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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-02-10 23:54:10 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-02-10 23:54:10 +0000 |
| commit | 3b739d278c87f8ac22b5dc368b319fa278347b2f (patch) | |
| tree | 38d264e0e347f1b60ba4ab886858726ece2b6cd0 /test/Transforms/JumpThreading | |
| parent | 2c2b933037ecd5a0ebcfa3077606892802c04a29 (diff) | |
| download | llvm-3b739d278c87f8ac22b5dc368b319fa278347b2f.tar.gz llvm-3b739d278c87f8ac22b5dc368b319fa278347b2f.tar.bz2 llvm-3b739d278c87f8ac22b5dc368b319fa278347b2f.tar.xz | |
Tolerate degenerate phi nodes that can occur in the middle of optimization
passes. Fixes PR9112. Patch by Jakub Staszak!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125319 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/JumpThreading')
| -rw-r--r-- | test/Transforms/JumpThreading/degenerate-phi.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Transforms/JumpThreading/degenerate-phi.ll b/test/Transforms/JumpThreading/degenerate-phi.ll new file mode 100644 index 0000000000..35d9fdec42 --- /dev/null +++ b/test/Transforms/JumpThreading/degenerate-phi.ll @@ -0,0 +1,24 @@ +; RUN: opt -jump-threading -disable-output %s +; PR9112 + +; This is actually a test for value tracking. Jump threading produces +; "%phi = phi i16" when it removes all edges leading to %unreachable. +; The .ll parser won't let us write that directly since it's invalid code. + +define void @func() nounwind { +entry: + br label %bb + +bb: + br label %bb + +unreachable: + %phi = phi i16 [ %add, %unreachable ], [ 0, %next ] + %add = add i16 0, %phi + %cmp = icmp slt i16 %phi, 0 + br i1 %cmp, label %unreachable, label %next + +next: + br label %unreachable +} + |