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https://github.com/c64scene-ar/llvm-6502.git
synced 2025-07-25 13:24:46 +00:00
Refactor some methods to look through bitcasts and GEPs on pointers into
a common collection of methods on Value, and share their implementation. We had two variations in two different places already, and I need the third variation for inline cost estimation. Reviewed by Duncan Sands on IRC, but further comments here welcome. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152490 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -317,20 +317,43 @@ void Value::replaceAllUsesWith(Value *New) {
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BB->replaceSuccessorsPhiUsesWith(cast<BasicBlock>(New));
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}
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Value *Value::stripPointerCasts() {
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if (!getType()->isPointerTy())
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return this;
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namespace {
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// Various metrics for how much to strip off of pointers.
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enum PointerStripKind {
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PSK_ZeroIndices,
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PSK_ConstantIndices,
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PSK_InBounds,
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PSK_All
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};
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template <PointerStripKind StripKind>
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static Value *stripPointerCastsAndOffsets(Value *V) {
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if (!V->getType()->isPointerTy())
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return V;
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// Even though we don't look through PHI nodes, we could be called on an
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// instruction in an unreachable block, which may be on a cycle.
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SmallPtrSet<Value *, 4> Visited;
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Value *V = this;
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Visited.insert(V);
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do {
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if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
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if (!GEP->hasAllZeroIndices())
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return V;
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switch (StripKind) {
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case PSK_ZeroIndices:
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if (!GEP->hasAllZeroIndices())
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return V;
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break;
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case PSK_ConstantIndices:
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if (!GEP->hasAllConstantIndices())
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return V;
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break;
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case PSK_InBounds:
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if (!GEP->isInBounds())
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return V;
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break;
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case PSK_All:
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break;
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}
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V = GEP->getPointerOperand();
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} else if (Operator::getOpcode(V) == Instruction::BitCast) {
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V = cast<Operator>(V)->getOperand(0);
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@@ -346,6 +369,19 @@ Value *Value::stripPointerCasts() {
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return V;
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}
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} // namespace
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Value *Value::stripPointerCasts() {
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return stripPointerCastsAndOffsets<PSK_ZeroIndices>(this);
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}
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Value *Value::stripConstantOffsets() {
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return stripPointerCastsAndOffsets<PSK_ConstantIndices>(this);
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}
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Value *Value::stripInBoundsOffsets() {
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return stripPointerCastsAndOffsets<PSK_InBounds>(this);
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}
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/// isDereferenceablePointer - Test if this value is always a pointer to
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/// allocated and suitably aligned memory for a simple load or store.
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