kc3-lang/libjpeg-turbo/simd/x86_64/jdsample-avx2.asm

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  Date : 2024-08-31T16:50:08
  

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• simd/x86_64/jdsample-avx2.asm

• ;
  ; jdsample.asm - upsampling (64-bit AVX2)
  ;
  ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  ; Copyright (C) 2009, 2016, 2024, D. R. Commander.
  ; Copyright (C) 2015, Intel Corporation.
  ; Copyright (C) 2018, Matthias Räncker.
  ; Copyright (C) 2023, Aliaksiej Kandracienka.
  ;
  ; Based on the x86 SIMD extension for IJG JPEG library
  ; Copyright (C) 1999-2006, MIYASAKA Masaru.
  ; For conditions of distribution and use, see copyright notice in jsimdext.inc
  ;
  ; This file should be assembled with NASM (Netwide Assembler) or Yasm.
  
  %include "jsimdext.inc"
  
  ; --------------------------------------------------------------------------
      SECTION     SEG_CONST
  
      ALIGNZ      32
      GLOBAL_DATA(jconst_fancy_upsample_avx2)
  
  EXTN(jconst_fancy_upsample_avx2):
  
  PW_ONE   times 16 dw 1
  PW_TWO   times 16 dw 2
  PW_THREE times 16 dw 3
  PW_SEVEN times 16 dw 7
  PW_EIGHT times 16 dw 8
  
      ALIGNZ      32
  
  ; --------------------------------------------------------------------------
      SECTION     SEG_TEXT
      BITS        64
  ;
  ; Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
  ;
  ; The upsampling algorithm is linear interpolation between pixel centers,
  ; also known as a "triangle filter".  This is a good compromise between
  ; speed and visual quality.  The centers of the output pixels are 1/4 and 3/4
  ; of the way between input pixel centers.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v1_fancy_upsample_avx2(int max_v_samp_factor,
  ;                                JDIMENSION downsampled_width,
  ;                                JSAMPARRAY input_data,
  ;                                JSAMPARRAY *output_data_ptr);
  ;
  
  ; r10 = int max_v_samp_factor
  ; r11d = JDIMENSION downsampled_width
  ; r12 = JSAMPARRAY input_data
  ; r13 = JSAMPARRAY *output_data_ptr
  
      align       32
      GLOBAL_FUNCTION(jsimd_h2v1_fancy_upsample_avx2)
  
  EXTN(jsimd_h2v1_fancy_upsample_avx2):
      ENDBR64
      push        rbp
      mov         rbp, rsp
      PUSH_XMM    3
      COLLECT_ARGS 4
  
      mov         eax, r11d               ; colctr
      test        rax, rax
      jz          near .return
  
      mov         rcx, r10                ; rowctr
      test        rcx, rcx
      jz          near .return
  
      mov         rsi, r12                ; input_data
      mov         rdi, r13
      mov         rdip, JSAMPARRAY [rdi]  ; output_data
  
      vpxor       ymm0, ymm0, ymm0                 ; ymm0=(all 0's)
      vpcmpeqb    xmm9, xmm9, xmm9
      vpsrldq     xmm10, xmm9, (SIZEOF_XMMWORD-1)  ; (ff -- -- -- ... -- --) LSB is ff
  
      vpslldq     xmm9, xmm9, (SIZEOF_XMMWORD-1)
      vperm2i128  ymm9, ymm9, ymm9, 1              ; (---- ---- ... ---- ---- ff) MSB is ff
  
  .rowloop:
      push        rax                     ; colctr
      push        rdi
      push        rsi
  
      mov         rsip, JSAMPROW [rsi]    ; inptr
      mov         rdip, JSAMPROW [rdi]    ; outptr
  
      test        rax, SIZEOF_YMMWORD-1
      jz          short .skip
      mov         dl, JSAMPLE [rsi+(rax-1)*SIZEOF_JSAMPLE]
      mov         JSAMPLE [rsi+rax*SIZEOF_JSAMPLE], dl    ; insert a dummy sample
  .skip:
      vpand       ymm7, ymm10, YMMWORD [rsi+0*SIZEOF_YMMWORD]
  
      add         rax, byte SIZEOF_YMMWORD-1
      and         rax, byte -SIZEOF_YMMWORD
      cmp         rax, byte SIZEOF_YMMWORD
      ja          short .columnloop
  
  .columnloop_last:
      vpand       ymm6, ymm9, YMMWORD [rsi+0*SIZEOF_YMMWORD]
      jmp         short .upsample
  
  .columnloop:
      vmovdqu     ymm6, YMMWORD [rsi+1*SIZEOF_YMMWORD]
      vperm2i128  ymm6, ymm0, ymm6, 0x20
      vpslldq     ymm6, ymm6, 15
  
  .upsample:
      vmovdqu     ymm1, YMMWORD [rsi+0*SIZEOF_YMMWORD]  ; ymm1=( 0  1  2 ... 29 30 31)
  
      vperm2i128  ymm2, ymm0, ymm1, 0x20
      vpalignr    ymm2, ymm1, ymm2, 15            ; ymm2=(--  0  1 ... 28 29 30)
      vperm2i128  ymm4, ymm0, ymm1, 0x03
      vpalignr    ymm3, ymm4, ymm1, 1             ; ymm3=( 1  2  3 ... 30 31 --)
  
      vpor        ymm2, ymm2, ymm7                ; ymm2=(-1  0  1 ... 28 29 30)
      vpor        ymm3, ymm3, ymm6                ; ymm3=( 1  2  3 ... 30 31 32)
  
      vpsrldq     ymm7, ymm4, (SIZEOF_XMMWORD-1)  ; ymm7=(31 -- -- ... -- -- --)
  
      vpunpckhbw  ymm4, ymm1, ymm0                ; ymm4=( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm5, ymm1, ymm0                ; ymm5=( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm1, ymm5, ymm4, 0x20          ; ymm1=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm4, ymm5, ymm4, 0x31          ; ymm4=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpunpckhbw  ymm5, ymm2, ymm0                ; ymm5=( 7  8  9 10 11 12 13 14 23 24 25 26 27 28 29 30)
      vpunpcklbw  ymm6, ymm2, ymm0                ; ymm6=(-1  0  1  2  3  4  5  6 15 16 17 18 19 20 21 22)
      vperm2i128  ymm2, ymm6, ymm5, 0x20          ; ymm2=(-1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14)
      vperm2i128  ymm5, ymm6, ymm5, 0x31          ; ymm5=(15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
  
      vpunpckhbw  ymm6, ymm3, ymm0                ; ymm6=( 1  2  3  4  5  6  7  8 17 18 19 20 21 22 23 24)
      vpunpcklbw  ymm8, ymm3, ymm0                ; ymm8=( 9 10 11 12 13 14 15 16 25 26 27 28 29 30 31 32)
      vperm2i128  ymm3, ymm8, ymm6, 0x20          ; ymm3=( 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16)
      vperm2i128  ymm6, ymm8, ymm6, 0x31          ; ymm6=(17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32)
  
      vpmullw     ymm1, ymm1, [rel PW_THREE]
      vpmullw     ymm4, ymm4, [rel PW_THREE]
      vpaddw      ymm2, ymm2, [rel PW_ONE]
      vpaddw      ymm5, ymm5, [rel PW_ONE]
      vpaddw      ymm3, ymm3, [rel PW_TWO]
      vpaddw      ymm6, ymm6, [rel PW_TWO]
  
      vpaddw      ymm2, ymm2, ymm1
      vpaddw      ymm5, ymm5, ymm4
      vpsrlw      ymm2, ymm2, 2                   ; ymm2=OutLE=( 0  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30)
      vpsrlw      ymm5, ymm5, 2                   ; ymm5=OutHE=(32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62)
      vpaddw      ymm3, ymm3, ymm1
      vpaddw      ymm6, ymm6, ymm4
      vpsrlw      ymm3, ymm3, 2                   ; ymm3=OutLO=( 1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31)
      vpsrlw      ymm6, ymm6, 2                   ; ymm6=OutHO=(33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63)
  
      vpsllw      ymm3, ymm3, BYTE_BIT
      vpsllw      ymm6, ymm6, BYTE_BIT
      vpor        ymm2, ymm2, ymm3                ; ymm2=OutL=( 0  1  2 ... 29 30 31)
      vpor        ymm5, ymm5, ymm6                ; ymm5=OutH=(32 33 34 ... 61 62 63)
  
      vmovdqu     YMMWORD [rdi+0*SIZEOF_YMMWORD], ymm2
      vmovdqu     YMMWORD [rdi+1*SIZEOF_YMMWORD], ymm5
  
      sub         rax, byte SIZEOF_YMMWORD
      add         rsi, byte 1*SIZEOF_YMMWORD  ; inptr
      add         rdi, byte 2*SIZEOF_YMMWORD  ; outptr
      cmp         rax, byte SIZEOF_YMMWORD
      ja          near .columnloop
      test        eax, eax
      jnz         near .columnloop_last
  
      pop         rsi
      pop         rdi
      pop         rax
  
      add         rsi, byte SIZEOF_JSAMPROW  ; input_data
      add         rdi, byte SIZEOF_JSAMPROW  ; output_data
      dec         rcx                        ; rowctr
      jg          near .rowloop
  
  .return:
      vzeroupper
      UNCOLLECT_ARGS 4
      POP_XMM     3
      pop         rbp
      ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
  ; Again a triangle filter; see comments for h2v1 case, above.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v2_fancy_upsample_avx2(int max_v_samp_factor,
  ;                                JDIMENSION downsampled_width,
  ;                                JSAMPARRAY input_data,
  ;                                JSAMPARRAY *output_data_ptr);
  ;
  
  ; r10 = int max_v_samp_factor
  ; r11d = JDIMENSION downsampled_width
  ; r12 = JSAMPARRAY input_data
  ; r13 = JSAMPARRAY *output_data_ptr
  
  %define wk(i)   r15 - (WK_NUM - (i)) * SIZEOF_YMMWORD  ; ymmword wk[WK_NUM]
  %define WK_NUM  4
  
      align       32
      GLOBAL_FUNCTION(jsimd_h2v2_fancy_upsample_avx2)
  
  EXTN(jsimd_h2v2_fancy_upsample_avx2):
      ENDBR64
      push        rbp
      mov         rbp, rsp
      push        r15
      and         rsp, byte (-SIZEOF_YMMWORD)  ; align to 128 bits
      ; Allocate stack space for wk array.  r15 is used to access it.
      mov         r15, rsp
      sub         rsp, (SIZEOF_YMMWORD * WK_NUM)
      PUSH_XMM    3
      COLLECT_ARGS 4
      push        rbx
  
      mov         eax, r11d               ; colctr
      test        rax, rax
      jz          near .return
  
      mov         rcx, r10                ; rowctr
      test        rcx, rcx
      jz          near .return
  
      mov         rsi, r12                ; input_data
      mov         rdi, r13
      mov         rdip, JSAMPARRAY [rdi]  ; output_data
  .rowloop:
      push        rax                     ; colctr
      push        rcx
      push        rdi
      push        rsi
  
      mov         rcxp, JSAMPROW [rsi-1*SIZEOF_JSAMPROW]  ; inptr1(above)
      mov         rbxp, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]  ; inptr0
      mov         rsip, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]  ; inptr1(below)
      mov         rdxp, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]  ; outptr0
      mov         rdip, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]  ; outptr1
  
      vpxor       ymm8, ymm8, ymm8                 ; ymm8=(all 0's)
      vpcmpeqb    xmm9, xmm9, xmm9
      vpsrldq     xmm10, xmm9, (SIZEOF_XMMWORD-2)  ; (ffff ---- ---- ... ---- ----) LSB is ffff
      vpslldq     xmm9, xmm9, (SIZEOF_XMMWORD-2)
      vperm2i128  ymm9, ymm9, ymm9, 1              ; (---- ---- ... ---- ---- ffff) MSB is ffff
  
      test        rax, SIZEOF_YMMWORD-1
      jz          short .skip
      push        rdx
      mov         dl, JSAMPLE [rcx+(rax-1)*SIZEOF_JSAMPLE]
      mov         JSAMPLE [rcx+rax*SIZEOF_JSAMPLE], dl
      mov         dl, JSAMPLE [rbx+(rax-1)*SIZEOF_JSAMPLE]
      mov         JSAMPLE [rbx+rax*SIZEOF_JSAMPLE], dl
      mov         dl, JSAMPLE [rsi+(rax-1)*SIZEOF_JSAMPLE]
      mov         JSAMPLE [rsi+rax*SIZEOF_JSAMPLE], dl    ; insert a dummy sample
      pop         rdx
  .skip:
      ; -- process the first column block
  
      vmovdqu     ymm0, YMMWORD [rbx+0*SIZEOF_YMMWORD]  ; ymm0=row[ 0][0]
      vmovdqu     ymm1, YMMWORD [rcx+0*SIZEOF_YMMWORD]  ; ymm1=row[-1][0]
      vmovdqu     ymm2, YMMWORD [rsi+0*SIZEOF_YMMWORD]  ; ymm2=row[+1][0]
  
      vpunpckhbw  ymm4, ymm0, ymm8        ; ymm4=row[ 0]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm5, ymm0, ymm8        ; ymm5=row[ 0]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm0, ymm5, ymm4, 0x20  ; ymm0=row[ 0]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm4, ymm5, ymm4, 0x31  ; ymm4=row[ 0](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpunpckhbw  ymm5, ymm1, ymm8        ; ymm5=row[-1]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm6, ymm1, ymm8        ; ymm6=row[-1]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm1, ymm6, ymm5, 0x20  ; ymm1=row[-1]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm5, ymm6, ymm5, 0x31  ; ymm5=row[-1](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpunpckhbw  ymm6, ymm2, ymm8        ; ymm6=row[+1]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm3, ymm2, ymm8        ; ymm3=row[+1]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm2, ymm3, ymm6, 0x20  ; ymm2=row[+1]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm6, ymm3, ymm6, 0x31  ; ymm6=row[+1](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpmullw     ymm0, ymm0, [rel PW_THREE]
      vpmullw     ymm4, ymm4, [rel PW_THREE]
  
      vpaddw      ymm1, ymm1, ymm0        ; ymm1=Int0L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vpaddw      ymm5, ymm5, ymm4        ; ymm5=Int0H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
      vpaddw      ymm2, ymm2, ymm0        ; ymm2=Int1L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vpaddw      ymm6, ymm6, ymm4        ; ymm6=Int1H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vmovdqu     YMMWORD [rdx+0*SIZEOF_YMMWORD], ymm1  ; temporarily save
      vmovdqu     YMMWORD [rdx+1*SIZEOF_YMMWORD], ymm5  ; the intermediate data
      vmovdqu     YMMWORD [rdi+0*SIZEOF_YMMWORD], ymm2
      vmovdqu     YMMWORD [rdi+1*SIZEOF_YMMWORD], ymm6
  
      vpand       ymm1, ymm1, ymm10       ; ymm1=( 0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
      vpand       ymm2, ymm2, ymm10       ; ymm2=( 0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
  
      vmovdqa     YMMWORD [wk(0)], ymm1
      vmovdqa     YMMWORD [wk(1)], ymm2
  
      add         rax, byte SIZEOF_YMMWORD-1
      and         rax, byte -SIZEOF_YMMWORD
      cmp         rax, byte SIZEOF_YMMWORD
      ja          short .columnloop
  
  .columnloop_last:
      ; -- process the last column block
  
      vpand       ymm1, ymm9, YMMWORD [rdx+1*SIZEOF_YMMWORD]
      vpand       ymm2, ymm9, YMMWORD [rdi+1*SIZEOF_YMMWORD]
  
      vmovdqa     YMMWORD [wk(2)], ymm1   ; ymm1=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 31)
      vmovdqa     YMMWORD [wk(3)], ymm2   ; ymm2=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 31)
  
      jmp         near .upsample
  
  .columnloop:
      ; -- process the next column block
  
      vmovdqu     ymm0, YMMWORD [rbx+1*SIZEOF_YMMWORD]  ; ymm0=row[ 0][1]
      vmovdqu     ymm1, YMMWORD [rcx+1*SIZEOF_YMMWORD]  ; ymm1=row[-1][1]
      vmovdqu     ymm2, YMMWORD [rsi+1*SIZEOF_YMMWORD]  ; ymm2=row[+1][1]
  
      vpunpckhbw  ymm4, ymm0, ymm8        ; ymm4=row[ 0]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm5, ymm0, ymm8        ; ymm5=row[ 0]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm0, ymm5, ymm4, 0x20  ; ymm0=row[ 0]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm4, ymm5, ymm4, 0x31  ; ymm4=row[ 0](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpunpckhbw  ymm5, ymm1, ymm8        ; ymm5=row[-1]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm6, ymm1, ymm8        ; ymm6=row[-1]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm1, ymm6, ymm5, 0x20  ; ymm1=row[-1]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm5, ymm6, ymm5, 0x31  ; ymm5=row[-1](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpunpckhbw  ymm6, ymm2, ymm8        ; ymm6=row[+1]( 8  9 10 11 12 13 14 15 24 25 26 27 28 29 30 31)
      vpunpcklbw  ymm7, ymm2, ymm8        ; ymm7=row[+1]( 0  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23)
      vperm2i128  ymm2, ymm7, ymm6, 0x20  ; ymm2=row[+1]( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vperm2i128  ymm6, ymm7, ymm6, 0x31  ; ymm6=row[+1](16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vpmullw     ymm0, ymm0, [rel PW_THREE]
      vpmullw     ymm4, ymm4, [rel PW_THREE]
  
      vpaddw      ymm1, ymm1, ymm0        ; ymm1=Int0L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vpaddw      ymm5, ymm5, ymm4        ; ymm5=Int0H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
      vpaddw      ymm2, ymm2, ymm0        ; ymm2=Int1L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vpaddw      ymm6, ymm6, ymm4        ; ymm6=Int1H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vmovdqu     YMMWORD [rdx+2*SIZEOF_YMMWORD], ymm1  ; temporarily save
      vmovdqu     YMMWORD [rdx+3*SIZEOF_YMMWORD], ymm5  ; the intermediate data
      vmovdqu     YMMWORD [rdi+2*SIZEOF_YMMWORD], ymm2
      vmovdqu     YMMWORD [rdi+3*SIZEOF_YMMWORD], ymm6
  
      vperm2i128  ymm1, ymm8, ymm1, 0x20
      vpslldq     ymm1, ymm1, 14          ; ymm1=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- --  0)
      vperm2i128  ymm2, ymm8, ymm2, 0x20
      vpslldq     ymm2, ymm2, 14          ; ymm2=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- --  0)
  
      vmovdqa     YMMWORD [wk(2)], ymm1
      vmovdqa     YMMWORD [wk(3)], ymm2
  
  .upsample:
      ; -- process the upper row
  
      vmovdqu     ymm7, YMMWORD [rdx+0*SIZEOF_YMMWORD]  ; ymm7=Int0L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vmovdqu     ymm3, YMMWORD [rdx+1*SIZEOF_YMMWORD]  ; ymm3=Int0H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vperm2i128  ymm0, ymm8, ymm7, 0x03
      vpalignr    ymm0, ymm0, ymm7, 2     ; ymm0=( 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 --)
      vperm2i128  ymm4, ymm8, ymm3, 0x20
      vpslldq     ymm4, ymm4, 14          ; ymm4=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 16)
  
      vperm2i128  ymm5, ymm8, ymm7, 0x03
      vpsrldq     ymm5, ymm5, 14          ; ymm5=(15 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
      vperm2i128  ymm6, ymm8, ymm3, 0x20
      vpalignr    ymm6, ymm3, ymm6, 14    ; ymm6=(-- 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
  
      vpor        ymm0, ymm0, ymm4        ; ymm0=( 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16)
      vpor        ymm5, ymm5, ymm6        ; ymm5=(15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
  
      vperm2i128  ymm2, ymm8, ymm3, 0x03
      vpalignr    ymm2, ymm2, ymm3, 2     ; ymm2=(17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 --)
      vperm2i128  ymm4, ymm8, ymm3, 0x03
      vpsrldq     ymm4, ymm4, 14          ; ymm4=(31 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
      vperm2i128  ymm1, ymm8, ymm7, 0x20
      vpalignr    ymm1, ymm7, ymm1, 14    ; ymm1=(--  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14)
  
      vpor        ymm1, ymm1, YMMWORD [wk(0)]  ; ymm1=(-1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14)
      vpor        ymm2, ymm2, YMMWORD [wk(2)]  ; ymm2=(17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32)
  
      vmovdqa     YMMWORD [wk(0)], ymm4
  
      vpmullw     ymm7, ymm7, [rel PW_THREE]
      vpmullw     ymm3, ymm3, [rel PW_THREE]
      vpaddw      ymm1, ymm1, [rel PW_EIGHT]
      vpaddw      ymm5, ymm5, [rel PW_EIGHT]
      vpaddw      ymm0, ymm0, [rel PW_SEVEN]
      vpaddw      ymm2, [rel PW_SEVEN]
  
      vpaddw      ymm1, ymm1, ymm7
      vpaddw      ymm5, ymm5, ymm3
      vpsrlw      ymm1, ymm1, 4           ; ymm1=Out0LE=( 0  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30)
      vpsrlw      ymm5, ymm5, 4           ; ymm5=Out0HE=(32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62)
      vpaddw      ymm0, ymm0, ymm7
      vpaddw      ymm2, ymm2, ymm3
      vpsrlw      ymm0, ymm0, 4           ; ymm0=Out0LO=( 1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31)
      vpsrlw      ymm2, ymm2, 4           ; ymm2=Out0HO=(33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63)
  
      vpsllw      ymm0, ymm0, BYTE_BIT
      vpsllw      ymm2, ymm2, BYTE_BIT
      vpor        ymm1, ymm1, ymm0        ; ymm1=Out0L=( 0  1  2 ... 29 30 31)
      vpor        ymm5, ymm5, ymm2        ; ymm5=Out0H=(32 33 34 ... 61 62 63)
  
      vmovdqu     YMMWORD [rdx+0*SIZEOF_YMMWORD], ymm1
      vmovdqu     YMMWORD [rdx+1*SIZEOF_YMMWORD], ymm5
  
      ; -- process the lower row
  
      vmovdqu     ymm6, YMMWORD [rdi+0*SIZEOF_YMMWORD]  ; ymm6=Int1L=( 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15)
      vmovdqu     ymm4, YMMWORD [rdi+1*SIZEOF_YMMWORD]  ; ymm4=Int1H=(16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
  
      vperm2i128  ymm7, ymm8, ymm6, 0x03
      vpalignr    ymm7, ymm7, ymm6, 2     ; ymm7=( 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 --)
      vperm2i128  ymm3, ymm8, ymm4, 0x20
      vpslldq     ymm3, ymm3, 14          ; ymm3=(-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 16)
  
      vperm2i128  ymm0, ymm8, ymm6, 0x03
      vpsrldq     ymm0, ymm0, 14          ; ymm0=(15 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
      vperm2i128  ymm2, ymm8, ymm4, 0x20
      vpalignr    ymm2, ymm4, ymm2, 14    ; ymm2=(-- 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
  
      vpor        ymm7, ymm7, ymm3        ; ymm7=( 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16)
      vpor        ymm0, ymm0, ymm2        ; ymm0=(15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
  
      vperm2i128  ymm5, ymm8, ymm4, 0x03
      vpalignr    ymm5, ymm5, ymm4, 2     ; ymm5=(17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 --)
      vperm2i128  ymm3, ymm8, ymm4, 0x03
      vpsrldq     ymm3, ymm3, 14          ; ymm3=(31 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --)
      vperm2i128  ymm1, ymm8, ymm6, 0x20
      vpalignr    ymm1, ymm6, ymm1, 14    ; ymm1=(--  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14)
  
      vpor        ymm1, ymm1, YMMWORD [wk(1)]  ; ymm1=(-1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14)
      vpor        ymm5, ymm5, YMMWORD [wk(3)]  ; ymm5=(17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32)
  
      vmovdqa     YMMWORD [wk(1)], ymm3
  
      vpmullw     ymm6, ymm6, [rel PW_THREE]
      vpmullw     ymm4, ymm4, [rel PW_THREE]
      vpaddw      ymm1, ymm1, [rel PW_EIGHT]
      vpaddw      ymm0, ymm0, [rel PW_EIGHT]
      vpaddw      ymm7, ymm7, [rel PW_SEVEN]
      vpaddw      ymm5, ymm5, [rel PW_SEVEN]
  
      vpaddw      ymm1, ymm1, ymm6
      vpaddw      ymm0, ymm0, ymm4
      vpsrlw      ymm1, ymm1, 4           ; ymm1=Out1LE=( 0  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30)
      vpsrlw      ymm0, ymm0, 4           ; ymm0=Out1HE=(32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62)
      vpaddw      ymm7, ymm7, ymm6
      vpaddw      ymm5, ymm5, ymm4
      vpsrlw      ymm7, ymm7, 4           ; ymm7=Out1LO=( 1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31)
      vpsrlw      ymm5, ymm5, 4           ; ymm5=Out1HO=(33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63)
  
      vpsllw      ymm7, ymm7, BYTE_BIT
      vpsllw      ymm5, ymm5, BYTE_BIT
      vpor        ymm1, ymm1, ymm7        ; ymm1=Out1L=( 0  1  2 ... 29 30 31)
      vpor        ymm0, ymm0, ymm5        ; ymm0=Out1H=(32 33 34 ... 61 62 63)
  
      vmovdqu     YMMWORD [rdi+0*SIZEOF_YMMWORD], ymm1
      vmovdqu     YMMWORD [rdi+1*SIZEOF_YMMWORD], ymm0
  
      sub         rax, byte SIZEOF_YMMWORD
      add         rcx, byte 1*SIZEOF_YMMWORD  ; inptr1(above)
      add         rbx, byte 1*SIZEOF_YMMWORD  ; inptr0
      add         rsi, byte 1*SIZEOF_YMMWORD  ; inptr1(below)
      add         rdx, byte 2*SIZEOF_YMMWORD  ; outptr0
      add         rdi, byte 2*SIZEOF_YMMWORD  ; outptr1
      cmp         rax, byte SIZEOF_YMMWORD
      ja          near .columnloop
      test        rax, rax
      jnz         near .columnloop_last
  
      pop         rsi
      pop         rdi
      pop         rcx
      pop         rax
  
      add         rsi, byte 1*SIZEOF_JSAMPROW  ; input_data
      add         rdi, byte 2*SIZEOF_JSAMPROW  ; output_data
      sub         rcx, byte 2                  ; rowctr
      jg          near .rowloop
  
  .return:
      pop         rbx
      vzeroupper
      UNCOLLECT_ARGS 4
      POP_XMM     3
      lea         rsp, [rbp-8]
      pop         r15
      pop         rbp
      ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
  ; It's still a box filter.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v1_upsample_avx2(int max_v_samp_factor, JDIMENSION output_width,
  ;                          JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr);
  ;
  
  ; r10 = int max_v_samp_factor
  ; r11d = JDIMENSION output_width
  ; r12 = JSAMPARRAY input_data
  ; r13 = JSAMPARRAY *output_data_ptr
  
      align       32
      GLOBAL_FUNCTION(jsimd_h2v1_upsample_avx2)
  
  EXTN(jsimd_h2v1_upsample_avx2):
      ENDBR64
      push        rbp
      mov         rbp, rsp
      COLLECT_ARGS 4
  
      mov         edx, r11d
      add         rdx, byte (SIZEOF_YMMWORD-1)
      and         rdx, -SIZEOF_YMMWORD
      jz          near .return
  
      mov         rcx, r10                ; rowctr
      test        rcx, rcx
      jz          short .return
  
      mov         rsi, r12                ; input_data
      mov         rdi, r13
      mov         rdip, JSAMPARRAY [rdi]  ; output_data
  .rowloop:
      push        rdi
      push        rsi
  
      mov         rsip, JSAMPROW [rsi]    ; inptr
      mov         rdip, JSAMPROW [rdi]    ; outptr
      mov         rax, rdx                ; colctr
  .columnloop:
  
      cmp         rax, byte SIZEOF_YMMWORD
      ja          near .above_16
  
      vmovdqu     xmm0, XMMWORD [rsi+0*SIZEOF_YMMWORD]
      vpunpckhbw  xmm1, xmm0, xmm0
      vpunpcklbw  xmm0, xmm0, xmm0
  
      vmovdqu     XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
      vmovdqu     XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm1
  
      jmp         short .nextrow
  
  .above_16:
      vmovdqu     ymm0, YMMWORD [rsi+0*SIZEOF_YMMWORD]
  
      vpermq      ymm0, ymm0, 0xd8
      vpunpckhbw  ymm1, ymm0, ymm0
      vpunpcklbw  ymm0, ymm0, ymm0
  
      vmovdqu     YMMWORD [rdi+0*SIZEOF_YMMWORD], ymm0
      vmovdqu     YMMWORD [rdi+1*SIZEOF_YMMWORD], ymm1
  
      sub         rax, byte 2*SIZEOF_YMMWORD
      jz          short .nextrow
  
      add         rsi, byte SIZEOF_YMMWORD    ; inptr
      add         rdi, byte 2*SIZEOF_YMMWORD  ; outptr
      jmp         short .columnloop
  
  .nextrow:
      pop         rsi
      pop         rdi
  
      add         rsi, byte SIZEOF_JSAMPROW  ; input_data
      add         rdi, byte SIZEOF_JSAMPROW  ; output_data
      dec         rcx                        ; rowctr
      jg          short .rowloop
  
  .return:
      vzeroupper
      UNCOLLECT_ARGS 4
      pop         rbp
      ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
  ; It's still a box filter.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v2_upsample_avx2(int max_v_samp_factor, JDIMENSION output_width,
  ;                          JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr);
  ;
  
  ; r10 = int max_v_samp_factor
  ; r11d = JDIMENSION output_width
  ; r12 = JSAMPARRAY input_data
  ; r13 = JSAMPARRAY *output_data_ptr
  
      align       32
      GLOBAL_FUNCTION(jsimd_h2v2_upsample_avx2)
  
  EXTN(jsimd_h2v2_upsample_avx2):
      ENDBR64
      push        rbp
      mov         rbp, rsp
      COLLECT_ARGS 4
      push        rbx
  
      mov         edx, r11d
      add         rdx, byte (SIZEOF_YMMWORD-1)
      and         rdx, -SIZEOF_YMMWORD
      jz          near .return
  
      mov         rcx, r10                ; rowctr
      test        rcx, rcx
      jz          near .return
  
      mov         rsi, r12                ; input_data
      mov         rdi, r13
      mov         rdip, JSAMPARRAY [rdi]  ; output_data
  .rowloop:
      push        rdi
      push        rsi
  
      mov         rsip, JSAMPROW [rsi]                   ; inptr
      mov         rbxp, JSAMPROW [rdi+0*SIZEOF_JSAMPROW] ; outptr0
      mov         rdip, JSAMPROW [rdi+1*SIZEOF_JSAMPROW] ; outptr1
      mov         rax, rdx                               ; colctr
  .columnloop:
  
      cmp         rax, byte SIZEOF_YMMWORD
      ja          short .above_16
  
      vmovdqu     xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
      vpunpckhbw  xmm1, xmm0, xmm0
      vpunpcklbw  xmm0, xmm0, xmm0
  
      vmovdqu     XMMWORD [rbx+0*SIZEOF_XMMWORD], xmm0
      vmovdqu     XMMWORD [rbx+1*SIZEOF_XMMWORD], xmm1
      vmovdqu     XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
      vmovdqu     XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm1
  
      jmp         near .nextrow
  
  .above_16:
      vmovdqu     ymm0, YMMWORD [rsi+0*SIZEOF_YMMWORD]
  
      vpermq      ymm0, ymm0, 0xd8
      vpunpckhbw  ymm1, ymm0, ymm0
      vpunpcklbw  ymm0, ymm0, ymm0
  
      vmovdqu     YMMWORD [rbx+0*SIZEOF_YMMWORD], ymm0
      vmovdqu     YMMWORD [rbx+1*SIZEOF_YMMWORD], ymm1
      vmovdqu     YMMWORD [rdi+0*SIZEOF_YMMWORD], ymm0
      vmovdqu     YMMWORD [rdi+1*SIZEOF_YMMWORD], ymm1
  
      sub         rax, byte 2*SIZEOF_YMMWORD
      jz          short .nextrow
  
      add         rsi, byte SIZEOF_YMMWORD  ; inptr
      add         rbx, 2*SIZEOF_YMMWORD     ; outptr0
      add         rdi, 2*SIZEOF_YMMWORD     ; outptr1
      jmp         short .columnloop
  
  .nextrow:
      pop         rsi
      pop         rdi
  
      add         rsi, byte 1*SIZEOF_JSAMPROW  ; input_data
      add         rdi, byte 2*SIZEOF_JSAMPROW  ; output_data
      sub         rcx, byte 2                  ; rowctr
      jg          near .rowloop
  
  .return:
      pop         rbx
      vzeroupper
      UNCOLLECT_ARGS 4
      pop         rbp
      ret
  
  ; For some reason, the OS X linker does not honor the request to align the
  ; segment unless we do this.
      align       32
  

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