kc3-lang/libjpeg-turbo/simd/jsimdcpu.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/jsimdcpu.asm

• ;
  ; jsimdcpu.asm - SIMD instruction support check
  ;
  ; 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
  ;
  ; Check if the CPU supports SIMD instructions
  ;
  ; GLOBAL(unsigned int)
  ; jpeg_simd_cpu_support (void)
  ;
  
          align   16
          global  EXTN(jpeg_simd_cpu_support)
  
  EXTN(jpeg_simd_cpu_support):
          push    ebx
  ;       push    ecx             ; need not be preserved
  ;       push    edx             ; need not be preserved
  ;       push    esi             ; unused
          push    edi
  
          xor     edi,edi                 ; simd support flag
  
          pushfd
          pop     eax
          mov     edx,eax
          xor     eax, 1<<21              ; flip ID bit in EFLAGS
          push    eax
          popfd
          pushfd
          pop     eax
          xor     eax,edx
          jz      short .return           ; CPUID is not supported
  
          ; Check for MMX instruction support
          xor     eax,eax
          cpuid
          test    eax,eax
          jz      short .return
  
          xor     eax,eax
          inc     eax
          cpuid
          mov     eax,edx                 ; eax = Standard feature flags
  
          test    eax, 1<<23              ; bit23:MMX
          jz      short .no_mmx
          or      edi, byte JSIMD_MMX
  .no_mmx:
          test    eax, 1<<25              ; bit25:SSE
          jz      short .no_sse
          or      edi, byte JSIMD_SSE
  .no_sse:
          test    eax, 1<<26              ; bit26:SSE2
          jz      short .no_sse2
          or      edi, byte JSIMD_SSE2
  .no_sse2:
  
          ; Check for 3DNow! instruction support
          mov     eax, 0x80000000
          cpuid
          cmp     eax, 0x80000000
          jbe     short .return
  
          mov     eax, 0x80000001
          cpuid
          mov     eax,edx                 ; eax = Extended feature flags
  
          test    eax, 1<<31              ; bit31:3DNow!(vendor independent)
          jz      short .no_3dnow
          or      edi, byte JSIMD_3DNOW
  .no_3dnow:
  
  .return:
          mov     eax,edi
  
          pop     edi
  ;       pop     esi             ; unused
  ;       pop     edx             ; need not be preserved
  ;       pop     ecx             ; need not be preserved
          pop     ebx
          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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