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author | Chris Lattner <sabre@nondot.org> | 2010-08-18 04:28:19 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2010-08-18 04:28:19 +0000 |
commit | 91b2307a89b836f9452cf867e077ce9762d0845b (patch) | |
tree | 0b7b08dcecc5d39f7f317f28b9b45576d10b1f10 /test/Analysis | |
parent | 903175096e35a9e32dbe2392425f8fa9e33e9787 (diff) | |
download | external_llvm-91b2307a89b836f9452cf867e077ce9762d0845b.zip external_llvm-91b2307a89b836f9452cf867e077ce9762d0845b.tar.gz external_llvm-91b2307a89b836f9452cf867e077ce9762d0845b.tar.bz2 |
fix PR7589: In brief:
gep P, (zext x) != gep P, (sext x)
DecomposeGEPExpression was getting this wrong, confusing
basicaa.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111352 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis')
-rw-r--r-- | test/Analysis/BasicAA/featuretest.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/featuretest.ll b/test/Analysis/BasicAA/featuretest.ll index ce71e9a..47d278f 100644 --- a/test/Analysis/BasicAA/featuretest.ll +++ b/test/Analysis/BasicAA/featuretest.ll @@ -104,3 +104,24 @@ define i32 @constexpr_test() { ; CHECK: @constexpr_test ; CHECK: ret i32 0 } + + + +; PR7589 +; These two index expressions are different, this cannot be CSE'd. +define i16 @zext_sext_confusion(i16* %row2col, i5 %j) nounwind{ +entry: + %sum5.cast = zext i5 %j to i64 ; <i64> [#uses=1] + %P1 = getelementptr i16* %row2col, i64 %sum5.cast + %row2col.load.1.2 = load i16* %P1, align 1 ; <i16> [#uses=1] + + %sum13.cast31 = sext i5 %j to i6 ; <i6> [#uses=1] + %sum13.cast = zext i6 %sum13.cast31 to i64 ; <i64> [#uses=1] + %P2 = getelementptr i16* %row2col, i64 %sum13.cast + %row2col.load.1.6 = load i16* %P2, align 1 ; <i16> [#uses=1] + + %.ret = sub i16 %row2col.load.1.6, %row2col.load.1.2 ; <i16> [#uses=1] + ret i16 %.ret +; CHECK: @zext_sext_confusion +; CHECK: ret i16 %.ret +} |