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