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Generalize SCEVExpander::visitAddRecExpr's GEP persuit, and avoid

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sending SCEVUnknowns to expandAddToGEP. This avoids the need for
expandAddToGEP to bend the rules and peek into SCEVUnknown
expressions.

Factor out the code for testing whether a SCEV can be factored by
a constant for use in a GEP index. This allows it to handle
SCEVAddRecExprs, by recursing.

As a result, SCEVExpander can now put more things in GEP indices,
so it emits fewer explicit mul instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72366 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-05-24 18:06:31 +00:00
parent 3925043af0
commit 453aa4fbf1
4 changed files with 221 additions and 54 deletions
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4
include/llvm/Analysis/ScalarEvolutionExpander.h
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@ -110,8 +110,8 @@ namespace llvm {
private:
/// expandAddToGEP - Expand a SCEVAddExpr with a pointer type into a GEP
/// instead of using ptrtoint+arithmetic+inttoptr.
Value *expandAddToGEP(const SCEVAddExpr *S, const PointerType *PTy,
const Type *Ty, Value *V);
Value *expandAddToGEP(const SCEVHandle *op_begin, const SCEVHandle *op_end,
const PointerType *PTy, const Type *Ty, Value *V);
Value *expand(const SCEV *S);