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Refactor rewriting for PHI nodes into a separate function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-16 20:25:07 +00:00
parent 0a145f3d90
commit 3a02cbcd03
1 changed files with 70 additions and 49 deletions
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39
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -1188,6 +1188,13 @@ public:
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts,
ScalarEvolution &SE, DominatorTree &DT) const;
void RewriteForPHI(PHINode *PN, const LSRFixup &LF,
const Formula &F,
Loop *L, Instruction *IVIncInsertPos,
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts,
ScalarEvolution &SE, DominatorTree &DT,
Pass *P) const;
void Rewrite(const LSRFixup &LF,
const Formula &F,
Loop *L, Instruction *IVIncInsertPos,
@@ -2921,21 +2928,17 @@ Value *LSRInstance::Expand(const LSRFixup &LF,
return FullV;
}
/// Rewrite - Emit instructions for the leading candidate expression for this
/// LSRUse (this is called "expanding"), and update the UserInst to reference
/// the newly expanded value.
void LSRInstance::Rewrite(const LSRFixup &LF,
/// RewriteForPHI - Helper for Rewrite. PHI nodes are special because the use
/// of their operands effectively happens in their predecessor blocks, so the
/// expression may need to be expanded in multiple places.
void LSRInstance::RewriteForPHI(PHINode *PN,
const LSRFixup &LF,
const Formula &F,
Loop *L, Instruction *IVIncInsertPos,
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts,
ScalarEvolution &SE, DominatorTree &DT,
Pass *P) const {
const Type *OpTy = LF.OperandValToReplace->getType();
// First, find an insertion point that dominates UserInst. For PHI nodes,
// find the nearest block which dominates all the relevant uses.
if (PHINode *PN = dyn_cast<PHINode>(LF.UserInst)) {
DenseMap<BasicBlock *, Value *> Inserted;
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == LF.OperandValToReplace) {
@@ -2972,6 +2975,7 @@ void LSRInstance::Rewrite(const LSRFixup &LF,
Rewriter, DeadInsts, SE, DT);
// If this is reuse-by-noop-cast, insert the noop cast.
const Type *OpTy = LF.OperandValToReplace->getType();
if (FullV->getType() != OpTy)
FullV =
CastInst::Create(CastInst::getCastOpcode(FullV, false,
@@ -2983,11 +2987,28 @@ void LSRInstance::Rewrite(const LSRFixup &LF,
Pair.first->second = FullV;
}
}
}
/// Rewrite - Emit instructions for the leading candidate expression for this
/// LSRUse (this is called "expanding"), and update the UserInst to reference
/// the newly expanded value.
void LSRInstance::Rewrite(const LSRFixup &LF,
const Formula &F,
Loop *L, Instruction *IVIncInsertPos,
SCEVExpander &Rewriter,
SmallVectorImpl<WeakVH> &DeadInsts,
ScalarEvolution &SE, DominatorTree &DT,
Pass *P) const {
// First, find an insertion point that dominates UserInst. For PHI nodes,
// find the nearest block which dominates all the relevant uses.
if (PHINode *PN = dyn_cast<PHINode>(LF.UserInst)) {
RewriteForPHI(PN, LF, F, L, IVIncInsertPos, Rewriter, DeadInsts, SE, DT, P);
} else {
Value *FullV = Expand(LF, F, LF.UserInst, L, IVIncInsertPos,
Rewriter, DeadInsts, SE, DT);
// If this is reuse-by-noop-cast, insert the noop cast.
const Type *OpTy = LF.OperandValToReplace->getType();
if (FullV->getType() != OpTy) {
Instruction *Cast =
CastInst::Create(CastInst::getCastOpcode(FullV, false, OpTy, false),