| Andrew Trick | 4f30524 | 2011-11-17 23:36:35 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -indvars -S | FileCheck %s |
| 2 | ; PR11350: Check that SimplifyIndvar handles a cycle of useless self-phis. |
| 3 | |
| 4 | ; CHECK: @test |
| 5 | ; CHECK-NOT: lcssa = phi |
| 6 | define void @test() nounwind { |
| 7 | entry: |
| 8 | br label %for.cond.preheader |
| 9 | |
| 10 | for.cond.preheader: ; preds = %entry |
| 11 | br label %for.cond.outer |
| 12 | |
| 13 | for.cond.outer: ; preds = %for.cond.preheader, %for.end |
| 14 | %p_41.addr.0.ph = phi i32 [ %p_41.addr.1.lcssa, %for.end ], [ 1, %for.cond.preheader ] |
| 15 | br label %for.cond |
| 16 | |
| 17 | for.cond: |
| 18 | br i1 true, label %for.end, label %for.ph |
| 19 | |
| 20 | for.ph: ; preds = %for.cond4.preheader |
| 21 | br label %for.end |
| 22 | |
| 23 | for.end: |
| 24 | %p_41.addr.1.lcssa = phi i32 [ undef, %for.ph ], [ %p_41.addr.0.ph, %for.cond ] |
| 25 | %p_68.lobit.i = lshr i32 %p_41.addr.1.lcssa, 31 |
| 26 | %cmp7 = icmp eq i32 %p_41.addr.1.lcssa, 0 |
| 27 | %conv8 = zext i1 %cmp7 to i32 |
| 28 | br label %for.cond.outer |
| 29 | } |