mmxflags_asm.s

来自「This code is based on mpeg_play, availab」· S 代码 · 共 60 行

#if defined(i386) && defined(USE_MMX)

.data
	.align 16
	.type	 flags,@object
flags: .long 0

.text
	.align 4
.globl cpu_flags
	.type	 cpu_flags,@function
cpu_flags: 
        pushfl
        popl %eax

        movl %eax,%ecx

        xorl $0x040000,%eax
        pushl %eax

        popfl
        pushfl

        popl %eax
        xorl %ecx,%eax
        jz cpu_flags.L1   # Processor is 386

        pushl %ecx
        popfl

        movl %ecx,%eax
        xorl $0x200000,%eax

        pushl %eax
        popfl
        pushfl

        popl %eax
        xorl %ecx,%eax
        je cpu_flags.L1

        pusha

        movl $1,%eax
        cpuid

        movl %edx,flags

        popa

        movl flags,%eax

cpu_flags.L1: 
        ret
.Lfe1:
	.size	 cpu_flags,.Lfe1-cpu_flags

#endif /* i386 && USE_MMX */