1 ; RUN: llc < %s -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s 2 3 define 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 34 define 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
