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| author | Chris Lattner <sabre@nondot.org> | 2009-01-19 02:46:28 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-01-19 02:46:28 +0000 |
| commit | c4f85dd708b2b131222f16071e7b8ce9bc8a4fd6 (patch) | |
| tree | 60ff872bbc27b4238c327121e722696fe1734296 /test/Transforms/SimplifyCFG | |
| parent | 9e0dad4f4168d82ae7604caac5c57e79889a57fc (diff) | |
| download | llvm-c4f85dd708b2b131222f16071e7b8ce9bc8a4fd6.tar.gz llvm-c4f85dd708b2b131222f16071e7b8ce9bc8a4fd6.tar.bz2 llvm-c4f85dd708b2b131222f16071e7b8ce9bc8a4fd6.tar.xz | |
Fix PR3016, a bug which can occur do to an invalid assumption:
we assumed a CFG structure that would be valid when all code in
the function is reachable, but not all code is necessarily
reachable. Do a simple, but horrible, CFG walk to check for this
case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62487 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/SimplifyCFG')
| -rw-r--r-- | test/Transforms/SimplifyCFG/2009-01-18-PHIPropCrash.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/2009-01-18-PHIPropCrash.ll b/test/Transforms/SimplifyCFG/2009-01-18-PHIPropCrash.ll new file mode 100644 index 0000000000..692ef74826 --- /dev/null +++ b/test/Transforms/SimplifyCFG/2009-01-18-PHIPropCrash.ll @@ -0,0 +1,30 @@ +; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis +; PR3016 +; Dead use caused invariant violation. + +define i32 @func_105(i1 %tmp5, i1 %tmp7) nounwind { +BB: + br i1 true, label %BB2, label %BB1 + +BB1: ; preds = %BB + br label %BB2 + +BB2: ; preds = %BB1, %BB + %tmp3 = phi i1 [ true, %BB ], [ false, %BB1 ] ; <i1> [#uses=1] + br label %BB9 + +BB9: ; preds = %BB11, %BB2 + %tmp10 = phi i32 [ 0, %BB2 ], [ %tmp12, %BB11 ] ; <i32> [#uses=1] + br i1 %tmp5, label %BB11, label %BB13 + +BB11: ; preds = %BB13, %BB9 + %tmp12 = phi i32 [ 0, %BB13 ], [ %tmp10, %BB9 ] ; <i32> [#uses=2] + br i1 %tmp3, label %BB9, label %BB20 + +BB13: ; preds = %BB13, %BB9 + %tmp14 = phi i32 [ 0, %BB9 ], [ %tmp14, %BB13 ] ; <i32> [#uses=1] + br i1 %tmp7, label %BB13, label %BB11 + +BB20: ; preds = %BB11 + ret i32 %tmp12 +} |