1 //===-- HasAVX.s ---------------------------------------*- x86 Assembly -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #if defined (__i386__) || defined (__x86_64__) 11 12 .globl _HasAVX 13 14 _HasAVX: 15 #if defined (__x86_64__) 16 pushq %rbp 17 movq %rsp, %rbp 18 pushq %rbx 19 #else 20 pushl %ebp 21 movl %esp, %ebp 22 pushl %ebx 23 #endif 24 mov $1, %eax 25 cpuid // clobbers ebx 26 and $0x018000000, %ecx 27 cmp $0x018000000, %ecx 28 jne not_supported 29 mov $0, %ecx 30 .byte 0x0f, 0x01, 0xd0 // xgetbv, for those assemblers that don't know it 31 and $0x06, %eax 32 cmp $0x06, %eax 33 jne not_supported 34 mov $1, %eax 35 jmp done 36 not_supported: 37 mov $0, %eax 38 done: 39 #if defined (__x86_64__) 40 popq %rbx 41 movq %rbp, %rsp 42 popq %rbp 43 #else 44 popl %ebx 45 movl %ebp, %esp 46 popl %ebp 47 #endif 48 ret // return 49 50 #endif
