| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; RUN: opt -jump-threading -S < %s | FileCheck %s |
| 2 | |
| 3 | declare void @side_effect(i32) |
| 4 | |
| 5 | define void @test0(i32 %i, i32 %len) { |
| 6 | ; CHECK-LABEL: @test0( |
| 7 | entry: |
| 8 | call void @side_effect(i32 0) |
| 9 | %i.inc = add nuw i32 %i, 1 |
| 10 | %c0 = icmp ult i32 %i.inc, %len |
| 11 | br i1 %c0, label %left, label %right |
| 12 | |
| 13 | left: |
| 14 | ; CHECK: entry: |
| 15 | ; CHECK: br i1 %c0, label %left0, label %right |
| 16 | |
| 17 | ; CHECK: left0: |
| 18 | ; CHECK: call void @side_effect |
| 19 | ; CHECK-NOT: br i1 %c1 |
| 20 | ; CHECK: call void @side_effect |
| 21 | call void @side_effect(i32 0) |
| 22 | %c1 = icmp ult i32 %i, %len |
| 23 | br i1 %c1, label %left0, label %right |
| 24 | |
| 25 | left0: |
| 26 | call void @side_effect(i32 0) |
| 27 | ret void |
| 28 | |
| 29 | right: |
| 30 | %t = phi i32 [ 1, %left ], [ 2, %entry ] |
| 31 | call void @side_effect(i32 %t) |
| 32 | ret void |
| 33 | } |
| 34 | |
| 35 | define void @test1(i32 %i, i32 %len) { |
| 36 | ; CHECK-LABEL: @test1( |
| 37 | entry: |
| 38 | call void @side_effect(i32 0) |
| 39 | %i.inc = add nsw i32 %i, 1 |
| 40 | %c0 = icmp slt i32 %i.inc, %len |
| 41 | br i1 %c0, label %left, label %right |
| 42 | |
| 43 | left: |
| 44 | ; CHECK: entry: |
| 45 | ; CHECK: br i1 %c0, label %left0, label %right |
| 46 | |
| 47 | ; CHECK: left0: |
| 48 | ; CHECK: call void @side_effect |
| 49 | ; CHECK-NOT: br i1 %c1 |
| 50 | ; CHECK: call void @side_effect |
| 51 | call void @side_effect(i32 0) |
| 52 | %c1 = icmp slt i32 %i, %len |
| 53 | br i1 %c1, label %left0, label %right |
| 54 | |
| 55 | left0: |
| 56 | call void @side_effect(i32 0) |
| 57 | ret void |
| 58 | |
| 59 | right: |
| 60 | %t = phi i32 [ 1, %left ], [ 2, %entry ] |
| 61 | call void @side_effect(i32 %t) |
| 62 | ret void |
| 63 | } |
| 64 | |
| 65 | define void @test2(i32 %i, i32 %len, i1* %c.ptr) { |
| 66 | ; CHECK-LABEL: @test2( |
| 67 | |
| 68 | ; CHECK: entry: |
| 69 | ; CHECK: br i1 %c0, label %cont, label %right |
| 70 | ; CHECK: cont: |
| 71 | ; CHECK: br i1 %c, label %left0, label %right |
| 72 | ; CHECK: left0: |
| 73 | ; CHECK: call void @side_effect(i32 0) |
| 74 | ; CHECK: call void @side_effect(i32 0) |
| 75 | entry: |
| 76 | call void @side_effect(i32 0) |
| 77 | %i.inc = add nsw i32 %i, 1 |
| 78 | %c0 = icmp slt i32 %i.inc, %len |
| 79 | br i1 %c0, label %cont, label %right |
| 80 | |
| 81 | cont: |
| 82 | %c = load i1, i1* %c.ptr |
| 83 | br i1 %c, label %left, label %right |
| 84 | |
| 85 | left: |
| 86 | call void @side_effect(i32 0) |
| 87 | %c1 = icmp slt i32 %i, %len |
| 88 | br i1 %c1, label %left0, label %right |
| 89 | |
| 90 | left0: |
| 91 | call void @side_effect(i32 0) |
| 92 | ret void |
| 93 | |
| 94 | right: |
| 95 | %t = phi i32 [ 1, %left ], [ 2, %entry ], [ 3, %cont ] |
| 96 | call void @side_effect(i32 %t) |
| 97 | ret void |
| 98 | } |
| 99 | |
| 100 | ; A s<= B implies A s> B is false. |
| 101 | ; CHECK-LABEL: @test3( |
| 102 | ; CHECK: entry: |
| 103 | ; CHECK: br i1 %cmp, label %if.end, label %if.end3 |
| 104 | ; CHECK-NOT: br i1 %cmp1, label %if.then2, label %if.end |
| 105 | ; CHECK-NOT: call void @side_effect(i32 0) |
| 106 | ; CHECK: br label %if.end3 |
| 107 | ; CHECK: ret void |
| 108 | |
| 109 | define void @test3(i32 %a, i32 %b) { |
| 110 | entry: |
| 111 | %cmp = icmp sle i32 %a, %b |
| 112 | br i1 %cmp, label %if.then, label %if.end3 |
| 113 | |
| 114 | if.then: |
| 115 | %cmp1 = icmp sgt i32 %a, %b |
| 116 | br i1 %cmp1, label %if.then2, label %if.end |
| 117 | |
| 118 | if.then2: |
| 119 | call void @side_effect(i32 0) |
| 120 | br label %if.end |
| 121 | |
| 122 | if.end: |
| 123 | br label %if.end3 |
| 124 | |
| 125 | if.end3: |
| 126 | ret void |
| 127 | } |
| 128 | |
| 129 | declare void @is(i1) |
| 130 | |
| 131 | ; If A >=s B is false then A <=s B is implied true. |
| 132 | ; CHECK-LABEL: @test_sge_sle |
| 133 | ; CHECK: call void @is(i1 true) |
| 134 | ; CHECK-NOT: call void @is(i1 false) |
| 135 | define void @test_sge_sle(i32 %a, i32 %b) { |
| 136 | %cmp1 = icmp sge i32 %a, %b |
| 137 | br i1 %cmp1, label %untaken, label %taken |
| 138 | |
| 139 | taken: |
| 140 | %cmp2 = icmp sle i32 %a, %b |
| 141 | br i1 %cmp2, label %istrue, label %isfalse |
| 142 | |
| 143 | istrue: |
| 144 | call void @is(i1 true) |
| 145 | ret void |
| 146 | |
| 147 | isfalse: |
| 148 | call void @is(i1 false) |
| 149 | ret void |
| 150 | |
| 151 | untaken: |
| 152 | ret void |
| 153 | } |
| 154 | |
| 155 | ; If A <=s B is false then A <=s B is implied false. |
| 156 | ; CHECK-LABEL: @test_sle_sle |
| 157 | ; CHECK-NOT: call void @is(i1 true) |
| 158 | ; CHECK: call void @is(i1 false) |
| 159 | define void @test_sle_sle(i32 %a, i32 %b) { |
| 160 | %cmp1 = icmp sle i32 %a, %b |
| 161 | br i1 %cmp1, label %untaken, label %taken |
| 162 | |
| 163 | taken: |
| 164 | %cmp2 = icmp sle i32 %a, %b |
| 165 | br i1 %cmp2, label %istrue, label %isfalse |
| 166 | |
| 167 | istrue: |
| 168 | call void @is(i1 true) |
| 169 | ret void |
| 170 | |
| 171 | isfalse: |
| 172 | call void @is(i1 false) |
| 173 | ret void |
| 174 | |
| 175 | untaken: |
| 176 | ret void |
| 177 | } |