1 ; RUN: llc -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck %s 2 3 ; C code this came from 4 ;bool cas(float volatile *p, float *expected, float desired) { 5 ; bool success; 6 ; __asm__ __volatile__("lock; cmpxchg %[desired], %[mem]; " 7 ; "mov %[expected], %[expected_out]; " 8 ; "sete %[success]" 9 ; : [success] "=a" (success), 10 ; [expected_out] "=rm" (*expected) 11 ; : [expected] "a" (*expected), 12 ; [desired] "q" (desired), 13 ; [mem] "m" (*p) 14 ; : "memory", "cc"); 15 ; return success; 16 ;} 17 18 define zeroext i1 @cas(float* %p, float* %expected, float %desired) nounwind { 19 entry: 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 36 ret i1 %tobool 37 } 38 39 ; CHECK: @cas 40 ; Make sure we're emitting a move from eax. 41 ; CHECK: #APP 42 ; CHECK-NEXT: lock;{{.*}}mov %eax,{{.*}} 43 ; CHECK-NEXT: #NO_APP 44 45 define zeroext i1 @cas2(i8* %p, i8* %expected, i1 zeroext %desired) nounwind { 46 entry: 47 %p.addr = alloca i8*, align 8 48 %expected.addr = alloca i8*, align 8 49 %desired.addr = alloca i8, align 1 50 %success = alloca i8, align 1 51 store i8* %p, i8** %p.addr, align 8 52 store i8* %expected, i8** %expected.addr, align 8 53 %frombool = zext i1 %desired to i8 54 store i8 %frombool, i8* %desired.addr, align 1 55 %0 = load i8** %expected.addr, align 8 56 %1 = load i8** %expected.addr, align 8 57 %2 = load i8* %1, align 1 58 %tobool = trunc i8 %2 to i1 59 %3 = load i8* %desired.addr, align 1 60 %tobool1 = trunc i8 %3 to i1 61 %4 = load i8** %p.addr, align 8 62 %5 = call i8 asm sideeffect "lock; cmpxchg $3, $4; mov $2, $1; sete $0", "={ax},=*rm,{ax},q,*m,~{memory},~{cc},~{dirflag},~{fpsr},~{flags}"(i8* %0, i1 %tobool, i1 %tobool1, i8* %4) nounwind 63 store i8 %5, i8* %success, align 1 64 %6 = load i8* %success, align 1 65 %tobool2 = trunc i8 %6 to i1 66 ret i1 %tobool2 67 } 68 69 ; CHECK: @cas2 70 ; Make sure we're emitting a move from %al here. 71 ; CHECK: #APP 72 ; CHECK-NEXT: lock;{{.*}}mov %al,{{.*}} 73 ; CHECK-NEXT: #NO_APP 74
