1; RUN: llc < %s -mtriple=i386-apple-darwin -mcpu=corei7 | FileCheck %s
2; rdar://r7512579
3
4; PHI defs in the atomic loop should be used by the add / adc
5; instructions. They should not be dead.
6
7define void @t(i64* nocapture %p) nounwind ssp {
8entry:
9; CHECK-LABEL: t:
10; CHECK: movl ([[REG:%[a-z]+]]), %eax
11; CHECK: movl 4([[REG]]), %edx
12; CHECK: LBB0_1:
13; CHECK: movl %eax, %ebx
14; CHECK: addl {{%[a-z]+}}, %ebx
15; CHECK: movl %edx, %ecx
16; CHECK: adcl {{%[a-z]+}}, %ecx
17; CHECK: lock
18; CHECK-NEXT: cmpxchg8b ([[REG]])
19; CHECK-NEXT: jne
20  %0 = atomicrmw add i64* %p, i64 1 seq_cst
21  ret void
22}
23