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1; RUN: llc < %s -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s2 3define void @test_cmpxchg_weak(ptr %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]], r18; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]]9; CHECK-NEXT: %bb.1:10; CHECK-NEXT: dmb ish11; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r2, [r0]12; CHECK-NEXT: cmp [[SUCCESS]], #013; CHECK-NEXT: bne [[FAILBB:LBB[0-9]+_[0-9]+]]14; CHECK-NEXT: %bb.2:15; CHECK-NEXT: dmb ish16; CHECK-NEXT: str r3, [r0]17; CHECK-NEXT: bx lr18; CHECK-NEXT: [[LDFAILBB]]:19; CHECK-NEXT: clrex20; CHECK-NEXT: [[FAILBB]]:21; CHECK-NEXT: str r3, [r0]22; CHECK-NEXT: bx lr23;24 %pair = cmpxchg weak ptr %addr, i32 %desired, i32 %new seq_cst monotonic25 %oldval = extractvalue { i32, i1 } %pair, 026 store i32 %oldval, ptr %addr27 ret void28}29 30define i1 @test_cmpxchg_weak_to_bool(i32, ptr %addr, i32 %desired, i32 %new) {31; CHECK-LABEL: test_cmpxchg_weak_to_bool:32; CHECK-NEXT: %bb.0:33; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r1]34; CHECK-NEXT: cmp [[LOADED]], r235; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]]36; CHECK-NEXT: %bb.1:37; CHECK-NEXT: dmb ish38; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r3, [r1]39; CHECK-NEXT: cmp [[SUCCESS]], #040; CHECK-NEXT: bne [[FAILBB:LBB[0-9]+_[0-9]+]] 41; CHECK-NEXT: %bb.2:42; CHECK-NEXT: mov r0, #143; CHECK-NEXT: dmb ish44; CHECK-NEXT: bx lr45; CHECK-NEXT: [[LDFAILBB]]:46; CHECK-NEXT: clrex47; CHECK-NEXT: [[FAILBB]]:48; CHECK-NEXT: mov r0, #049; CHECK-NEXT: bx lr50;51 52 %pair = cmpxchg weak ptr %addr, i32 %desired, i32 %new seq_cst monotonic53 %success = extractvalue { i32, i1 } %pair, 154 ret i1 %success55}56