//===- LevelRaise.cpp - Code to change LLVM to higher level ---------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This file implements the 'raising' part of the LevelChange API. This is
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Local.h"
#include "TransformInternals.h"
-#include "llvm/iOther.h"
-#include "llvm/iMemory.h"
+#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "Support/CommandLine.h"
-#include "Support/Debug.h"
-#include "Support/Statistic.h"
-#include "Support/STLExtras.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/STLExtras.h"
#include <algorithm>
+#include <iostream>
using namespace llvm;
// StartInst - This enables the -raise-start-inst=foo option to cause the level
static Statistic<>
NumLoadStorePeepholes("raise", "Number of load/store peepholes");
-static Statistic<>
+static Statistic<>
NumGEPInstFormed("raise", "Number of other getelementptr's formed");
static Statistic<>
}
-Pass *llvm::createRaisePointerReferencesPass() {
+FunctionPass *llvm::createRaisePointerReferencesPass() {
return new RPR();
}
return!CI->getOperand(0)->getType()->isLosslesslyConvertibleTo(CI->getType());
}
-
-// Peephole optimize the following instructions:
-// %t1 = cast ? to x *
-// %t2 = add x * %SP, %t1 ;; Constant must be 2nd operand
-//
-// Into: %t3 = getelementptr {<...>} * %SP, <element indices>
-// %t2 = cast <eltype> * %t3 to {<...>}*
-//
-static bool HandleCastToPointer(BasicBlock::iterator BI,
- const PointerType *DestPTy,
- const TargetData &TD) {
- CastInst &CI = cast<CastInst>(*BI);
- if (CI.use_empty()) return false;
-
- // Scan all of the uses, looking for any uses that are not add or sub
- // instructions. If we have non-adds, do not make this transformation.
- //
- bool HasSubUse = false; // Keep track of any subtracts...
- for (Value::use_iterator I = CI.use_begin(), E = CI.use_end();
- I != E; ++I)
- if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*I)) {
- if ((BO->getOpcode() != Instruction::Add &&
- BO->getOpcode() != Instruction::Sub) ||
- // Avoid add sbyte* %X, %X cases...
- BO->getOperand(0) == BO->getOperand(1))
- return false;
- else
- HasSubUse |= BO->getOpcode() == Instruction::Sub;
- } else {
- return false;
- }
-
- std::vector<Value*> Indices;
- Value *Src = CI.getOperand(0);
- const Type *Result = ConvertibleToGEP(DestPTy, Src, Indices, TD, &BI);
- if (Result == 0) return false; // Not convertible...
-
- // Cannot handle subtracts if there is more than one index required...
- if (HasSubUse && Indices.size() != 1) return false;
-
- PRINT_PEEPHOLE2("cast-add-to-gep:in", *Src, CI);
-
- // If we have a getelementptr capability... transform all of the
- // add instruction uses into getelementptr's.
- while (!CI.use_empty()) {
- BinaryOperator *I = cast<BinaryOperator>(*CI.use_begin());
- assert((I->getOpcode() == Instruction::Add ||
- I->getOpcode() == Instruction::Sub) &&
- "Use is not a valid add instruction!");
-
- // Get the value added to the cast result pointer...
- Value *OtherPtr = I->getOperand((I->getOperand(0) == &CI) ? 1 : 0);
-
- Instruction *GEP = new GetElementPtrInst(OtherPtr, Indices, I->getName());
- PRINT_PEEPHOLE1("cast-add-to-gep:i", *I);
-
- // If the instruction is actually a subtract, we are guaranteed to only have
- // one index (from code above), so we just need to negate the pointer index
- // long value.
- if (I->getOpcode() == Instruction::Sub) {
- Instruction *Neg = BinaryOperator::createNeg(GEP->getOperand(1),
- GEP->getOperand(1)->getName()+".neg", I);
- GEP->setOperand(1, Neg);
- }
-
- if (GEP->getType() == I->getType()) {
- // Replace the old add instruction with the shiny new GEP inst
- ReplaceInstWithInst(I, GEP);
- } else {
- // If the type produced by the gep instruction differs from the original
- // add instruction type, insert a cast now.
- //
-
- // Insert the GEP instruction before the old add instruction...
- I->getParent()->getInstList().insert(I, GEP);
-
- PRINT_PEEPHOLE1("cast-add-to-gep:o", *GEP);
- GEP = new CastInst(GEP, I->getType());
-
- // Replace the old add instruction with the shiny new GEP inst
- ReplaceInstWithInst(I, GEP);
- }
-
- PRINT_PEEPHOLE1("cast-add-to-gep:o", *GEP);
- }
- return true;
-}
-
-// Peephole optimize the following instructions:
-// %t1 = cast ulong <const int> to {<...>} *
-// %t2 = add {<...>} * %SP, %t1 ;; Constant must be 2nd operand
-//
-// or
-// %t1 = cast {<...>}* %SP to int*
-// %t5 = cast ulong <const int> to int*
-// %t2 = add int* %t1, %t5 ;; int is same size as field
-//
-// Into: %t3 = getelementptr {<...>} * %SP, <element indices>
-// %t2 = cast <eltype> * %t3 to {<...>}*
-//
-static bool PeepholeOptimizeAddCast(BasicBlock *BB, BasicBlock::iterator &BI,
- Value *AddOp1, CastInst *AddOp2,
- const TargetData &TD) {
- const CompositeType *CompTy;
- Value *OffsetVal = AddOp2->getOperand(0);
- Value *SrcPtr = 0; // Of type pointer to struct...
-
- if ((CompTy = getPointedToComposite(AddOp1->getType()))) {
- SrcPtr = AddOp1; // Handle the first case...
- } else if (CastInst *AddOp1c = dyn_cast<CastInst>(AddOp1)) {
- SrcPtr = AddOp1c->getOperand(0); // Handle the second case...
- CompTy = getPointedToComposite(SrcPtr->getType());
- }
-
- // Only proceed if we have detected all of our conditions successfully...
- if (!CompTy || !SrcPtr || !OffsetVal->getType()->isInteger())
- return false;
-
- std::vector<Value*> Indices;
- if (!ConvertibleToGEP(SrcPtr->getType(), OffsetVal, Indices, TD, &BI))
- return false; // Not convertible... perhaps next time
-
- if (getPointedToComposite(AddOp1->getType())) { // case 1
- PRINT_PEEPHOLE2("add-to-gep1:in", *AddOp2, *BI);
- } else {
- PRINT_PEEPHOLE3("add-to-gep2:in", *AddOp1, *AddOp2, *BI);
- }
-
- GetElementPtrInst *GEP = new GetElementPtrInst(SrcPtr, Indices,
- AddOp2->getName(), BI);
-
- Instruction *NCI = new CastInst(GEP, AddOp1->getType());
- ReplaceInstWithInst(BB->getInstList(), BI, NCI);
- PRINT_PEEPHOLE2("add-to-gep:out", *GEP, *NCI);
- return true;
-}
-
bool RPR::PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
Instruction *I = BI;
const TargetData &TD = getAnalysis<TargetData>();
if (CastInst *CI = dyn_cast<CastInst>(I)) {
Value *Src = CI->getOperand(0);
- Instruction *SrcI = dyn_cast<Instruction>(Src); // Nonnull if instr source
const Type *DestTy = CI->getType();
// Peephole optimize the following instruction:
if (!Src->hasName() && CI->hasName()) {
std::string Name = CI->getName();
CI->setName("");
- Src->setName(Name, &BB->getParent()->getSymbolTable());
+ Src->setName(Name);
}
// DCE the instruction now, to avoid having the iterative version of DCE
ConvertedTypes[CI] = CI->getType(); // Make sure the cast doesn't change
if (ExpressionConvertibleToType(Src, DestTy, ConvertedTypes, TD)) {
PRINT_PEEPHOLE3("CAST-SRC-EXPR-CONV:in ", *Src, *CI, *BB->getParent());
-
+
DEBUG(std::cerr << "\nCONVERTING SRC EXPR TYPE:\n");
{ // ValueMap must be destroyed before function verified!
ValueMapCache ValueMap;
if (Constant *CPV = dyn_cast<Constant>(E))
CI->replaceAllUsesWith(CPV);
-
+
PRINT_PEEPHOLE1("CAST-SRC-EXPR-CONV:out", *E);
DEBUG(std::cerr << "DONE CONVERTING SRC EXPR TYPE: \n"
<< *BB->getParent());
// Make sure the source doesn't change type
ConvertedTypes[Src] = Src->getType();
if (ValueConvertibleToType(CI, Src->getType(), ConvertedTypes, TD)) {
- PRINT_PEEPHOLE3("CAST-DEST-EXPR-CONV:in ", *Src, *CI, *BB->getParent());
+ //PRINT_PEEPHOLE3("CAST-DEST-EXPR-CONV:in ", *Src, *CI,
+ // *BB->getParent());
DEBUG(std::cerr << "\nCONVERTING EXPR TYPE:\n");
{ // ValueMap must be destroyed before function verified!
}
}
- // Otherwise find out it this cast is a cast to a pointer type, which is
- // then added to some other pointer, then loaded or stored through. If
- // so, convert the add into a getelementptr instruction...
- //
- if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
- if (HandleCastToPointer(BI, DestPTy, TD)) {
- BI = BB->begin(); // Rescan basic block. BI might be invalidated.
- ++NumGEPInstFormed;
- return true;
- }
- }
-
// Check to see if we are casting from a structure pointer to a pointer to
// the first element of the structure... to avoid munching other peepholes,
// we only let this happen if there are no add uses of the cast.
if (const StructType *CurSTy = dyn_cast<StructType>(CurCTy)) {
// Check for a zero element struct type... if we have one, bail.
if (CurSTy->getNumElements() == 0) break;
-
+
// Grab the first element of the struct type, which must lie at
// offset zero in the struct.
//
ElTy = CurSTy->getElementType(0);
} else {
- ElTy = cast<ArrayType>(CurCTy)->getElementType();
+ ElTy = cast<SequentialType>(CurCTy)->getElementType();
}
// Insert a zero to index through this type...
// Did we find what we're looking for?
if (ElTy->isLosslesslyConvertibleTo(DestPointedTy)) break;
-
+
// Nope, go a level deeper.
++Depth;
CurCTy = dyn_cast<CompositeType>(ElTy);
ElTy = 0;
}
-
+
// Did we find what we were looking for? If so, do the transformation
if (ElTy) {
PRINT_PEEPHOLE1("cast-for-first:in", *CI);
// the old src value.
//
CI->setOperand(0, GEP);
-
+
PRINT_PEEPHOLE2("cast-for-first:out", *GEP, *CI);
++NumGEPInstFormed;
return true;
} else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
Value *Val = SI->getOperand(0);
Value *Pointer = SI->getPointerOperand();
-
+
// Peephole optimize the following instructions:
// %t = cast <T1>* %P to <T2> * ;; If T1 is losslessly convertible to T2
// store <T2> %V, <T2>* %t
//
- // Into:
+ // Into:
// %t = cast <T2> %V to <T1>
// store <T1> %t2, <T1>* %P
//
Value *Pointer = LI->getOperand(0);
const Type *PtrElType =
cast<PointerType>(Pointer->getType())->getElementType();
-
+
// Peephole optimize the following instructions:
// %Val = cast <T1>* to <T2>* ;; If T1 is losslessly convertible to T2
// %t = load <T2>* %P
//
- // Into:
+ // Into:
// %t = load <T1>* %P
// %Val = cast <T1> to <T2>
//
// Create the new load instruction... loading the pre-casted value
LoadInst *NewLI = new LoadInst(CastSrc, LI->getName(), BI);
-
+
// Insert the new T cast instruction... stealing old T's name
CastInst *NCI = new CastInst(NewLI, LI->getType(), CI->getName());
return true;
}
- } else if (I->getOpcode() == Instruction::Add &&
- isa<CastInst>(I->getOperand(1))) {
-
- if (PeepholeOptimizeAddCast(BB, BI, I->getOperand(0),
- cast<CastInst>(I->getOperand(1)), TD)) {
- ++NumGEPInstFormed;
- return true;
- }
} else if (CallInst *CI = dyn_cast<CallInst>(I)) {
// If we have a call with all varargs arguments, convert the call to use the
// actual argument types present...
Constant *ConstantCallSrc = 0;
if (Constant *CS = dyn_cast<Constant>(CI->getCalledValue()))
ConstantCallSrc = CS;
- else if (GlobalValue *GV = dyn_cast<GlobalValue>(CI->getCalledValue()))
- ConstantCallSrc = ConstantPointerRef::get(GV);
if (ConstantCallSrc)
NewCast = ConstantExpr::getCast(ConstantCallSrc, NewPFunTy);
NewCast = new CastInst(CI->getCalledValue(), NewPFunTy,
CI->getCalledValue()->getName()+"_c",CI);
- // Strip off unneeded CPR's.
- if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(NewCast))
- NewCast = CPR->getValue();
-
// Create a new call instruction...
CallInst *NewCall = new CallInst(NewCast,
std::vector<Value*>(CI->op_begin()+1, CI->op_end()));
+ if (CI->isTailCall()) NewCall->setTailCall();
+ NewCall->setCallingConv(CI->getCallingConv());
++BI;
ReplaceInstWithInst(CI, NewCall);
-
+
++NumVarargCallChanges;
return true;
}
for (BasicBlock::iterator BI = BB->begin(); BI != BB->end();) {
DEBUG(std::cerr << "LevelRaising: " << *BI);
if (dceInstruction(BI) || doConstantPropagation(BI)) {
- Changed = true;
+ Changed = true;
++NumDCEorCP;
DEBUG(std::cerr << "***\t\t^^-- Dead code eliminated!\n");
} else if (PeepholeOptimize(BB, BI)) {
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