kc3-lang/libjpeg-turbo/simd/i386/jquanti-sse2.asm

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• Hash : 5e27ca23
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  Date : 2025-09-19T14:21:49
  

  x86: Reformat NASM code to improve readability
  
  (and simplify the checkstyle script)
  

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• simd/i386/jquanti-sse2.asm

• ;
  ; Sample data conversion and quantization (32-bit SSE2)
  ;
  ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  ; Copyright (C) 2016, 2024-2025, D. R. Commander.
  ;
  ; 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"
  %include "jdct.inc"
  
  ; --------------------------------------------------------------------------
      SECTION     SEG_TEXT
      BITS        32
  
  ; Load data into workspace, applying unsigned->signed conversion
  ;
  ; GLOBAL(void)
  ; jsimd_convsamp_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
  ;                     DCTELEM *workspace)
  
  %define sample_data  ebp + 8            ; JSAMPARRAY sample_data
  %define start_col    ebp + 12           ; JDIMENSION start_col
  %define workspace    ebp + 16           ; DCTELEM *workspace
  
      align       32
      GLOBAL_FUNCTION(jsimd_convsamp_sse2)
  
  EXTN(jsimd_convsamp_sse2):
      push        ebp
      mov         ebp, esp
      push        ebx
  ;   push        ecx                     ; need not be preserved
  ;   push        edx                     ; need not be preserved
      push        esi
      push        edi
  
      pxor        xmm6, xmm6              ; xmm6 = (all 0's)
      pcmpeqw     xmm7, xmm7
      psllw       xmm7, 7             ; xmm7 = { 0xFF80 0xFF80 0xFF80 0xFF80 .. }
  
      mov         esi, JSAMPARRAY [sample_data]  ; (JSAMPROW *)
      mov         eax, JDIMENSION [start_col]
      mov         edi, POINTER [workspace]       ; (DCTELEM *)
      mov         ecx, DCTSIZE / 4
      ALIGNX      16, 7
  .convloop:
      mov         ebx, JSAMPROW [esi + 0 * SIZEOF_JSAMPROW]  ; (JSAMPLE *)
      mov         edx, JSAMPROW [esi + 1 * SIZEOF_JSAMPROW]  ; (JSAMPLE *)
  
      movq        xmm0, XMM_MMWORD [ebx + eax * SIZEOF_JSAMPLE]
                  ; xmm0 = (01234567)
      movq        xmm1, XMM_MMWORD [edx + eax * SIZEOF_JSAMPLE]
                  ; xmm1 = (89abcdef)
  
      mov         ebx, JSAMPROW [esi + 2 * SIZEOF_JSAMPROW]  ; (JSAMPLE *)
      mov         edx, JSAMPROW [esi + 3 * SIZEOF_JSAMPROW]  ; (JSAMPLE *)
  
      movq        xmm2, XMM_MMWORD [ebx + eax * SIZEOF_JSAMPLE]
                  ; xmm2 = (ghijklmn)
      movq        xmm3, XMM_MMWORD [edx + eax * 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, edi, SIZEOF_DCTELEM)], xmm0
      movdqa      XMMWORD [XMMBLOCK(1, 0, edi, SIZEOF_DCTELEM)], xmm1
      movdqa      XMMWORD [XMMBLOCK(2, 0, edi, SIZEOF_DCTELEM)], xmm2
      movdqa      XMMWORD [XMMBLOCK(3, 0, edi, SIZEOF_DCTELEM)], xmm3
  
      add         esi, byte 4 * SIZEOF_JSAMPROW
      add         edi, byte 4 * DCTSIZE * SIZEOF_DCTELEM
      dec         ecx
      jnz         short .convloop
  
      pop         edi
      pop         esi
  ;   pop         edx                     ; need not be preserved
  ;   pop         ecx                     ; need not be preserved
      pop         ebx
      pop         ebp
      ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Quantize/descale the coefficients, and store into coef_block
  ;
  ; This implementation is based on an algorithm described in
  ;   "Optimizing subroutines in assembly language:
  ;   An optimization guide for x86 platforms" (https://agner.org/optimize).
  ;
  ; 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)
  
  %define coef_block  ebp + 8             ; JCOEFPTR coef_block
  %define divisors    ebp + 12            ; DCTELEM *divisors
  %define workspace   ebp + 16            ; DCTELEM *workspace
  
      align       32
      GLOBAL_FUNCTION(jsimd_quantize_sse2)
  
  EXTN(jsimd_quantize_sse2):
      push        ebp
      mov         ebp, esp
  ;   push        ebx                     ; unused
  ;   push        ecx                     ; unused
  ;   push        edx                     ; need not be preserved
      push        esi
      push        edi
  
      mov         esi, POINTER [workspace]
      mov         edx, POINTER [divisors]
      mov         edi, JCOEFPTR [coef_block]
      mov         eax, DCTSIZE2 / 32
      ALIGNX      16, 7
  .quantloop:
      movdqa      xmm4, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_DCTELEM)]
      movdqa      xmm5, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_DCTELEM)]
      movdqa      xmm6, XMMWORD [XMMBLOCK(2, 0, esi, SIZEOF_DCTELEM)]
      movdqa      xmm7, XMMWORD [XMMBLOCK(3, 0, esi, 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, edx)]
                  ; correction + roundfactor
      paddw       xmm1, XMMWORD [CORRECTION(1, 0, edx)]
      paddw       xmm2, XMMWORD [CORRECTION(2, 0, edx)]
      paddw       xmm3, XMMWORD [CORRECTION(3, 0, edx)]
      pmulhuw     xmm0, XMMWORD [RECIPROCAL(0, 0, edx)]  ; reciprocal
      pmulhuw     xmm1, XMMWORD [RECIPROCAL(1, 0, edx)]
      pmulhuw     xmm2, XMMWORD [RECIPROCAL(2, 0, edx)]
      pmulhuw     xmm3, XMMWORD [RECIPROCAL(3, 0, edx)]
      pmulhuw     xmm0, XMMWORD [SCALE(0, 0, edx)]       ; scale
      pmulhuw     xmm1, XMMWORD [SCALE(1, 0, edx)]
      pmulhuw     xmm2, XMMWORD [SCALE(2, 0, edx)]
      pmulhuw     xmm3, XMMWORD [SCALE(3, 0, edx)]
  
      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, edi, SIZEOF_DCTELEM)], xmm0
      movdqa      XMMWORD [XMMBLOCK(1, 0, edi, SIZEOF_DCTELEM)], xmm1
      movdqa      XMMWORD [XMMBLOCK(2, 0, edi, SIZEOF_DCTELEM)], xmm2
      movdqa      XMMWORD [XMMBLOCK(3, 0, edi, SIZEOF_DCTELEM)], xmm3
  
      add         esi, byte 32 * SIZEOF_DCTELEM
      add         edx, byte 32 * SIZEOF_DCTELEM
      add         edi, byte 32 * SIZEOF_JCOEF
      dec         eax
      jnz         near .quantloop
  
      pop         edi
      pop         esi
  ;   pop         edx                     ; need not be preserved
  ;   pop         ecx                     ; unused
  ;   pop         ebx                     ; unused
      pop         ebp
      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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