;

;

; 	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