| Frits van Bommel | 26e097c | 2010-12-15 09:51:20 +0000 | [diff] [blame^] | 1 | ; RUN: opt -S -jump-threading < %s | FileCheck %s |
| 2 | |
| 3 | declare void @foo() |
| 4 | declare void @bar() |
| 5 | declare void @baz() |
| 6 | declare void @quux() |
| 7 | |
| 8 | |
| 9 | ; Jump threading of branch with select as condition. |
| 10 | ; Mostly theoretical since instruction combining simplifies all selects of |
| 11 | ; booleans where at least one operand is true/false/undef. |
| 12 | |
| 13 | ; CHECK: @test_br |
| 14 | ; CHECK-NEXT: entry: |
| 15 | ; CHECK-NEXT: br i1 %cond, label %L1, |
| 16 | define void @test_br(i1 %cond, i1 %value) nounwind { |
| 17 | entry: |
| 18 | br i1 %cond, label %L0, label %L3 |
| 19 | L0: |
| 20 | %expr = select i1 %cond, i1 true, i1 %value |
| 21 | br i1 %expr, label %L1, label %L2 |
| 22 | |
| 23 | L1: |
| 24 | call void @foo() |
| 25 | ret void |
| 26 | L2: |
| 27 | call void @bar() |
| 28 | ret void |
| 29 | L3: |
| 30 | call void @baz() |
| 31 | br label %L0 |
| 32 | } |
| 33 | |
| 34 | |
| 35 | ; Jump threading of switch with select as condition. |
| 36 | |
| 37 | ; CHECK: @test_switch |
| 38 | ; CHECK-NEXT: entry: |
| 39 | ; CHECK-NEXT: br i1 %cond, label %L1, |
| 40 | define void @test_switch(i1 %cond, i8 %value) nounwind { |
| 41 | entry: |
| 42 | br i1 %cond, label %L0, label %L4 |
| 43 | L0: |
| 44 | %expr = select i1 %cond, i8 1, i8 %value |
| 45 | switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2] |
| 46 | |
| 47 | L1: |
| 48 | call void @foo() |
| 49 | ret void |
| 50 | L2: |
| 51 | call void @bar() |
| 52 | ret void |
| 53 | L3: |
| 54 | call void @baz() |
| 55 | ret void |
| 56 | L4: |
| 57 | call void @quux() |
| 58 | br label %L0 |
| 59 | } |
| 60 | |
| 61 | ; Make sure the blocks in the indirectbr test aren't trivially removable as |
| 62 | ; successors by taking their addresses. |
| 63 | @anchor = constant [3 x i8*] [ |
| 64 | i8* blockaddress(@test_indirectbr, %L1), |
| 65 | i8* blockaddress(@test_indirectbr, %L2), |
| 66 | i8* blockaddress(@test_indirectbr, %L3) |
| 67 | ] |
| 68 | |
| 69 | |
| 70 | ; Jump threading of indirectbr with select as address. |
| 71 | |
| 72 | ; CHECK: @test_indirectbr |
| 73 | ; CHECK-NEXT: entry: |
| 74 | ; CHECK-NEXT: br i1 %cond, label %L1, label %L3 |
| 75 | define void @test_indirectbr(i1 %cond, i8* %address) nounwind { |
| 76 | entry: |
| 77 | br i1 %cond, label %L0, label %L3 |
| 78 | L0: |
| 79 | %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address |
| 80 | indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3] |
| 81 | |
| 82 | L1: |
| 83 | call void @foo() |
| 84 | ret void |
| 85 | L2: |
| 86 | call void @bar() |
| 87 | ret void |
| 88 | L3: |
| 89 | call void @baz() |
| 90 | ret void |
| 91 | } |
| 92 | |
| 93 | |
| 94 | ; A more complicated case: the condition is a select based on a comparison. |
| 95 | |
| 96 | ; CHECK: @test_switch_cmp |
| 97 | ; CHECK-NEXT: entry: |
| 98 | ; CHECK-NEXT: br i1 %cond, label %L0, label %[[THREADED:[A-Za-z.0-9]+]] |
| 99 | ; CHECK: [[THREADED]]: |
| 100 | ; CHECK-NEXT: call void @quux |
| 101 | ; CHECK-NEXT: br label %L1 |
| 102 | define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind { |
| 103 | entry: |
| 104 | br i1 %cond, label %L0, label %L4 |
| 105 | L0: |
| 106 | %val.phi = phi i32 [%val, %entry], [-1, %L4] |
| 107 | %cmp = icmp slt i32 %val.phi, 0 |
| 108 | %expr = select i1 %cmp, i8 1, i8 %value |
| 109 | switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2] |
| 110 | |
| 111 | L1: |
| 112 | call void @foo() |
| 113 | ret void |
| 114 | L2: |
| 115 | call void @bar() |
| 116 | ret void |
| 117 | L3: |
| 118 | call void @baz() |
| 119 | ret void |
| 120 | L4: |
| 121 | call void @quux() |
| 122 | br label %L0 |
| 123 | } |