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Revert r110916. This patch is buggy because the code inside the

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inner loop doesn't update all the variables in the outer loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112665 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-31 22:50:31 +00:00
parent 43a6c5e2fc
commit 90b5f25e8d
1 changed files with 4 additions and 7 deletions
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11
lib/Analysis/ScalarEvolution.cpp
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@@ -1589,7 +1589,6 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
} }
// Check this multiply against other multiplies being added together. // Check this multiply against other multiplies being added together.
bool AnyFold = false;
for (unsigned OtherMulIdx = Idx+1; for (unsigned OtherMulIdx = Idx+1;
OtherMulIdx < Ops.size() && isa<SCEVMulExpr>(Ops[OtherMulIdx]); OtherMulIdx < Ops.size() && isa<SCEVMulExpr>(Ops[OtherMulIdx]);
++OtherMulIdx) { ++OtherMulIdx) {
@@ -1617,14 +1616,12 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
const SCEV *InnerMulSum = getAddExpr(InnerMul1,InnerMul2); const SCEV *InnerMulSum = getAddExpr(InnerMul1,InnerMul2);
const SCEV *OuterMul = getMulExpr(MulOpSCEV, InnerMulSum); const SCEV *OuterMul = getMulExpr(MulOpSCEV, InnerMulSum);
if (Ops.size() == 2) return OuterMul; if (Ops.size() == 2) return OuterMul;
Ops[Idx] = OuterMul; Ops.erase(Ops.begin()+Idx);
Ops.erase(Ops.begin()+OtherMulIdx); Ops.erase(Ops.begin()+OtherMulIdx-1);
OtherMulIdx = Idx; Ops.push_back(OuterMul);
AnyFold = true; return getAddExpr(Ops);
} }
} }
if (AnyFold)
return getAddExpr(Ops);
} }
} }