forked from OSchip/llvm-project
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===- HexagonRemoveExtendArgs.cpp - Remove unnecessary argument sign extends //
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Pass that removes sign extends for function parameters. These parameters
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// are already sign extended by the caller per Hexagon's ABI
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//
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//===----------------------------------------------------------------------===//
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#include "Hexagon.h"
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#include "HexagonTargetMachine.h"
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#include "llvm/CodeGen/MachineFunctionAnalysis.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/Scalar.h"
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using namespace llvm;
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namespace {
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struct HexagonRemoveExtendArgs : public FunctionPass {
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public:
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static char ID;
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HexagonRemoveExtendArgs() : FunctionPass(ID) {}
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virtual bool runOnFunction(Function &F);
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const char *getPassName() const {
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return "Remove sign extends";
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineFunctionAnalysis>();
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AU.addPreserved<MachineFunctionAnalysis>();
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FunctionPass::getAnalysisUsage(AU);
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}
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};
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}
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char HexagonRemoveExtendArgs::ID = 0;
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RegisterPass<HexagonRemoveExtendArgs> X("reargs",
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"Remove Sign and Zero Extends for Args"
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);
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bool HexagonRemoveExtendArgs::runOnFunction(Function &F) {
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unsigned Idx = 1;
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for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end(); AI != AE;
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++AI, ++Idx) {
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if (F.getParamAttributes(Idx).hasAttribute(Attribute::SExt)) {
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Argument* Arg = AI;
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if (!isa<PointerType>(Arg->getType())) {
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for (Instruction::use_iterator UI = Arg->use_begin();
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UI != Arg->use_end();) {
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if (isa<SExtInst>(*UI)) {
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Instruction* Use = cast<Instruction>(*UI);
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SExtInst* SI = new SExtInst(Arg, Use->getType());
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assert (EVT::getEVT(SI->getType()) ==
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(EVT::getEVT(Use->getType())));
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++UI;
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Use->replaceAllUsesWith(SI);
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Instruction* First = F.getEntryBlock().begin();
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SI->insertBefore(First);
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Use->eraseFromParent();
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} else {
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++UI;
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}
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}
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}
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}
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}
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return true;
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}
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FunctionPass *llvm::createHexagonRemoveExtendOps(HexagonTargetMachine &TM) {
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return new HexagonRemoveExtendArgs();
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}
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