mirror of
https://bitbucket.org/CPMADevs/cnq3
synced 2024-11-29 15:22:26 +00:00
fc9465caab
aside from the speed improvements, this also makes for nicer code in the renderer interaction with libjpeg, thanks to mem_dest support etc
104 lines
2.9 KiB
NASM
104 lines
2.9 KiB
NASM
;
|
|
; 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
|