| ; RUN: llc < %s -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s |
| |
| define void @test_cmpxchg_weak(ptr %addr, i32 %desired, i32 %new) { |
| ; CHECK-LABEL: test_cmpxchg_weak: |
| ; CHECK-NEXT: %bb.0: |
| ; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r0] |
| ; CHECK-NEXT: cmp [[LOADED]], r1 |
| ; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]] |
| ; CHECK-NEXT: %bb.1: |
| ; CHECK-NEXT: dmb ish |
| ; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r2, [r0] |
| ; CHECK-NEXT: cmp [[SUCCESS]], #0 |
| ; CHECK-NEXT: beq [[SUCCESSBB:LBB[0-9]+_[0-9]+]] |
| ; CHECK-NEXT: %bb.2: |
| ; CHECK-NEXT: str r3, [r0] |
| ; CHECK-NEXT: bx lr |
| ; CHECK-NEXT: [[LDFAILBB]]: |
| ; CHECK-NEXT: clrex |
| ; CHECK-NEXT: str r3, [r0] |
| ; CHECK-NEXT: bx lr |
| ; CHECK-NEXT: [[SUCCESSBB]]: |
| ; CHECK-NEXT: dmb ish |
| ; CHECK-NEXT: str r3, [r0] |
| ; CHECK-NEXT: bx lr |
| ; |
| %pair = cmpxchg weak ptr %addr, i32 %desired, i32 %new seq_cst monotonic |
| %oldval = extractvalue { i32, i1 } %pair, 0 |
| store i32 %oldval, ptr %addr |
| ret void |
| } |
| |
| define i1 @test_cmpxchg_weak_to_bool(i32, ptr %addr, i32 %desired, i32 %new) { |
| ; CHECK-LABEL: test_cmpxchg_weak_to_bool: |
| ; CHECK-NEXT: %bb.0: |
| ; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r1] |
| ; CHECK-NEXT: cmp [[LOADED]], r2 |
| ; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]] |
| ; CHECK-NEXT: %bb.1: |
| ; CHECK-NEXT: dmb ish |
| ; CHECK-NEXT: mov r0, #0 |
| ; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r3, [r1] |
| ; CHECK-NEXT: cmp [[SUCCESS]], #0 |
| ; CHECK-NEXT: bxne lr |
| ; CHECK-NEXT: LBB1_2: |
| ; CHECK-NEXT: mov r0, #1 |
| ; CHECK-NEXT: dmb ish |
| ; CHECK-NEXT: bx lr |
| ; CHECK-NEXT: [[LDFAILBB]]: |
| ; CHECK-NEXT: mov r0, #0 |
| ; CHECK-NEXT: clrex |
| ; CHECK-NEXT: bx lr |
| ; |
| %pair = cmpxchg weak ptr %addr, i32 %desired, i32 %new seq_cst monotonic |
| %success = extractvalue { i32, i1 } %pair, 1 |
| ret i1 %success |
| } |