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: dmb ish 9 ; CHECK: ldrex [[LOADED:r[0-9]+]], [r0] 10 ; CHECK: cmp [[LOADED]], r1 11 ; CHECK: strexeq [[SUCCESS:r[0-9]+]], r2, [r0] 12 ; CHECK: cmpeq [[SUCCESS]], #0 13 ; CHECK: bne [[DONE:LBB[0-9]+_[0-9]+]] 14 ; CHECK: dmb ish 15 ; CHECK: [[DONE]]: 16 ; CHECK: str r3, [r0] 17 ; CHECK: bx lr 18 19 store i32 %oldval, i32* %addr 20 ret void 21 } 22 23 24 define i1 @test_cmpxchg_weak_to_bool(i32, i32 *%addr, i32 %desired, i32 %new) { 25 ; CHECK-LABEL: test_cmpxchg_weak_to_bool: 26 27 %pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic 28 %success = extractvalue { i32, i1 } %pair, 1 29 30 ; CHECK: dmb ish 31 ; CHECK: mov r0, #0 32 ; CHECK: ldrex [[LOADED:r[0-9]+]], [r1] 33 ; CHECK: cmp [[LOADED]], r2 34 ; CHECK: strexeq [[STATUS:r[0-9]+]], r3, [r1] 35 ; CHECK: cmpeq [[STATUS]], #0 36 ; CHECK: bne [[DONE:LBB[0-9]+_[0-9]+]] 37 ; CHECK: dmb ish 38 ; CHECK: mov r0, #1 39 ; CHECK: [[DONE]]: 40 ; CHECK: bx lr 41 42 ret i1 %success 43 } 44
