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Optimize ScalarEvolution::getAddExpr's operand factoring code by

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having it finish processing all of the muliply operands before
starting the whole getAddExpr process over again, instead of
immediately after the first simplification.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110916 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-08-12 15:00:23 +00:00
parent 918e76b8b5
commit 727356fc7d
1 changed files with 7 additions and 4 deletions
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11
lib/Analysis/ScalarEvolution.cpp
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@ -1541,6 +1541,7 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
}
// Check this multiply against other multiplies being added together.
bool AnyFold = false;
for (unsigned OtherMulIdx = Idx+1;
OtherMulIdx < Ops.size() && isa<SCEVMulExpr>(Ops[OtherMulIdx]);
++OtherMulIdx) {
@ -1568,12 +1569,14 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
const SCEV *InnerMulSum = getAddExpr(InnerMul1,InnerMul2);
const SCEV *OuterMul = getMulExpr(MulOpSCEV, InnerMulSum);
if (Ops.size() == 2) return OuterMul;
Ops.erase(Ops.begin()+Idx);
Ops.erase(Ops.begin()+OtherMulIdx-1);
Ops.push_back(OuterMul);
return getAddExpr(Ops);
Ops[Idx] = OuterMul;
Ops.erase(Ops.begin()+OtherMulIdx);
OtherMulIdx = Idx;
AnyFold = true;
}
}
if (AnyFold)
return getAddExpr(Ops);
}
}