1; RUN: llc < %s -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s
2
3define void @test_cmpxchg_weak(i32 *%addr, i32 %desired, i32 %new) {
4; CHECK-LABEL: test_cmpxchg_weak:
5; CHECK-NEXT: %bb.0:
6; CHECK-NEXT:     ldrex   [[LOADED:r[0-9]+]], [r0]
7; CHECK-NEXT:     cmp     [[LOADED]], r1
8; CHECK-NEXT:     bne     [[LDFAILBB:LBB[0-9]+_[0-9]+]]
9; CHECK-NEXT: %bb.1:
10; CHECK-NEXT:     dmb ish
11; CHECK-NEXT:     strex   [[SUCCESS:r[0-9]+]], r2, [r0]
12; CHECK-NEXT:     cmp     [[SUCCESS]], #0
13; CHECK-NEXT:     beq     [[SUCCESSBB:LBB[0-9]+_[0-9]+]]
14; CHECK-NEXT: %bb.2:
15; CHECK-NEXT:     str     r3, [r0]
16; CHECK-NEXT:     bx      lr
17; CHECK-NEXT: [[LDFAILBB]]:
18; CHECK-NEXT:     clrex
19; CHECK-NEXT:     str     r3, [r0]
20; CHECK-NEXT:     bx      lr
21; CHECK-NEXT: [[SUCCESSBB]]:
22; CHECK-NEXT:     dmb     ish
23; CHECK-NEXT:     str     r3, [r0]
24; CHECK-NEXT:     bx      lr
25;
26  %pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic
27  %oldval = extractvalue { i32, i1 } %pair, 0
28  store i32 %oldval, i32* %addr
29  ret void
30}
31
32define i1 @test_cmpxchg_weak_to_bool(i32, i32 *%addr, i32 %desired, i32 %new) {
33; CHECK-LABEL: test_cmpxchg_weak_to_bool:
34; CHECK-NEXT: %bb.0:
35; CHECK-NEXT:     ldrex   [[LOADED:r[0-9]+]], [r1]
36; CHECK-NEXT:     cmp     [[LOADED]], r2
37; CHECK-NEXT:     bne     [[LDFAILBB:LBB[0-9]+_[0-9]+]]
38; CHECK-NEXT: %bb.1:
39; CHECK-NEXT:     dmb ish
40; CHECK-NEXT:     mov     r0, #0
41; CHECK-NEXT:     strex   [[SUCCESS:r[0-9]+]], r3, [r1]
42; CHECK-NEXT:     cmp     [[SUCCESS]], #0
43; CHECK-NEXT:     bxne    lr
44; CHECK-NEXT: LBB1_2:
45; CHECK-NEXT:     mov     r0, #1
46; CHECK-NEXT:     dmb     ish
47; CHECK-NEXT:     bx      lr
48; CHECK-NEXT: [[LDFAILBB]]:
49; CHECK-NEXT:     mov     r0, #0
50; CHECK-NEXT:     clrex
51; CHECK-NEXT:     bx      lr
52;
53  %pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic
54  %success = extractvalue { i32, i1 } %pair, 1
55  ret i1 %success
56}
57