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 6 %pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic 7 %oldval = extractvalue { i32, i1 } %pair, 0 8; CHECK-NEXT: %bb.0: 9; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r0] 10; CHECK-NEXT: cmp [[LOADED]], r1 11; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]] 12; CHECK-NEXT: %bb.1: 13; CHECK-NEXT: dmb ish 14; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r2, [r0] 15; CHECK-NEXT: cmp [[SUCCESS]], #0 16; CHECK-NEXT: beq [[SUCCESSBB:LBB[0-9]+_[0-9]+]] 17; CHECK-NEXT: %bb.2: 18; CHECK-NEXT: str r3, [r0] 19; CHECK-NEXT: bx lr 20; CHECK-NEXT: [[LDFAILBB]]: 21; CHECK-NEXT: clrex 22; CHECK-NEXT: str r3, [r0] 23; CHECK-NEXT: bx lr 24; CHECK-NEXT: [[SUCCESSBB]]: 25; CHECK-NEXT: dmb ish 26; CHECK-NEXT: str r3, [r0] 27; CHECK-NEXT: bx lr 28 29 store i32 %oldval, i32* %addr 30 ret void 31} 32 33 34define i1 @test_cmpxchg_weak_to_bool(i32, i32 *%addr, i32 %desired, i32 %new) { 35; CHECK-LABEL: test_cmpxchg_weak_to_bool: 36 37 %pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic 38 %success = extractvalue { i32, i1 } %pair, 1 39 40; CHECK-NEXT: %bb.0: 41; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r1] 42; CHECK-NEXT: cmp [[LOADED]], r2 43; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]] 44; CHECK-NEXT: %bb.1: 45; CHECK-NEXT: dmb ish 46; CHECK-NEXT: mov r0, #0 47; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r3, [r1] 48; CHECK-NEXT: cmp [[SUCCESS]], #0 49; CHECK-NEXT: bxne lr 50; CHECK-NEXT: mov r0, #1 51; CHECK-NEXT: dmb ish 52; CHECK-NEXT: bx lr 53; CHECK-NEXT: [[LDFAILBB]]: 54; CHECK-NEXT: mov r0, #0 55; CHECK-NEXT: clrex 56; CHECK-NEXT: bx lr 57 58 ret i1 %success 59} 60