| ; RUN: opt -simple-loop-unswitch -loop-deletion -S < %s | FileCheck %s |
| ; RUN: opt -simple-loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -loop-deletion -S < %s | FileCheck %s |
| ; |
| ; Check that when we do unswitching where we re-enqueue the loop to be processed |
| ; again, but manage to delete the loop before ever getting to iterate on it, it |
| ; doesn't crash the legacy pass manager. |
| |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| define void @pr37888() { |
| ; CHECK-LABEL: define void @pr37888() |
| entry: |
| %tobool = icmp ne i16 undef, 0 |
| br label %for.body |
| ; CHECK: %[[TOBOOL:.*]] = icmp ne |
| ; CHECK-NEXT: br i1 %[[TOBOOL]], label %if.then, label %[[ENTRY_SPLIT:.*]] |
| ; |
| ; CHECK: [[ENTRY_SPLIT]]: |
| ; CHECK-NEXT: br label %for.end |
| |
| for.body: |
| br i1 %tobool, label %if.then, label %if.end |
| |
| if.then: |
| unreachable |
| ; CHECK: if.then: |
| ; CHECK-NEXT: unreachable |
| |
| if.end: |
| br label %for.inc |
| |
| for.inc: |
| br i1 undef, label %for.body, label %for.end |
| |
| for.end: |
| ret void |
| ; CHECK: for.end: |
| ; CHECK-NEXT: ret void |
| } |
