| ; RUN: opt < %s -lcssa -licm -S | FileCheck %s |
| ; PR30454 |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| declare i8 @bar() |
| |
| ; Test that we preserve LCSSA form when removing edges from unreachable blocks. |
| ; CHECK-LABEL: @foo |
| define void @foo() { |
| entry: |
| br label %for.cond |
| |
| for.cond: |
| %x = phi i8 [ undef, %entry ], [ %y, %for.latch ] |
| br i1 undef, label %for.latch, label %exit |
| |
| ; CHECK: unreachable.bb: |
| ; CHECK-NEXT: unreachable |
| unreachable.bb: |
| br i1 undef, label %exit, label %for.latch |
| |
| for.latch: |
| %y = call i8 @bar() |
| br label %for.cond |
| |
| ; CHECK: exit: |
| ; CHECK-NEXT: %x.lcssa = phi i8 [ %x, %for.cond ] |
| exit: |
| %z = zext i8 %x to i32 |
| ret void |
| } |