| ; RUN: llc -mtriple=x86_64-pc-linux-gnu %s -o - -no-integrated-as | FileCheck %s |
| |
| ; C code this came from |
| ;bool cas(float volatile *p, ptr expected, float desired) { |
| ; bool success; |
| ; __asm__ __volatile__("lock; cmpxchg %[desired], %[mem]; " |
| ; "mov %[expected], %[expected_out]; " |
| ; "sete %[success]" |
| ; : [success] "=a" (success), |
| ; [expected_out] "=rm" (*expected) |
| ; : [expected] "a" (*expected), |
| ; [desired] "q" (desired), |
| ; [mem] "m" (*p) |
| ; : "memory", "cc"); |
| ; return success; |
| ;} |
| |
| define zeroext i1 @cas(ptr %p, ptr %expected, float %desired) nounwind { |
| entry: |
| %p.addr = alloca ptr, align 8 |
| %expected.addr = alloca ptr, align 8 |
| %desired.addr = alloca float, align 4 |
| %success = alloca i8, align 1 |
| store ptr %p, ptr %p.addr, align 8 |
| store ptr %expected, ptr %expected.addr, align 8 |
| store float %desired, ptr %desired.addr, align 4 |
| %0 = load ptr, ptr %expected.addr, align 8 |
| %1 = load ptr, ptr %expected.addr, align 8 |
| %2 = load float, ptr %1, align 4 |
| %3 = load float, ptr %desired.addr, align 4 |
| %4 = load ptr, ptr %p.addr, align 8 |
| %5 = call i8 asm sideeffect "lock; cmpxchg $3, $4; mov $2, $1; sete $0", "={ax},=*rm,{ax},q,*m,~{memory},~{cc},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(float) %0, float %2, float %3, ptr elementtype(float) %4) nounwind |
| store i8 %5, ptr %success, align 1 |
| %6 = load i8, ptr %success, align 1 |
| %tobool = trunc i8 %6 to i1 |
| ret i1 %tobool |
| } |
| |
| ; CHECK: @cas |
| ; Make sure we're emitting a move from eax. |
| ; CHECK: #APP |
| ; CHECK-NEXT: lock;{{.*}}mov %eax,{{.*}} |
| ; CHECK-NEXT: #NO_APP |
| |
| define zeroext i1 @cas2(ptr %p, ptr %expected, i1 zeroext %desired) nounwind { |
| entry: |
| %p.addr = alloca ptr, align 8 |
| %expected.addr = alloca ptr, align 8 |
| %desired.addr = alloca i8, align 1 |
| %success = alloca i8, align 1 |
| store ptr %p, ptr %p.addr, align 8 |
| store ptr %expected, ptr %expected.addr, align 8 |
| %frombool = zext i1 %desired to i8 |
| store i8 %frombool, ptr %desired.addr, align 1 |
| %0 = load ptr, ptr %expected.addr, align 8 |
| %1 = load ptr, ptr %expected.addr, align 8 |
| %2 = load i8, ptr %1, align 1 |
| %tobool = trunc i8 %2 to i1 |
| %3 = load i8, ptr %desired.addr, align 1 |
| %tobool1 = trunc i8 %3 to i1 |
| %4 = load ptr, ptr %p.addr, align 8 |
| %5 = call i8 asm sideeffect "lock; cmpxchg $3, $4; mov $2, $1; sete $0", "={ax},=*rm,{ax},q,*m,~{memory},~{cc},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i8) %0, i1 %tobool, i1 %tobool1, ptr elementtype(i8) %4) nounwind |
| store i8 %5, ptr %success, align 1 |
| %6 = load i8, ptr %success, align 1 |
| %tobool2 = trunc i8 %6 to i1 |
| ret i1 %tobool2 |
| } |
| |
| ; CHECK: @cas2 |
| ; Make sure we're emitting a move from %al here. |
| ; CHECK: #APP |
| ; CHECK-NEXT: lock;{{.*}}mov %al,{{.*}} |
| ; CHECK-NEXT: #NO_APP |