tools/debugserver/source/MacOSX/HasAVX.s

//===-- HasAVX.s ---------------------------------------*- x86 Assembly -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#if defined (__i386__) || defined (__x86_64__)

.globl _HasAVX

_HasAVX:
#if defined (__x86_64__)
    pushq %rbp
    movq %rsp, %rbp
    pushq %rbx
#else
    pushl %ebp
    movl %esp, %ebp
    pushl %ebx
#endif
    mov $1, %eax
    cpuid                                                                       // clobbers ebx
    and $0x018000000, %ecx
    cmp $0x018000000, %ecx
    jne not_supported
    mov $0, %ecx
.byte 0x0f, 0x01, 0xd0    // xgetbv, for those assemblers that don't know it
    and $0x06, %eax
    cmp $0x06, %eax
    jne not_supported
    mov $1, %eax
    jmp done
not_supported:
    mov $0, %eax
done:
#if defined (__x86_64__)
    popq %rbx
    movq %rbp, %rsp
    popq %rbp
#else
    popl %ebx
    movl %ebp, %esp
    popl %ebp
#endif
    ret                                                                         // return

#endif