1 ; RUN: llc -mtriple=x86_64 -o - %s | FileCheck %s 2 3 define i1 @try_cmpxchg(i32* %addr, i32 %desired, i32 %new) { 4 ; CHECK-LABEL: try_cmpxchg: 5 ; CHECK: cmpxchgl 6 ; CHECK-NOT: cmp 7 ; CHECK: sete %al 8 ; CHECK: retq 9 %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst 10 %success = extractvalue { i32, i1 } %pair, 1 11 ret i1 %success 12 } 13 14 define void @cmpxchg_flow(i64* %addr, i64 %desired, i64 %new) { 15 ; CHECK-LABEL: cmpxchg_flow: 16 ; CHECK: cmpxchgq 17 ; CHECK-NOT: cmp 18 ; CHECK-NOT: set 19 ; CHECK: {{jne|jeq}} 20 %pair = cmpxchg i64* %addr, i64 %desired, i64 %new seq_cst seq_cst 21 %success = extractvalue { i64, i1 } %pair, 1 22 br i1 %success, label %true, label %false 23 24 true: 25 call void @foo() 26 ret void 27 28 false: 29 call void @bar() 30 ret void 31 } 32 33 define i64 @cmpxchg_sext(i32* %addr, i32 %desired, i32 %new) { 34 ; CHECK-LABEL: cmpxchg_sext: 35 ; CHECK-DAG: cmpxchgl 36 ; CHECK-NOT: cmpl 37 ; CHECK: sete %al 38 ; CHECK: retq 39 %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst 40 %success = extractvalue { i32, i1 } %pair, 1 41 %mask = sext i1 %success to i64 42 ret i64 %mask 43 } 44 45 define i32 @cmpxchg_zext(i32* %addr, i32 %desired, i32 %new) { 46 ; CHECK-LABEL: cmpxchg_zext: 47 ; CHECK: cmpxchgl 48 ; CHECK-NOT: cmp 49 ; CHECK: sete [[BYTE:%[a-z0-9]+]] 50 ; CHECK: movzbl [[BYTE]], %eax 51 %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst 52 %success = extractvalue { i32, i1 } %pair, 1 53 %mask = zext i1 %success to i32 54 ret i32 %mask 55 } 56 57 58 define i32 @cmpxchg_use_eflags_and_val(i32* %addr, i32 %offset) { 59 ; CHECK-LABEL: cmpxchg_use_eflags_and_val: 60 ; CHECK: movl (%rdi), %e[[OLDVAL:[a-z0-9]+]] 61 62 ; CHECK: [[LOOPBB:.?LBB[0-9]+_[0-9]+]]: 63 ; CHECK: leal (%r[[OLDVAL]],%rsi), [[NEW:%[a-z0-9]+]] 64 ; CHECK: cmpxchgl [[NEW]], (%rdi) 65 ; CHECK-NOT: cmpl 66 ; CHECK: jne [[LOOPBB]] 67 68 ; Result already in %eax 69 ; CHECK: retq 70 entry: 71 %init = load atomic i32* %addr seq_cst, align 4 72 br label %loop 73 74 loop: 75 %old = phi i32 [%init, %entry], [%oldval, %loop] 76 %new = add i32 %old, %offset 77 %pair = cmpxchg i32* %addr, i32 %old, i32 %new seq_cst seq_cst 78 %oldval = extractvalue { i32, i1 } %pair, 0 79 %success = extractvalue { i32, i1 } %pair, 1 80 br i1 %success, label %done, label %loop 81 82 done: 83 ret i32 %oldval 84 } 85 86 declare void @foo() 87 declare void @bar() 88
