1 ; RUN: llc -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck %s
3 ; C code this came from
4 ;bool cas(float volatile *p, float *expected, float desired) {
6 ; __asm__ __volatile__("lock; cmpxchg %[desired], %[mem]; "
7 ; "mov %[expected], %[expected_out]; "
9 ; : [success] "=a" (success),
10 ; [expected_out] "=rm" (*expected)
11 ; : [expected] "a" (*expected),
12 ; [desired] "q" (desired),
18 define zeroext i1 @cas(float* %p, float* %expected, float %desired) nounwind {
20 %p.addr = alloca float*, align 8
21 %expected.addr = alloca float*, align 8
22 %desired.addr = alloca float, align 4
23 %success = alloca i8, align 1
24 store float* %p, float** %p.addr, align 8
25 store float* %expected, float** %expected.addr, align 8
26 store float %desired, float* %desired.addr, align 4
27 %0 = load float** %expected.addr, align 8
28 %1 = load float** %expected.addr, align 8
29 %2 = load float* %1, align 4
30 %3 = load float* %desired.addr, align 4
31 %4 = load float** %p.addr, align 8
32 %5 = call i8 asm sideeffect "lock; cmpxchg $3, $4; mov $2, $1; sete $0", "={ax},=*rm,{ax},q,*m,~{memory},~{cc},~{dirflag},~{fpsr},~{flags}"(float* %0, float %2, float %3, float* %4) nounwind
33 store i8 %5, i8* %success, align 1
34 %6 = load i8* %success, align 1
35 %tobool = trunc i8 %6 to i1
39 ; Make sure we're emitting a move from eax.
41 ; CHECK-NEXT: lock;{{.*}}mov %eax,{{.*}}