| Silviu Baranga | 308a7c7 | 2015-11-03 16:27:04 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -indvars -S | FileCheck %s |
| 2 | |
| 3 | target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| 4 | |
| 5 | ; PR25372 |
| 6 | ; We can compute the expression of %phi0 and that is a SCEV |
| 7 | ; constant. However, instcombine can't deduce this, so we can |
| 8 | ; potentially end up trying to handle a constant when replacing |
| 9 | ; congruent IVs. |
| 10 | |
| 11 | ; CHECK-LABEL: crash |
| 12 | define void @crash() { |
| 13 | entry: |
| 14 | br i1 false, label %not_taken, label %pre |
| 15 | |
| 16 | not_taken: |
| 17 | br label %pre |
| 18 | |
| 19 | pre: |
| 20 | ; %phi0.pre and %phi1.pre are evaluated by SCEV to constant 0. |
| 21 | %phi0.pre = phi i32 [ 0, %entry ], [ 2, %not_taken ] |
| 22 | %phi1.pre = phi i32 [ 0, %entry ], [ 1, %not_taken ] |
| 23 | br label %loop |
| 24 | |
| 25 | loop: |
| 26 | ; %phi0 and %phi1 are evaluated by SCEV to constant 0. |
| 27 | %phi0 = phi i32 [ 0, %loop ], [ %phi0.pre, %pre ] |
| 28 | %phi1 = phi i32 [ 0, %loop ], [ %phi1.pre, %pre ] |
| 29 | br i1 undef, label %exit, label %loop |
| 30 | |
| 31 | exit: |
| 32 | ret void |
| 33 | } |