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Refactor the code for computing the insertion point for an expression into

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a separate function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-04-09 02:00:38 +00:00
parent 8c0a1608d5
commit d96eae8010
1 changed files with 29 additions and 8 deletions
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37
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1236,6 +1236,10 @@ public:
DenseSet<const SCEV *> &VisitedRegs) const;
void Solve(SmallVectorImpl<const Formula *> &Solution) const;
BasicBlock::iterator AdjustInputPositionForExpand(BasicBlock::iterator IP,
const LSRFixup &LF,
const LSRUse &LU) const;
Value *Expand(const LSRFixup &LF,
const Formula &F,
BasicBlock::iterator IP,
@ -2801,14 +2805,13 @@ static BasicBlock *getImmediateDominator(BasicBlock *BB, DominatorTree &DT) {
return Node->getBlock();
}
Value *LSRInstance::Expand(const LSRFixup &LF,
const Formula &F,
BasicBlock::iterator IP,
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts) const {
const LSRUse &LU = Uses[LF.LUIdx];
// Then, collect some instructions which must be dominated by the
/// AdjustInputPositionForExpand - Determine an input position which will be
/// dominated by the operands and which will dominate the result.
BasicBlock::iterator
LSRInstance::AdjustInputPositionForExpand(BasicBlock::iterator IP,
const LSRFixup &LF,
const LSRUse &LU) const {
// Collect some instructions which must be dominated by the
// expanding replacement. These must be dominated by any operands that
// will be required in the expansion.
SmallVector<Instruction *, 4> Inputs;
@ -2867,9 +2870,27 @@ Value *LSRInstance::Expand(const LSRFixup &LF,
else
IP = Tentative;
}
// Don't insert instructions before PHI nodes.
while (isa<PHINode>(IP)) ++IP;
// Ignore debug intrinsics.
while (isa<DbgInfoIntrinsic>(IP)) ++IP;
return IP;
}
Value *LSRInstance::Expand(const LSRFixup &LF,
const Formula &F,
BasicBlock::iterator IP,
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts) const {
const LSRUse &LU = Uses[LF.LUIdx];
// Determine an input position which will be dominated by the operands and
// which will dominate the result.
IP = AdjustInputPositionForExpand(IP, LF, LU);
// Inform the Rewriter if we have a post-increment use, so that it can
// perform an advantageous expansion.
Rewriter.setPostInc(LF.PostIncLoops);