have_mmx.s

来自「linux下电话本所依赖的一些图形库」· S 代码 · 共 59 行

	.file	"have_mmx.S"
	.version	"01.01"
gcc2_compiled.:
.text
	.align 16

#if !defined(__MINGW32__) && !defined(__CYGWIN__)	

/* Magic indicating no need for an executable stack */
#if !defined __powerpc64__ && !defined __ia64__
.section .note.GNU-stack;  .previous
#endif
	
.globl _pixops_have_mmx
	.type	 _pixops_have_mmx,@function
_pixops_have_mmx:

#else

.globl __pixops_have_mmx
__pixops_have_mmx:

#endif
	
	push	%ebx

# Check if bit 21 in flags word is writeable

	pushfl	
	popl	%eax
	movl	%eax,%ebx
	xorl	$0x00200000, %eax
	pushl   %eax
	popfl
	pushfl
	popl	%eax

	cmpl	%eax, %ebx

	je .notfound

# OK, we have CPUID

	movl	$1, %eax
	cpuid
	
	test	$0x00800000, %edx
	jz	.notfound

	movl	$1, %eax
	jmp	.out

.notfound:
	movl  	$0, %eax
.out:	
	popl	%ebx
	ret