1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
2; RUN: llc < %s -mtriple=x86_64-- -mattr=-sse -O0 | FileCheck %s
3; PR9675
4
5define i32 @t() {
6; CHECK-LABEL: t:
7; CHECK:       # %bb.0:
8; CHECK-NEXT:    movl $1, -{{[0-9]+}}(%rsp)
9; CHECK-NEXT:    mfence
10; CHECK-NEXT:    lock decl -{{[0-9]+}}(%rsp)
11; CHECK-NEXT:    mfence
12; CHECK-NEXT:    xorl %eax, %eax
13; CHECK-NEXT:    retq
14  %i = alloca i32, align 4
15  store i32 1, i32* %i, align 4
16  fence seq_cst
17  %t0 = atomicrmw sub i32* %i, i32 1 monotonic
18  fence seq_cst
19  ret i32 0
20}
21