| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| 2 | ; RUN: opt < %s -S -jump-threading | FileCheck %s |
| 3 | |
| 4 | ; This test used to cause jump threading to try to split an edge of a callbr. |
| 5 | |
| 6 | @a = global i32 0 |
| 7 | |
| 8 | define i32 @c() { |
| 9 | ; CHECK-LABEL: @c( |
| 10 | ; CHECK-NEXT: entry: |
| 11 | ; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a |
| 12 | ; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0 |
| 13 | ; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]] |
| 14 | ; CHECK: if.then: |
| 15 | ; CHECK-NEXT: [[CALL:%.*]] = call i32 @b() |
| 16 | ; CHECK-NEXT: [[PHITMP:%.*]] = icmp ne i32 [[CALL]], 0 |
| 17 | ; CHECK-NEXT: br i1 [[PHITMP]], label [[IF_THEN2:%.*]], label [[IF_END4:%.*]] |
| 18 | ; CHECK: if.else: |
| 19 | ; CHECK-NEXT: callbr void asm sideeffect "", "X"(i8* blockaddress(@c, [[IF_THEN2]])) |
| 20 | ; CHECK-NEXT: to label [[IF_END_THREAD:%.*]] [label %if.then2] |
| 21 | ; CHECK: if.end.thread: |
| 22 | ; CHECK-NEXT: br label [[IF_THEN2]] |
| 23 | ; CHECK: if.then2: |
| 24 | ; CHECK-NEXT: [[CALL3:%.*]] = call i32 @b() |
| 25 | ; CHECK-NEXT: br label [[IF_END4]] |
| 26 | ; CHECK: if.end4: |
| 27 | ; CHECK-NEXT: ret i32 undef |
| 28 | ; |
| 29 | entry: |
| 30 | %0 = load i32, i32* @a |
| 31 | %tobool = icmp eq i32 %0, 0 |
| 32 | br i1 %tobool, label %if.else, label %if.then |
| 33 | |
| 34 | if.then: ; preds = %entry |
| 35 | %call = call i32 @b() #2 |
| 36 | %phitmp = icmp ne i32 %call, 0 |
| 37 | br label %if.end |
| 38 | |
| 39 | if.else: ; preds = %entry |
| 40 | callbr void asm sideeffect "", "X"(i8* blockaddress(@c, %if.end)) #2 |
| 41 | to label %normal [label %if.end] |
| 42 | |
| 43 | normal: ; preds = %if.else |
| 44 | br label %if.end |
| 45 | |
| 46 | if.end: ; preds = %if.else, %normal, %if.then |
| 47 | %d.0 = phi i1 [ %phitmp, %if.then ], [ undef, %normal ], [ undef, %if.else ] |
| 48 | br i1 %d.0, label %if.then2, label %if.end4 |
| 49 | |
| 50 | if.then2: ; preds = %if.end |
| 51 | %call3 = call i32 @b() |
| 52 | br label %if.end4 |
| 53 | |
| 54 | if.end4: ; preds = %if.then2, %if.end |
| 55 | ret i32 undef |
| 56 | } |
| 57 | |
| 58 | declare i32 @b() |