| Tim Northover | 51472bc | 2014-06-13 17:29:39 +0000 | [diff] [blame] | 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() |