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Diffstat (limited to 'test/Transforms/InstCombine/2004-01-13-InstCombineInvokePHI.ll')
| -rw-r--r-- | test/Transforms/InstCombine/2004-01-13-InstCombineInvokePHI.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2004-01-13-InstCombineInvokePHI.ll b/test/Transforms/InstCombine/2004-01-13-InstCombineInvokePHI.ll new file mode 100644 index 0000000..bec0b9e --- /dev/null +++ b/test/Transforms/InstCombine/2004-01-13-InstCombineInvokePHI.ll @@ -0,0 +1,28 @@ +; Test for a problem afflicting several C++ programs in the testsuite. The +; instcombine pass is trying to get rid of the cast in the invoke instruction, +; inserting a cast of the return value after the PHI instruction, but which is +; used by the PHI instruction. This is bad: because of the semantics of the +; invoke instruction, we really cannot perform this transformation at all at +; least without splitting the critical edge. +; +; RUN: opt < %s -instcombine -disable-output + +declare i8* @test() + +define i32 @foo() { +entry: + br i1 true, label %cont, label %call + +call: ; preds = %entry + %P = invoke i32* bitcast (i8* ()* @test to i32* ()*)( ) + to label %cont unwind label %N ; <i32*> [#uses=1] + +cont: ; preds = %call, %entry + %P2 = phi i32* [ %P, %call ], [ null, %entry ] ; <i32*> [#uses=1] + %V = load i32* %P2 ; <i32> [#uses=1] + ret i32 %V + +N: ; preds = %call + ret i32 0 +} + |