kc3-lang/libjpeg-turbo/simd/jcsample-mmx.asm

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• Hash : 123f7258
  Author :
  Date : 2016-05-24T10:23:56
  

  Format copyright headers more consistently
  
  The IJG convention is to format copyright notices as:
  
  Copyright (C) YYYY, Owner.
  
  We try to maintain this convention for any code that is part of the
  libjpeg API library (with the exception of preserving the copyright
  notices from Cendio's code verbatim, since those predate
  libjpeg-turbo.)
  
  Note that the phrase "All Rights Reserved" is no longer necessary, since
  all Buenos Aires Convention signatories signed onto the Berne Convention
  in 2000.  However, our convention is to retain this phrase for any files
  that have a self-contained copyright header but to leave it off of any
  files that refer to another file for conditions of distribution and use.
  For instance, all of the non-SIMD files in the libjpeg API library refer
  to README.ijg, and the copyright message in that file contains "All
  Rights Reserved", so it is unnecessary to add it to the individual
  files.
  
  The TurboJPEG code retains my preferred formatting convention for
  copyright notices, which is based on that of VirtualGL (where the
  TurboJPEG API originated.)
  

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• simd/jcsample-mmx.asm

• ;
  ; jcsample.asm - downsampling (MMX)
  ;
  ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  ;
  ; 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
  ;
  ; [TAB8]
  
  %include "jsimdext.inc"
  
  ; --------------------------------------------------------------------------
          SECTION SEG_TEXT
          BITS    32
  ;
  ; Downsample pixel values of a single component.
  ; This version handles the common case of 2:1 horizontal and 1:1 vertical,
  ; without smoothing.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v1_downsample_mmx (JDIMENSION image_width, int max_v_samp_factor,
  ;                            JDIMENSION v_samp_factor, JDIMENSION width_blocks,
  ;                            JSAMPARRAY input_data, JSAMPARRAY output_data);
  ;
  
  %define img_width(b)    (b)+8           ; JDIMENSION image_width
  %define max_v_samp(b)   (b)+12          ; int max_v_samp_factor
  %define v_samp(b)       (b)+16          ; JDIMENSION v_samp_factor
  %define width_blks(b)   (b)+20          ; JDIMENSION width_blocks
  %define input_data(b)   (b)+24          ; JSAMPARRAY input_data
  %define output_data(b)  (b)+28          ; JSAMPARRAY output_data
  
          align   16
          global  EXTN(jsimd_h2v1_downsample_mmx)
  
  EXTN(jsimd_h2v1_downsample_mmx):
          push    ebp
          mov     ebp,esp
  ;       push    ebx             ; unused
  ;       push    ecx             ; need not be preserved
  ;       push    edx             ; need not be preserved
          push    esi
          push    edi
  
          mov     ecx, JDIMENSION [width_blks(ebp)]
          shl     ecx,3                   ; imul ecx,DCTSIZE (ecx = output_cols)
          jz      near .return
  
          mov     edx, JDIMENSION [img_width(ebp)]
  
          ; -- expand_right_edge
  
          push    ecx
          shl     ecx,1                           ; output_cols * 2
          sub     ecx,edx
          jle     short .expand_end
  
          mov     eax, INT [max_v_samp(ebp)]
          test    eax,eax
          jle     short .expand_end
  
          cld
          mov     esi, JSAMPARRAY [input_data(ebp)]       ; input_data
          alignx  16,7
  .expandloop:
          push    eax
          push    ecx
  
          mov     edi, JSAMPROW [esi]
          add     edi,edx
          mov     al, JSAMPLE [edi-1]
  
          rep stosb
  
          pop     ecx
          pop     eax
  
          add     esi, byte SIZEOF_JSAMPROW
          dec     eax
          jg      short .expandloop
  
  .expand_end:
          pop     ecx                             ; output_cols
  
          ; -- h2v1_downsample
  
          mov     eax, JDIMENSION [v_samp(ebp)]   ; rowctr
          test    eax,eax
          jle     near .return
  
          mov       edx, 0x00010000       ; bias pattern
          movd      mm7,edx
          pcmpeqw   mm6,mm6
          punpckldq mm7,mm7               ; mm7={0, 1, 0, 1}
          psrlw     mm6,BYTE_BIT          ; mm6={0xFF 0x00 0xFF 0x00 ..}
  
          mov     esi, JSAMPARRAY [input_data(ebp)]       ; input_data
          mov     edi, JSAMPARRAY [output_data(ebp)]      ; output_data
          alignx  16,7
  .rowloop:
          push    ecx
          push    edi
          push    esi
  
          mov     esi, JSAMPROW [esi]             ; inptr
          mov     edi, JSAMPROW [edi]             ; outptr
          alignx  16,7
  .columnloop:
  
          movq    mm0, MMWORD [esi+0*SIZEOF_MMWORD]
          movq    mm1, MMWORD [esi+1*SIZEOF_MMWORD]
          movq    mm2,mm0
          movq    mm3,mm1
  
          pand    mm0,mm6
          psrlw   mm2,BYTE_BIT
          pand    mm1,mm6
          psrlw   mm3,BYTE_BIT
  
          paddw   mm0,mm2
          paddw   mm1,mm3
          paddw   mm0,mm7
          paddw   mm1,mm7
          psrlw   mm0,1
          psrlw   mm1,1
  
          packuswb mm0,mm1
  
          movq    MMWORD [edi+0*SIZEOF_MMWORD], mm0
  
          add     esi, byte 2*SIZEOF_MMWORD       ; inptr
          add     edi, byte 1*SIZEOF_MMWORD       ; outptr
          sub     ecx, byte SIZEOF_MMWORD         ; outcol
          jnz     short .columnloop
  
          pop     esi
          pop     edi
          pop     ecx
  
          add     esi, byte SIZEOF_JSAMPROW       ; input_data
          add     edi, byte SIZEOF_JSAMPROW       ; output_data
          dec     eax                             ; rowctr
          jg      short .rowloop
  
          emms            ; empty MMX state
  
  .return:
          pop     edi
          pop     esi
  ;       pop     edx             ; need not be preserved
  ;       pop     ecx             ; need not be preserved
  ;       pop     ebx             ; unused
          pop     ebp
          ret
  
  ; --------------------------------------------------------------------------
  ;
  ; Downsample pixel values of a single component.
  ; This version handles the standard case of 2:1 horizontal and 2:1 vertical,
  ; without smoothing.
  ;
  ; GLOBAL(void)
  ; jsimd_h2v2_downsample_mmx (JDIMENSION image_width, int max_v_samp_factor,
  ;                            JDIMENSION v_samp_factor, JDIMENSION width_blocks,
  ;                            JSAMPARRAY input_data, JSAMPARRAY output_data);
  ;
  
  %define img_width(b)    (b)+8           ; JDIMENSION image_width
  %define max_v_samp(b)   (b)+12          ; int max_v_samp_factor
  %define v_samp(b)       (b)+16          ; JDIMENSION v_samp_factor
  %define width_blks(b)   (b)+20          ; JDIMENSION width_blocks
  %define input_data(b)   (b)+24          ; JSAMPARRAY input_data
  %define output_data(b)  (b)+28          ; JSAMPARRAY output_data
  
          align   16
          global  EXTN(jsimd_h2v2_downsample_mmx)
  
  EXTN(jsimd_h2v2_downsample_mmx):
          push    ebp
          mov     ebp,esp
  ;       push    ebx             ; unused
  ;       push    ecx             ; need not be preserved
  ;       push    edx             ; need not be preserved
          push    esi
          push    edi
  
          mov     ecx, JDIMENSION [width_blks(ebp)]
          shl     ecx,3                   ; imul ecx,DCTSIZE (ecx = output_cols)
          jz      near .return
  
          mov     edx, JDIMENSION [img_width(ebp)]
  
          ; -- expand_right_edge
  
          push    ecx
          shl     ecx,1                           ; output_cols * 2
          sub     ecx,edx
          jle     short .expand_end
  
          mov     eax, INT [max_v_samp(ebp)]
          test    eax,eax
          jle     short .expand_end
  
          cld
          mov     esi, JSAMPARRAY [input_data(ebp)]       ; input_data
          alignx  16,7
  .expandloop:
          push    eax
          push    ecx
  
          mov     edi, JSAMPROW [esi]
          add     edi,edx
          mov     al, JSAMPLE [edi-1]
  
          rep stosb
  
          pop     ecx
          pop     eax
  
          add     esi, byte SIZEOF_JSAMPROW
          dec     eax
          jg      short .expandloop
  
  .expand_end:
          pop     ecx                             ; output_cols
  
          ; -- h2v2_downsample
  
          mov     eax, JDIMENSION [v_samp(ebp)]   ; rowctr
          test    eax,eax
          jle     near .return
  
          mov       edx, 0x00020001       ; bias pattern
          movd      mm7,edx
          pcmpeqw   mm6,mm6
          punpckldq mm7,mm7               ; mm7={1, 2, 1, 2}
          psrlw     mm6,BYTE_BIT          ; mm6={0xFF 0x00 0xFF 0x00 ..}
  
          mov     esi, JSAMPARRAY [input_data(ebp)]       ; input_data
          mov     edi, JSAMPARRAY [output_data(ebp)]      ; output_data
          alignx  16,7
  .rowloop:
          push    ecx
          push    edi
          push    esi
  
          mov     edx, JSAMPROW [esi+0*SIZEOF_JSAMPROW]   ; inptr0
          mov     esi, JSAMPROW [esi+1*SIZEOF_JSAMPROW]   ; inptr1
          mov     edi, JSAMPROW [edi]                     ; outptr
          alignx  16,7
  .columnloop:
  
          movq    mm0, MMWORD [edx+0*SIZEOF_MMWORD]
          movq    mm1, MMWORD [esi+0*SIZEOF_MMWORD]
          movq    mm2, MMWORD [edx+1*SIZEOF_MMWORD]
          movq    mm3, MMWORD [esi+1*SIZEOF_MMWORD]
  
          movq    mm4,mm0
          movq    mm5,mm1
          pand    mm0,mm6
          psrlw   mm4,BYTE_BIT
          pand    mm1,mm6
          psrlw   mm5,BYTE_BIT
          paddw   mm0,mm4
          paddw   mm1,mm5
  
          movq    mm4,mm2
          movq    mm5,mm3
          pand    mm2,mm6
          psrlw   mm4,BYTE_BIT
          pand    mm3,mm6
          psrlw   mm5,BYTE_BIT
          paddw   mm2,mm4
          paddw   mm3,mm5
  
          paddw   mm0,mm1
          paddw   mm2,mm3
          paddw   mm0,mm7
          paddw   mm2,mm7
          psrlw   mm0,2
          psrlw   mm2,2
  
          packuswb mm0,mm2
  
          movq    MMWORD [edi+0*SIZEOF_MMWORD], mm0
  
          add     edx, byte 2*SIZEOF_MMWORD       ; inptr0
          add     esi, byte 2*SIZEOF_MMWORD       ; inptr1
          add     edi, byte 1*SIZEOF_MMWORD       ; outptr
          sub     ecx, byte SIZEOF_MMWORD         ; outcol
          jnz     near .columnloop
  
          pop     esi
          pop     edi
          pop     ecx
  
          add     esi, byte 2*SIZEOF_JSAMPROW     ; input_data
          add     edi, byte 1*SIZEOF_JSAMPROW     ; output_data
          dec     eax                             ; rowctr
          jg      near .rowloop
  
          emms            ; empty MMX state
  
  .return:
          pop     edi
          pop     esi
  ;       pop     edx             ; need not be preserved
  ;       pop     ecx             ; need not be preserved
  ;       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   16
  

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