| ; |
| ; jsimdcpu.asm - SIMD instruction support check |
| ; |
| ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| ; Copyright (C) 2016, 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), |
| ; 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 |
| |
| %include "jsimdext.inc" |
| |
| ; -------------------------------------------------------------------------- |
| SECTION SEG_TEXT |
| BITS 32 |
| ; |
| ; Check if the CPU supports SIMD instructions |
| ; |
| ; GLOBAL(unsigned int) |
| ; jpeg_simd_cpu_support(void) |
| ; |
| |
| align 32 |
| GLOBAL_FUNCTION(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 near .return ; CPUID is not supported |
| |
| ; Check whether CPUID leaf 07H is supported |
| ; (leaf 07H is used to check for AVX2 instruction support) |
| xor eax, eax |
| cpuid |
| test eax, eax |
| jz near .return |
| cmp eax, 7 |
| jl short .no_avx2 ; Maximum leaf < 07H |
| |
| ; Check for AVX2 instruction support |
| mov eax, 7 |
| xor ecx, ecx |
| cpuid |
| mov eax, ebx |
| test eax, 1<<5 ; bit5:AVX2 |
| jz short .no_avx2 |
| |
| ; Check for AVX2 O/S support |
| mov eax, 1 |
| xor ecx, ecx |
| cpuid |
| test ecx, 1<<27 |
| jz short .no_avx2 ; O/S does not support XSAVE |
| test ecx, 1<<28 |
| jz short .no_avx2 ; CPU does not support AVX2 |
| |
| xor ecx, ecx |
| xgetbv |
| and eax, 6 |
| cmp eax, 6 ; O/S does not manage XMM/YMM state |
| ; using XSAVE |
| jnz short .no_avx2 |
| |
| or edi, JSIMD_AVX2 |
| .no_avx2: |
| |
| ; Check CPUID leaf 01H for MMX, SSE, and SSE2 support |
| xor eax, eax |
| inc eax |
| cpuid |
| mov eax, edx ; eax = Standard feature flags |
| |
| ; Check for MMX instruction support |
| 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 32 |