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[CodeGen] Use SmallVector for FixedStackPSVs #91760

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Merged
merged 2 commits into from
May 14, 2024
Merged

[CodeGen] Use SmallVector for FixedStackPSVs #91760

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fb5344c
[CodeGen] Use SmallVector for FixedStackPSVs
aengelke May 10, 2024
d42eab0
[CodeGen] More efficient zig-zag encoding
aengelke May 14, 2024
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4 changes: 2 additions & 2 deletions llvm/include/llvm/CodeGen/PseudoSourceValueManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,10 +13,10 @@
#ifndef LLVM_CODEGEN_PSEUDOSOURCEVALUEMANAGER_H
#define LLVM_CODEGEN_PSEUDOSOURCEVALUEMANAGER_H

#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/IR/ValueMap.h"
#include <map>

namespace llvm {

Expand All @@ -27,7 +27,7 @@ class TargetMachine;
class PseudoSourceValueManager {
const TargetMachine &TM;
const PseudoSourceValue StackPSV, GOTPSV, JumpTablePSV, ConstantPoolPSV;
std::map<int, std::unique_ptr<FixedStackPseudoSourceValue>> FSValues;
SmallVector<std::unique_ptr<FixedStackPseudoSourceValue>> FSValues;
StringMap<std::unique_ptr<const ExternalSymbolPseudoSourceValue>>
ExternalCallEntries;
ValueMap<const GlobalValue *,
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7 changes: 6 additions & 1 deletion llvm/lib/CodeGen/PseudoSourceValue.cpp
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Expand Up @@ -122,7 +122,12 @@ const PseudoSourceValue *PseudoSourceValueManager::getJumpTable() {

const PseudoSourceValue *
PseudoSourceValueManager::getFixedStack(int FI) {
std::unique_ptr<FixedStackPseudoSourceValue> &V = FSValues[FI];
// Frame index is often continuously positive, but can be negative. Use
// zig-zag encoding for dense index into FSValues vector.
unsigned Idx = (2 * unsigned(FI)) ^ (FI >> (sizeof(FI) * 8 - 1));
if (FSValues.size() <= Idx)
FSValues.resize(Idx + 1);
std::unique_ptr<FixedStackPseudoSourceValue> &V = FSValues[Idx];
if (!V)
V = std::make_unique<FixedStackPseudoSourceValue>(FI, TM);
return V.get();
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