#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
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:
}
}
- // 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.
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...
// 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);
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