зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
2.1 KiB
NASM
106 строки
2.1 KiB
NASM
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; jsimdcpu.asm - SIMD instruction support check
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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;
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; Based on
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; x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler),
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; can *not* be assembled with Microsoft's MASM or any compatible
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; assembler (including Borland's Turbo Assembler).
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; NASM is available from http://nasm.sourceforge.net/ or
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; http://sourceforge.net/project/showfiles.php?group_id=6208
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;
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; [TAB8]
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%include "jsimdext.inc"
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 32
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;
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; Check if the CPU supports SIMD instructions
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;
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; GLOBAL(unsigned int)
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; jpeg_simd_cpu_support (void)
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;
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align 16
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global EXTN(jpeg_simd_cpu_support)
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EXTN(jpeg_simd_cpu_support):
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push ebx
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; push ecx ; need not be preserved
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; push edx ; need not be preserved
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; push esi ; unused
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push edi
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xor edi,edi ; simd support flag
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pushfd
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pop eax
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mov edx,eax
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xor eax, 1<<21 ; flip ID bit in EFLAGS
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push eax
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popfd
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pushfd
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pop eax
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xor eax,edx
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jz short .return ; CPUID is not supported
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; Check for MMX instruction support
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xor eax,eax
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cpuid
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test eax,eax
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jz short .return
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xor eax,eax
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inc eax
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cpuid
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mov eax,edx ; eax = Standard feature flags
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test eax, 1<<23 ; bit23:MMX
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jz short .no_mmx
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or edi, byte JSIMD_MMX
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.no_mmx:
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test eax, 1<<25 ; bit25:SSE
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jz short .no_sse
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or edi, byte JSIMD_SSE
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.no_sse:
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test eax, 1<<26 ; bit26:SSE2
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jz short .no_sse2
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or edi, byte JSIMD_SSE2
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.no_sse2:
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; Check for 3DNow! instruction support
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000000
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jbe short .return
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mov eax, 0x80000001
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cpuid
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mov eax,edx ; eax = Extended feature flags
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test eax, 1<<31 ; bit31:3DNow!(vendor independent)
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jz short .no_3dnow
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or edi, byte JSIMD_3DNOW
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.no_3dnow:
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.return:
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mov eax,edi
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pop edi
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; pop esi ; unused
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; pop edx ; need not be preserved
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; pop ecx ; need not be preserved
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pop ebx
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ret
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; For some reason, the OS X linker does not honor the request to align the
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; segment unless we do this.
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align 16
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