| Michael Kuperstein | 2da2bfa | 2017-03-16 21:07:48 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=1 | FileCheck %s |
| 2 | |
| 3 | ; Check we don't peel loops where the latch is not the exiting block. |
| 4 | ; CHECK-LABEL: @invariant_backedge_irreducible |
| 5 | ; CHECK: entry: |
| 6 | ; CHECK: br label %header |
| 7 | ; CHECK-NOT: peel |
| 8 | ; CHECK: header: |
| 9 | ; CHECK: br i1 {{.*}} label %latch, label %exiting |
| 10 | ; CHECK: latch: |
| 11 | ; CHECK: br i1 {{.*}} label %header, label %exiting |
| 12 | ; CHECK: exiting: |
| 13 | ; CHECK: br i1 {{.*}} label %latch, label %exit |
| 14 | |
| 15 | define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) { |
| 16 | entry: |
| 17 | br label %header |
| 18 | |
| 19 | header: |
| 20 | %i = phi i32 [ 0, %entry ], [ %inc, %latch ] |
| 21 | %cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ] |
| 22 | br i1 %cmp.phi, label %latch, label %exiting |
| 23 | |
| 24 | latch: |
| 25 | %inc = add i32 %i, 1 |
| 26 | %cmp = icmp slt i32 %i, 1000 |
| 27 | br i1 %cmp, label %header, label %exiting |
| 28 | |
| 29 | exiting: |
| 30 | %cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ] |
| 31 | br i1 %cmp.exiting, label %latch, label %exit |
| 32 | |
| 33 | exit: |
| 34 | ret i32 0 |
| 35 | } |
| 36 | |