kc3-lang/libjpeg-turbo/simd/x86_64/jquanti-sse2.asm

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• Hash : 7b844bfd
  Author :
  Date : 2023-07-28T11:46:10
  

  x86-64 SIMD: Use std stack frame/prologue/epilogue
  
  This allows debuggers and profilers to reliably capture backtraces from
  within the x86-64 SIMD functions.
  
  In places where rbp was previously used to access temporary variables
  (after stack alignment), we now use r15 and save/restore it accordingly.
  The total amount of work is approximately the same, because the previous
  code pushed the pre-alignment stack pointer to the aligned stack.  The
  new prologue and epilogue actually have fewer instructions.
  
  Also note that the {un}collect_args macros now use rbp instead of rax to
  access arguments passed on the stack, so we save a few instructions
  there as well.
  
  Based on:
  https://github.com/alk/libjpeg-turbo/commit/debcc7c3b436467aea8d02c66a514c5099d0ad37
  
  Closes #707
  Closes #708
  

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• simd/x86_64/jquanti-sse2.asm

• ;
  ; jquanti.asm - sample data conversion and quantization (64-bit SSE2)
  ;
  ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  ; Copyright (C) 2009, 2016, D. R. Commander.
  ; Copyright (C) 2018, Matthias Räncker.
  ;
  ; 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),
  ; can *not* be assembled with Microsoft's MASM or any compatible
  ; assembler (including Borland's Turbo Assembler).
  ; NASM is available from http://nasm.sourceforge.net/ or
  ; http://sourceforge.net/project/showfiles.php?group_id=6208
  
  %include "jsimdext.inc"
  %include "jdct.inc"
  
  ; --------------------------------------------------------------------------
      SECTION     SEG_TEXT
      BITS        64
  ;
  ; Load data into workspace, applying unsigned->signed conversion
  ;
  ; GLOBAL(void)
  ; jsimd_convsamp_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
  ;                     DCTELEM *workspace);
  ;
  
  ; r10 = JSAMPARRAY sample_data
  ; r11d = JDIMENSION start_col
  ; r12 = DCTELEM *workspace
  
      align       32
      GLOBAL_FUNCTION(jsimd_convsamp_sse2)
  
  EXTN(jsimd_convsamp_sse2):
      push        rbp
      mov         rbp, rsp
      collect_args 3
      push        rbx
  
      pxor        xmm6, xmm6              ; xmm6=(all 0's)
      pcmpeqw     xmm7, xmm7
      psllw       xmm7, 7                 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
  
      mov         rsi, r10
      mov         eax, r11d
      mov         rdi, r12
      mov         rcx, DCTSIZE/4
  .convloop:
      mov         rbxp, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]  ; (JSAMPLE *)
      mov         rdxp, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]  ; (JSAMPLE *)
  
      movq        xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]  ; xmm0=(01234567)
      movq        xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]  ; xmm1=(89ABCDEF)
  
      mov         rbxp, JSAMPROW [rsi+2*SIZEOF_JSAMPROW]  ; (JSAMPLE *)
      mov         rdxp, JSAMPROW [rsi+3*SIZEOF_JSAMPROW]  ; (JSAMPLE *)
  
      movq        xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]  ; xmm2=(GHIJKLMN)
      movq        xmm3, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]  ; xmm3=(OPQRSTUV)
  
      punpcklbw   xmm0, xmm6              ; xmm0=(01234567)
      punpcklbw   xmm1, xmm6              ; xmm1=(89ABCDEF)
      paddw       xmm0, xmm7
      paddw       xmm1, xmm7
      punpcklbw   xmm2, xmm6              ; xmm2=(GHIJKLMN)
      punpcklbw   xmm3, xmm6              ; xmm3=(OPQRSTUV)
      paddw       xmm2, xmm7
      paddw       xmm3, xmm7
  
      movdqa      XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
      movdqa      XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
      movdqa      XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
      movdqa      XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
  
      add         rsi, byte 4*SIZEOF_JSAMPROW
      add         rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
      dec         rcx
      jnz         short .convloop
  
      pop         rbx
      uncollect_args 3
      pop         rbp
      ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Quantize/descale the coefficients, and store into coef_block
  ;
  ; This implementation is based on an algorithm described in
  ;   "How to optimize for the Pentium family of microprocessors"
  ;   (http://www.agner.org/assem/).
  ;
  ; GLOBAL(void)
  ; jsimd_quantize_sse2(JCOEFPTR coef_block, DCTELEM *divisors,
  ;                     DCTELEM *workspace);
  ;
  
  %define RECIPROCAL(m, n, b) \
    XMMBLOCK(DCTSIZE * 0 + (m), (n), (b), SIZEOF_DCTELEM)
  %define CORRECTION(m, n, b) \
    XMMBLOCK(DCTSIZE * 1 + (m), (n), (b), SIZEOF_DCTELEM)
  %define SCALE(m, n, b) \
    XMMBLOCK(DCTSIZE * 2 + (m), (n), (b), SIZEOF_DCTELEM)
  
  ; r10 = JCOEFPTR coef_block
  ; r11 = DCTELEM *divisors
  ; r12 = DCTELEM *workspace
  
      align       32
      GLOBAL_FUNCTION(jsimd_quantize_sse2)
  
  EXTN(jsimd_quantize_sse2):
      push        rbp
      mov         rbp, rsp
      collect_args 3
  
      mov         rsi, r12
      mov         rdx, r11
      mov         rdi, r10
      mov         rax, DCTSIZE2/32
  .quantloop:
      movdqa      xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
      movdqa      xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
      movdqa      xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
      movdqa      xmm7, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_DCTELEM)]
      movdqa      xmm0, xmm4
      movdqa      xmm1, xmm5
      movdqa      xmm2, xmm6
      movdqa      xmm3, xmm7
      psraw       xmm4, (WORD_BIT-1)
      psraw       xmm5, (WORD_BIT-1)
      psraw       xmm6, (WORD_BIT-1)
      psraw       xmm7, (WORD_BIT-1)
      pxor        xmm0, xmm4
      pxor        xmm1, xmm5
      pxor        xmm2, xmm6
      pxor        xmm3, xmm7
      psubw       xmm0, xmm4              ; if (xmm0 < 0) xmm0 = -xmm0;
      psubw       xmm1, xmm5              ; if (xmm1 < 0) xmm1 = -xmm1;
      psubw       xmm2, xmm6              ; if (xmm2 < 0) xmm2 = -xmm2;
      psubw       xmm3, xmm7              ; if (xmm3 < 0) xmm3 = -xmm3;
  
      paddw       xmm0, XMMWORD [CORRECTION(0,0,rdx)]  ; correction + roundfactor
      paddw       xmm1, XMMWORD [CORRECTION(1,0,rdx)]
      paddw       xmm2, XMMWORD [CORRECTION(2,0,rdx)]
      paddw       xmm3, XMMWORD [CORRECTION(3,0,rdx)]
      pmulhuw     xmm0, XMMWORD [RECIPROCAL(0,0,rdx)]  ; reciprocal
      pmulhuw     xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
      pmulhuw     xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
      pmulhuw     xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
      pmulhuw     xmm0, XMMWORD [SCALE(0,0,rdx)]       ; scale
      pmulhuw     xmm1, XMMWORD [SCALE(1,0,rdx)]
      pmulhuw     xmm2, XMMWORD [SCALE(2,0,rdx)]
      pmulhuw     xmm3, XMMWORD [SCALE(3,0,rdx)]
  
      pxor        xmm0, xmm4
      pxor        xmm1, xmm5
      pxor        xmm2, xmm6
      pxor        xmm3, xmm7
      psubw       xmm0, xmm4
      psubw       xmm1, xmm5
      psubw       xmm2, xmm6
      psubw       xmm3, xmm7
      movdqa      XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
      movdqa      XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
      movdqa      XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
      movdqa      XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
  
      add         rsi, byte 32*SIZEOF_DCTELEM
      add         rdx, byte 32*SIZEOF_DCTELEM
      add         rdi, byte 32*SIZEOF_JCOEF
      dec         rax
      jnz         near .quantloop
  
      uncollect_args 3
      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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