kc3-lang/libjpeg-turbo/simd/jsimdcpu-64.asm

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• Hash : 2cf199cb
  Author :
  Date : 2016-05-20T10:45:32
  

  Lay the groundwork for 64-bit AVX2 SIMD support
  

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• simd/jsimdcpu-64.asm

• ;
  ; jsimdcpu-64.asm - SIMD instruction support check
  ;
  ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  ; Copyright (C) 2016, D. R. Commander.
  ;
  ; Based on
  ; 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    64
  ;
  ; Check if the CPU supports SIMD instructions
  ;
  ; GLOBAL(unsigned int)
  ; jpeg_simd_cpu_support (void)
  ;
  
          align   32
          global  EXTN(jpeg_simd_cpu_support)
  
  EXTN(jpeg_simd_cpu_support):
          push    rbx
          push    rdi
  
          xor     rdi,rdi                 ; simd support flag
  
          ; Check for AVX2 instruction support
          mov     rax, 7
          xor     rcx,rcx
          cpuid
          mov     rax,rbx                 ; rax = Extended feature flags
  
          or      rdi, JSIMD_SSE2
          or      rdi, JSIMD_SSE
          test    rax, 1<<5               ; bit5:AVX2
          jz      short .return
          or      rdi, JSIMD_AVX2
  
  .return:
          mov     rax,rdi
  
          pop     rdi
          pop     rbx
          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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