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PR7959: Handle negative scales in GEPs correctly in BasicAA for non-64-bit

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targets.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2010-09-15 20:08:03 +00:00
parent f1c3eb37ae
commit 39e30124e5
2 changed files with 18 additions and 3 deletions
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6
lib/Analysis/BasicAliasAnalysis.cpp
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@@ -386,8 +386,8 @@ DecomposeGEPExpression(const Value *V, int64_t &BaseOffs,
// The GEP index scale ("Scale") scales C1*V+C2, yielding (C1*V+C2)*Scale.
// This gives us an aggregate computation of (C1*Scale)*V + C2*Scale.
BaseOffs += IndexOffset.getZExtValue()*Scale;
Scale *= IndexScale.getZExtValue();
BaseOffs += IndexOffset.getSExtValue()*Scale;
Scale *= IndexScale.getSExtValue();
// If we already had an occurrance of this index variable, merge this
@@ -407,7 +407,7 @@ DecomposeGEPExpression(const Value *V, int64_t &BaseOffs,
// pointer size.
if (unsigned ShiftBits = 64-TD->getPointerSizeInBits()) {
Scale <<= ShiftBits;
Scale >>= ShiftBits;
Scale = (int64_t)Scale >> ShiftBits;
}
if (Scale) {