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| author | Bill Wendling <isanbard@gmail.com> | 2011-03-30 21:37:19 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2011-03-30 21:37:19 +0000 |
| commit | 31d244ead52171632cc4649623b426dbea27040a (patch) | |
| tree | 6c74281dac484b04c931ddd355f895457781c4f9 | |
| parent | 81bd78b89779704aeb762f51c6c19b06d542b6d6 (diff) | |
| download | llvm-31d244ead52171632cc4649623b426dbea27040a.tar.gz llvm-31d244ead52171632cc4649623b426dbea27040a.tar.bz2 llvm-31d244ead52171632cc4649623b426dbea27040a.tar.xz | |
* The DSE code that tested for overlapping needed to take into account the fact
that one of the numbers is signed while the other is unsigned. This could lead
to a wrong result when the signed was promoted to an unsigned int.
* Add the data layout line to the testcase so that it will test the appropriate
thing.
Patch by David Terei!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128577 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Transforms/Scalar/DeadStoreElimination.cpp | 4 | ||||
| -rw-r--r-- | test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll | 1 |
2 files changed, 4 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp index f473cf5ca5..9f36a38691 100644 --- a/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -361,8 +361,10 @@ static bool isCompleteOverwrite(const AliasAnalysis::Location &Later, // // |--earlier--| // |----- later ------| + // + // We have to be careful here as *Off is signed while *.Size is unsigned. if (EarlierOff >= LaterOff && - EarlierOff + Earlier.Size <= LaterOff + Later.Size) + uint64_t(EarlierOff - LaterOff) + Earlier.Size <= Later.Size) return true; // Otherwise, they don't completely overlap. diff --git a/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll b/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll index e268dd5414..079eec43bf 100644 --- a/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll +++ b/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll @@ -1,5 +1,6 @@ ; RUN: opt < %s -basicaa -dse -S | FileCheck %s ; PR9561 +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32" target triple = "i386-apple-darwin9.8" @A = external global [0 x i32] |