTR .unreq INPTR .unreq WIDTH .unreq TMP .purgem upsample16 .purgem upsample32 .purgem upsample_row /*****************************************************************************/ /* * GLOBAL(JOCTET*) * jsimd_huff_encode_one_block (working_state *state, JOCTET *buffer, * JCOEFPTR block, int last_dc_val, * c_derived_tbl *dctbl, c_derived_tbl *actbl) * */ .macro emit_byte BUFFER, PUT_BUFFER, PUT_BITS, ZERO, TMP sub \PUT_BITS, \PUT_BITS, #0x8 lsr \TMP, \PUT_BUFFER, \PUT_BITS uxtb \TMP, \TMP strb \TMP, [\BUFFER, #1]! cmp \TMP, #0xff /*it eq*/ streqb \ZERO, [\BUFFER, #1]! .endm .macro put_bits PUT_BUFFER, PUT_BITS, CODE, SIZE /*lsl \PUT_BUFFER, \PUT_BUFFER, \SIZE*/ add \PUT_BITS, \SIZE /*orr \PUT_BUFFER, \PUT_BUFFER, \CODE*/ orr \PUT_BUFFER, \CODE, \PUT_BUFFER, lsl \SIZE .endm .macro checkbuf15 BUFFER, PUT_BUFFER, PUT_BITS, ZERO, TMP cmp \PUT_BITS, #0x10 blt 15f eor \ZERO, \ZERO, \ZERO emit_byte \BUFFER, \PUT_BUFFER, \PUT_BITS, \ZERO, \TMP emit_byte \BUFFER, \PUT_BUFFER, \PUT_BITS, \ZERO, \TMP 15: .endm .balign 16 jsimd_huff_encode_one_block_neon_consts: .byte 0x01 .byte 0x02 .byte 0x04 .byte 0x08 .byte 0x10 .byte 0x20 .byte 0x40 .byte 0x80 asm_function jsimd_huff_encode_one_block_neon push {r4, r5, r6, r7, r8, r9, r10, r11, lr} add r7, sp, #0x1c sub r4, sp, #0x40 bfc r4, #0, #5 mov sp, r4 /* align sp on 32 bytes */ vst1.64 {d8, d9, d10, d11}, [r4, :128]! vst1.64 {d12, d13, d14, d15}, [r4, :128] sub sp, #0x140 /* reserve 320 bytes */ str r0, [sp, #0x18] /* working state > sp + Ox18 */ add r4, sp, #0x20 /* r4 = t1 */ ldr lr, [r7, #0x8] /* lr = dctbl */ sub r10, r1, #0x1 /* r10=buffer-- */ ldrsh r1, [r2] mov r9, #0x10 mov r8, #0x1 adr r5, jsimd_huff_encode_one_block_neon_consts /* prepare data */ vld1.8 {d26}, [r5, :64] veor q8, q8, q8 veor q9, q9, q9 vdup.16 q14, r9 vdup.16 q15, r8 veor q10, q10, q10 veor q11, q11, q11 sub r1, r1, r3 add r9, r2, #0x22 add r8, r2, #0x18 add r3, r2, #0x36 vmov.16 d0[0], r1 vld1.16 {d2[0]}, [r9, :16] vld1.16 {d4[0]}, [r8, :16] vld1.16 {d6[0]}, [r3, :16] add r1, r2, #0x2 add r9, r2, #0x30 add r8, r2, #0x26 add r3, r2, #0x28 vld1.16 {d0[1]}, [r1, :16] vld1.16 {d2[1]}, [r9, :16] vld1.16 {d4[1]}, [r8, :16] vld1.16 {d6[1]}, [r3, :16] add r1, r2, #0x10 add r9, r2, #0x40 add r8, r2, #0x34 add r3, r2, #0x1a vld1.16 {d0[2]}, [r1, :16] vld1.16 {d2[2]}, [r9, :16] vld1.16 {d4[2]}, [r8, :16] vld1.16 {d6[2]}, [r3, :16] add r1, r2, #0x20 add r9, r2, #0x32 add r8, r2, #0x42 add r3, r2, #0xc vld1.16 {d0[3]}, [r1, :16] vld1.16 {d2[3]}, [r9, :16] vld1.16 {d4[3]}, [r8, :16] vld1.16 {d6[3]}, [r3, :16] add r1, r2, #0x12 add r9, r2, #0x24 add r8, r2, #0x50 add r3, r2, #0xe vld1.16 {d1[0]}, [r1, :16] vld1.16 {d3[0]}, [r9, :16] vld1.16 {d5[0]}, [r8, :16] vld1.16 {d7[0]}, [r3, :16] add r1, r2, #0x4 add r9, r2, #0x16 add r8, r2, #0x60 add r3, r2, #0x1c vld1.16 {d1[1]}, [r1, :16] vld1.16 {d3[1]}, [r9, :16] vld1.16 {d5[1]}, [r8, :16] vld1.16 {d7[1]}, [r3, :16] add r1, r2, #0x6 add r9, r2, #0x8 add r8, r2, #0x52 add r3, r2, #0x2a vld1.16 {d1[2]}, [r1, :16] vld1.16 {d3[2]}, [r9, :16] vld1.16 {d5[2]}, [r8, :16] vld1.16 {d7[2]}, [r3, :16] add r1, r2, #0x14 add r9, r2, #0xa add r8, r2, #0x44 add r3, r2, #0x38 vld1.16 {d1[3]}, [r1, :16] vld1.16 {d3[3]}, [r9, :16] vld1.16 {d5[3]}, [r8, :16] vld1.16 {d7[3]}, [r3, :16] vcgt.s16 q8, q8, q0 vcgt.s16 q9, q9, q1 vcgt.s16 q10, q10, q2 vcgt.s16 q11, q11, q3 vabs.s16 q0, q0 vabs.s16 q1, q1 vabs.s16 q2, q2 vabs.s16 q3, q3 veor q8, q8, q0 veor q9, q9, q1 veor q10, q10, q2 veor q11, q11, q3 add r9, r4, #0x20 add r8, r4, #0x80 add r3, r4, #0xa0 vclz.i16 q0, q0 vclz.i16 q1, q1 vclz.i16 q2, q2 vclz.i16 q3, q3 vsub.i16 q0, q14, q0 vsub.i16 q1, q14, q1 vsub.i16 q2, q14, q2 vsub.i16 q3, q14, q3 vst1.16 {d0, d1, d2, d3}, [r4, :256] vst1.16 {d4, d5, d6, d7}, [r9, :256] vshl.s16 q0, q15, q0 vshl.s16 q1, q15, q1 vshl.s16 q2, q15, q2 vshl.s16 q3, q15, q3 vsub.i16 q0, q0, q15 vsub.i16 q1, q1, q15 vsub.i16 q2, q2, q15 vsub.i16 q3, q3, q15 vand q8, q8, q0 vand q9, q9, q1 vand q10, q10, q2 vand q11, q11, q3 vst1.16 {d16, d17, d18, d19}, [r8, :256] vst1.16 {d20, d21, d22, d23}, [r3, :256] add r1, r2, #0x46 add r9, r2, #0x3a add r8, r2, #0x74 add r3, r2, #0x6a vld1.16 {d8[0]}, [r1, :16] vld1.16 {d10[0]}, [r9, :16] vld1.16 {d12[0]}, [r8, :16] vld1.16 {d14[0]}, [r3, :16] veor q8, q8, q8 veor q9, q9, q9 veor q10, q10, q10 veor q11, q11, q11 add r1, r2, #0x54 add r9, r2, #0x2c add r8, r2, #0x76 add r3, r2, #0x78 vld1.16 {d8[1]}, [r1, :16] vld1.16 {d10[1]}, [r9, :16] vld1.16 {d12[1]}, [r8, :16] vld1.16 {d14[1]}, [r3, :16] add r1, r2, #0x62 add r9, r2, #0x1e add r8, r2, #0x68 add r3, r2, #0x7a vld1.16 {d8[2]}, [r1, :16] vld1.16 {d10[2]}, [r9, :16] vld1.16 {d12[2]}, [r8, :16] vld1.16 {d14[2]}, [r3, :16] add r1, r2, #0x70 add r9, r2, #0x2e add r8, r2, #0x5a add r3, r2, #0x6c vld1.16 {d8[3]}, [r1, :16] vld1.16 {d10[3]}, [r9, :16] vld1.16 {d12[3]}, [r8, :16] vld1.16 {d14[3]}, [r3, :16] add r1, r2, #0x72 add r9, r2, #0x3c add r8, r2, #0x4c add r3, r2, #0x5e vld1.16 {d9[0]}, [r1, :16] vld1.16 {d11[0]}, [r9, :16] vld1.16 {d13[0]}, [r8, :16] vld1.16 {d15[0]}, [r3, :16] add r1, r2, #0x64 add r9, r2, #0x4a add r8, r2, #0x3e add r3, r2, #0x6e vld1.16 {d9[1]}, [r1, :16] vld1.16 {d11[1]}, [r9, :16] vld1.16 {d13[1]}, [r8, :16] vld1.16 {d15[1]}, [r3, :16] add r1, r2, #0x56 add r9, r2, #0x58 add r8, r2, #0x4e add r3, r2, #0x7c vld1.16 {d9[2]}, [r1, :16] vld1.16 {d11[2]}, [r9, :16] vld1.16 {d13[2]}, [r8, :16] vld1.16 {d15[2]}, [r3, :16] add r1, r2, #0x48 add r9, r2, #0x66 add r8, r2, #0x5c add r3, r2, #0x7e vld1.16 {d9[3]}, [r1, :16] vld1.16 {d11[3]}, [r9, :16] vld1.16 {d13[3]}, [r8, :16] vld1.16 {d15[3]}, [r3, :16] vcgt.s16 q8, q8, q4 vcgt.s16 q9, q9, q5 vcgt.s16 q10, q10, q6 vcgt.s16 q11, q11, q7 vabs.s16 q4, q4 vabs.s16 q5, q5 vabs.s16 q6, q6 vabs.s16 q7, q7 veor q8, q8, q4 veor q9, q9, q5 veor q10, q10, q6 veor q11, q11, q7 add r1, r4, #0x40 add r9, r4, #0x60 add r8, r4, #0xc0 add r3, r4, #0xe0 vclz.i16 q4, q4 vclz.i16 q5, q5 vclz.i16 q6, q6 vclz.i16 q7, q7 vsub.i16 q4, q14, q4 vsub.i16 q5, q14, q5 vsub.i16 q6, q14, q6 vsub.i16 q7, q14, q7 vst1.16 {d8, d9, d10, d11}, [r1, :256] vst1.16 {d12, d13, d14, d15}, [r9, :256] vshl.s16 q4, q15, q4 vshl.s16 q5, q15, q5 vshl.s16 q6, q15, q6 vshl.s16 q7, q15, q7 vsub.i16 q4, q4, q15 vsub.i16 q5, q5, q15 vsub.i16 q6, q6, q15 vsub.i16 q7, q7, q15 vand q8, q8, q4 vand q9, q9, q5 vand q10, q10, q6 vand q11, q11, q7 vst1.16 {d16, d17, d18, d19}, [r8, :256] vst1.16 {d20, d21, d22, d23}, [r3, :256] ldr r12, [r7, #0xc] /* r12 = actbl */ add r1, lr, #0x400 /* r1 = dctbl->ehufsi */ mov r9, r12 /* r9 = actbl */ add r6, r4, #0x80 /* r6 = t2 */ ldr r11, [r0, #0x8] /* r11 = put_buffer */ ldr r4, [r0, #0xc] /* r4 = put_bits */ ldrh r2, [r6, #-128] /* r2 = nbits */ ldrh r3, [r6] /* r3 = temp2 & (((JLONG) 1)<<nbits) - 1; */ ldr r0, [lr, r2, lsl #2] ldrb r5, [r1, r2] put_bits r11, r4, r0, r5 checkbuf15 r10, r11, r4, r5, r0 put_bits r11, r4, r3, r2 checkbuf15 r10, r11, r4, r5, r0 mov lr, r6 /* lr = t2 */ add r5, r9, #0x400 /* r5 = actbl->ehufsi */ ldrsb r6, [r5, #0xf0] /* r6 = actbl->ehufsi[0xf0] */ veor q8, q8, q8 vceq.i16 q0, q0, q8 vceq.i16 q1, q1, q8 vceq.i16 q2, q2, q8 vceq.i16 q3, q3, q8 vceq.i16 q4, q4, q8 vceq.i16 q5, q5, q8 vceq.i16 q6, q6, q8 vceq.i16 q7, q7, q8 vmovn.i16 d0, q0 vmovn.i16 d2, q1 vmovn.i16 d4, q2 vmovn.i16 d6, q3 vmovn.i16 d8, q4 vmovn.i16 d10, q5 vmovn.i16 d12, q6 vmovn.i16 d14, q7 vand d0, d0, d26 vand d2, d2, d26 vand d4, d4, d26 vand d6, d6, d26 vand d8, d8, d26 vand d10, d10, d26 vand d12, d12, d26 vand d14, d14, d26 vpadd.i8 d0, d0, d2 vpadd.i8 d4, d4, d6 vpadd.i8 d8, d8, d10 vpadd.i8 d12, d12, d14 vpadd.i8 d0, d0, d4 vpadd.i8 d8, d8, d12 vpadd.i8 d0, d0, d8 vmov.32 r1, d0[1] vmov.32 r8, d0[0] mvn r1, r1 mvn r8, r8 lsrs r1, r1, #0x1 rrx r8, r8 /* shift in last r1 bit while shifting out DC bit */ rbit r1, r1 /* r1 = index1 */ rbit r8, r8 /* r8 = index0 */ ldr r0, [r9, #0x3c0] /* r0 = actbl->ehufco[0xf0] */ str r1, [sp, #0x14] /* index1 > sp + 0x14 */ cmp r8, #0x0 beq 6f 1: clz r2, r8 add lr, lr, r2, lsl #1 lsl r8, r8, r2 ldrh r1, [lr, #-126] 2: cmp r2, #0x10 blt 3f sub r2, r2, #0x10 put_bits r11, r4, r0, r6 cmp r4, #0x10 blt 2b eor r3, r3, r3 emit_byte r10, r11, r4, r3, r12 emit_byte r10, r11, r4, r3, r12 b 2b 3: add r2, r1, r2, lsl #4 ldrh r3, [lr, #2]! ldr r12, [r9, r2, lsl #2] ldrb r2, [r5, r2] put_bits r11, r4, r12, r2 checkbuf15 r10, r11, r4, r2, r12 put_bits r11, r4, r3, r1 checkbuf15 r10, r11, r4, r2, r12 lsls r8, r8, #0x1 bne 1b 6: add r12, sp, #0x20 /* r12 = t1 */ ldr r8, [sp, #0x14] /* r8 = index1 */ adds r12, #0xc0 /* r12 = t2 + (DCTSIZE2/2) */ cmp r8, #0x0 beq 6f clz r2, r8 sub r12, r12, lr lsl r8, r8, r2 add r2, r2, r12, lsr #1 add lr, lr, r2, lsl #1 b 7f 1: clz r2, r8 add lr, lr, r2, lsl #1 lsl r8, r8, r2 7: ldrh r1, [lr, #-126] 2: cmp r2, #0x10 blt 3f sub r2, r2, #0x10 put_bits r11, r4, r0, r6 cmp r4, #0x10 blt 2b eor r3, r3, r3 emit_byte r10, r11, r4, r3, r12 emit_byte r10, r11, r4, r3, r12 b 2b 3: add r2, r1, r2, lsl #4 ldrh r3, [lr, #2]! ldr r12, [r9, r2, lsl #2] ldrb r2, [r5, r2] put_bits r11, r4, r12, r2 checkbuf15 r10, r11, r4, r2, r12 put_bits r11, r4, r3, r1 checkbuf15 r10, r11, r4, r2, r12 lsls r8, r8, #0x1 bne 1b 6: add r0, sp, #0x20 add r0, #0xfe cmp lr, r0 bhs 1f ldr r1, [r9] ldrb r0, [r5] put_bits r11, r4, r1, r0 checkbuf15 r10, r11, r4, r0, r1 1: ldr r12, [sp, #0x18] str r11, [r12, #0x8] str r4, [r12, #0xc] add r0, r10, #0x1 add r4, sp, #0x140 vld1.64 {d8, d9, d10, d11}, [r4, :128]! vld1.64 {d12, d13, d14, d15}, [r4, :128] sub r4, r7, #0x1c mov sp, r4 pop {r4, r5, r6, r7, r8, r9, r10, r11, pc} .purgem emit_byte .purgem put_bits .purgem checkbuf15