| Sanjoy Das | 54a3a00 | 2016-04-21 05:09:12 +0000 | [diff] [blame^] | 1 | ; RUN: opt -S -simplifycfg < %s | FileCheck %s |
| 2 | |
| 3 | declare void @llvm.experimental.guard(i1, ...) |
| 4 | |
| 5 | define i32 @f_0(i1 %c) { |
| 6 | ; CHECK-LABEL: @f_0( |
| 7 | ; CHECK-NEXT: entry: |
| 8 | ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 9 | ; CHECK-NEXT: unreachable |
| 10 | entry: |
| 11 | call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 12 | ret i32 10 |
| 13 | } |
| 14 | |
| 15 | define i32 @f_1(i1 %c) { |
| 16 | ; Demonstrate that we (intentionally) do not simplify a guard on undef |
| 17 | |
| 18 | ; CHECK-LABEL: @f_1( |
| 19 | ; CHECK: ret i32 10 |
| 20 | ; CHECK: ret i32 20 |
| 21 | |
| 22 | entry: |
| 23 | br i1 %c, label %true, label %false |
| 24 | |
| 25 | true: |
| 26 | call void(i1, ...) @llvm.experimental.guard(i1 undef) [ "deopt"() ] |
| 27 | ret i32 10 |
| 28 | |
| 29 | false: |
| 30 | ret i32 20 |
| 31 | } |
| 32 | |
| 33 | define i32 @f_2(i1 %c, i32* %buf) { |
| 34 | ; CHECK-LABEL: @f_2( |
| 35 | entry: |
| 36 | br i1 %c, label %guard_block, label %merge_block |
| 37 | |
| 38 | guard_block: |
| 39 | call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 40 | %val = load i32, i32* %buf |
| 41 | br label %merge_block |
| 42 | |
| 43 | merge_block: |
| 44 | %to.return = phi i32 [ %val, %guard_block ], [ 50, %entry ] |
| 45 | ret i32 %to.return |
| 46 | ; CHECK: guard_block: |
| 47 | ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 48 | ; CHECK-NEXT: unreachable |
| 49 | |
| 50 | ; CHECK: merge_block: |
| 51 | ; CHECK-NEXT: ret i32 50 |
| 52 | } |
| 53 | |
| 54 | define i32 @f_3(i1* %c, i32* %buf) { |
| 55 | ; CHECK-LABEL: @f_3( |
| 56 | entry: |
| 57 | %c0 = load volatile i1, i1* %c |
| 58 | br i1 %c0, label %guard_block, label %merge_block |
| 59 | |
| 60 | guard_block: |
| 61 | call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 62 | %val = load i32, i32* %buf |
| 63 | %c2 = load volatile i1, i1* %c |
| 64 | br i1 %c2, label %left, label %right |
| 65 | |
| 66 | merge_block: |
| 67 | %c1 = load volatile i1, i1* %c |
| 68 | br i1 %c1, label %left, label %right |
| 69 | |
| 70 | left: |
| 71 | %val.left = phi i32 [ %val, %guard_block ], [ 50, %merge_block ] |
| 72 | ret i32 %val.left |
| 73 | |
| 74 | right: |
| 75 | %val.right = phi i32 [ %val, %guard_block ], [ 100, %merge_block ] |
| 76 | ret i32 %val.right |
| 77 | |
| 78 | ; CHECK: guard_block: |
| 79 | ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 80 | ; CHECK-NEXT: unreachable |
| 81 | |
| 82 | ; CHECK: merge_block: |
| 83 | ; CHECK-NEXT: %c1 = load volatile i1, i1* %c |
| 84 | ; CHECK-NEXT: [[VAL:%[^ ]]] = select i1 %c1, i32 50, i32 100 |
| 85 | ; CHECK-NEXT: ret i32 [[VAL]] |
| 86 | } |