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[Transform]Export LowerSwitch Utility Function #71348

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[Transform]Export LowerSwitch Utility Function #71348

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3 changes: 3 additions & 0 deletions llvm/include/llvm/Transforms/Utils/LowerSwitch.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,15 @@
#ifndef LLVM_TRANSFORMS_UTILS_LOWERSWITCH_H
#define LLVM_TRANSFORMS_UTILS_LOWERSWITCH_H

#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/LazyValueInfo.h"
#include "llvm/IR/PassManager.h"

namespace llvm {
struct LowerSwitchPass : public PassInfoMixin<LowerSwitchPass> {
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
};
bool LowerSwitch(Function &F, LazyValueInfo *LVI, AssumptionCache *AC);
} // namespace llvm

#endif // LLVM_TRANSFORMS_UTILS_LOWERSWITCH_H
42 changes: 20 additions & 22 deletions llvm/lib/Transforms/Utils/LowerSwitch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,6 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/LazyValueInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CFG.h"
Expand Down Expand Up @@ -534,6 +532,25 @@ void ProcessSwitchInst(SwitchInst *SI,
DeleteList.insert(OldDefault);
}

/// Replace all SwitchInst instructions with chained branch instructions.
class LowerSwitchLegacyPass : public FunctionPass {
public:
// Pass identification, replacement for typeid
static char ID;

LowerSwitchLegacyPass() : FunctionPass(ID) {
initializeLowerSwitchLegacyPassPass(*PassRegistry::getPassRegistry());
}

bool runOnFunction(Function &F) override;

void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<LazyValueInfoWrapperPass>();
}
};

} // end anonymous namespace
namespace llvm {
bool LowerSwitch(Function &F, LazyValueInfo *LVI, AssumptionCache *AC) {
bool Changed = false;
SmallPtrSet<BasicBlock *, 8> DeleteList;
Expand All @@ -558,26 +575,7 @@ bool LowerSwitch(Function &F, LazyValueInfo *LVI, AssumptionCache *AC) {

return Changed;
}

/// Replace all SwitchInst instructions with chained branch instructions.
class LowerSwitchLegacyPass : public FunctionPass {
public:
// Pass identification, replacement for typeid
static char ID;

LowerSwitchLegacyPass() : FunctionPass(ID) {
initializeLowerSwitchLegacyPassPass(*PassRegistry::getPassRegistry());
}

bool runOnFunction(Function &F) override;

void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<LazyValueInfoWrapperPass>();
}
};

} // end anonymous namespace

} // namespace llvm
char LowerSwitchLegacyPass::ID = 0;

// Publicly exposed interface to pass...
Expand Down