;
;
; assembler routines to detect CPU-features
;
; MMX / 3DNow! / SSE / SSE2
;
; for the LAME project
; Frank Klemm, Robert Hegemann 2000-10-12
;
%include "nasm.h"
globaldef has_MMX_nasm
globaldef has_3DNow_nasm
globaldef has_SSE_nasm
globaldef has_SSE2_nasm
segment_code
testCPUID:
pushfd
pop eax
mov ecx,eax
xor eax,0x200000
push eax
popfd
pushfd
pop eax
cmp eax,ecx
ret
;---------------------------------------
; int has_MMX_nasm (void)
;---------------------------------------
has_MMX_nasm:
pushad
call testCPUID
jz return0 ; no CPUID command, so no MMX
mov eax,0x1
CPUID
test edx,0x800000
jz return0 ; no MMX support
jmp return1 ; MMX support
;---------------------------------------
; int has_SSE_nasm (void)
;---------------------------------------
has_SSE_nasm:
pushad
call testCPUID
jz return0 ; no CPUID command, so no SSE
mov eax,0x1
CPUID
test edx,0x02000000
jz return0 ; no SSE support
jmp return1 ; SSE support
;---------------------------------------
; int has_SSE2_nasm (void)
;---------------------------------------
has_SSE2_nasm:
pushad
call testCPUID
jz return0 ; no CPUID command, so no SSE2
mov eax,0x1
CPUID
test edx,0x04000000
jz return0 ; no SSE2 support
jmp return1 ; SSE2 support
;---------------------------------------
; int has_3DNow_nasm (void)
;---------------------------------------
has_3DNow_nasm:
pushad
call testCPUID
jz return0 ; no CPUID command, so no 3DNow!
mov eax,0x80000000
CPUID
cmp eax,0x80000000
jbe return0 ; no extended MSR(1), so no 3DNow!
mov eax,0x80000001
CPUID
test edx,0x80000000
jz return0 ; no 3DNow! support
; 3DNow! support
return1:
popad
xor eax,eax
inc eax
ret
return0:
popad
xor eax,eax
ret
end
root