| ; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=1 | FileCheck %s |
| |
| ; Check we don't peel loops where the latch is not the exiting block. |
| ; CHECK-LABEL: @invariant_backedge_irreducible |
| ; CHECK: entry: |
| ; CHECK: br label %header |
| ; CHECK-NOT: peel |
| ; CHECK: header: |
| ; CHECK: br i1 {{.*}} label %latch, label %exiting |
| ; CHECK: latch: |
| ; CHECK: br i1 {{.*}} label %header, label %exiting |
| ; CHECK: exiting: |
| ; CHECK: br i1 {{.*}} label %latch, label %exit |
| |
| define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) { |
| entry: |
| br label %header |
| |
| header: |
| %i = phi i32 [ 0, %entry ], [ %inc, %latch ] |
| %cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ] |
| br i1 %cmp.phi, label %latch, label %exiting |
| |
| latch: |
| %inc = add i32 %i, 1 |
| %cmp = icmp slt i32 %i, 1000 |
| br i1 %cmp, label %header, label %exiting |
| |
| exiting: |
| %cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ] |
| br i1 %cmp.exiting, label %latch, label %exit |
| |
| exit: |
| ret i32 0 |
| } |
| |
