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