| ; Test merging of blocks with phi nodes. | |
| ; | |
| ; RUN: opt < %s -simplifycfg -S | not grep N: | |
| ; | |
| define i32 @test(i1 %a) { | |
| Q: | |
| br i1 %a, label %N, label %M | |
| N: ; preds = %Q | |
| br label %M | |
| M: ; preds = %N, %Q | |
| ; It's ok to merge N and M because the incoming values for W are the | |
| ; same for both cases... | |
| %W = phi i32 [ 2, %N ], [ 2, %Q ] ; <i32> [#uses=1] | |
| %R = add i32 %W, 1 ; <i32> [#uses=1] | |
| ret i32 %R | |
| } | |