mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-15 07:59:57 +00:00
59cd9f1e9f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1127 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
//===-- TransformInternals.cpp - Implement shared functions for transforms --=//
|
|
//
|
|
// This file defines shared functions used by the different components of the
|
|
// Transforms library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "TransformInternals.h"
|
|
#include "llvm/Method.h"
|
|
#include "llvm/Type.h"
|
|
|
|
// TargetData Hack: Eventually we will have annotations given to us by the
|
|
// backend so that we know stuff about type size and alignments. For now
|
|
// though, just use this, because it happens to match the model that GCC uses.
|
|
//
|
|
const TargetData TD("LevelRaise: Should be GCC though!");
|
|
|
|
// losslessCastableTypes - Return true if the types are bitwise equivalent.
|
|
// This predicate returns true if it is possible to cast from one type to
|
|
// another without gaining or losing precision, or altering the bits in any way.
|
|
//
|
|
bool losslessCastableTypes(const Type *T1, const Type *T2) {
|
|
if (!T1->isPrimitiveType() && !T1->isPointerType()) return false;
|
|
if (!T2->isPrimitiveType() && !T2->isPointerType()) return false;
|
|
|
|
if (T1->getPrimitiveID() == T2->getPrimitiveID())
|
|
return true; // Handles identity cast, and cast of differing pointer types
|
|
|
|
// Now we know that they are two differing primitive or pointer types
|
|
switch (T1->getPrimitiveID()) {
|
|
case Type::UByteTyID: return T2 == Type::SByteTy;
|
|
case Type::SByteTyID: return T2 == Type::UByteTy;
|
|
case Type::UShortTyID: return T2 == Type::ShortTy;
|
|
case Type::ShortTyID: return T2 == Type::UShortTy;
|
|
case Type::UIntTyID: return T2 == Type::IntTy;
|
|
case Type::IntTyID: return T2 == Type::UIntTy;
|
|
case Type::ULongTyID:
|
|
case Type::LongTyID:
|
|
case Type::PointerTyID:
|
|
return T2 == Type::ULongTy || T2 == Type::LongTy ||
|
|
T2->getPrimitiveID() == Type::PointerTyID;
|
|
default:
|
|
return false; // Other types have no identity values
|
|
}
|
|
}
|
|
|
|
|
|
// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
|
|
// with a value, then remove and delete the original instruction.
|
|
//
|
|
void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
|
|
BasicBlock::iterator &BI, Value *V) {
|
|
Instruction *I = *BI;
|
|
// Replaces all of the uses of the instruction with uses of the value
|
|
I->replaceAllUsesWith(V);
|
|
|
|
// Remove the unneccesary instruction now...
|
|
BIL.remove(BI);
|
|
|
|
// Make sure to propogate a name if there is one already...
|
|
if (I->hasName() && !V->hasName())
|
|
V->setName(I->getName(), BIL.getParent()->getSymbolTable());
|
|
|
|
// Remove the dead instruction now...
|
|
delete I;
|
|
}
|
|
|
|
|
|
// ReplaceInstWithInst - Replace the instruction specified by BI with the
|
|
// instruction specified by I. The original instruction is deleted and BI is
|
|
// updated to point to the new instruction.
|
|
//
|
|
void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
|
|
BasicBlock::iterator &BI, Instruction *I) {
|
|
assert(I->getParent() == 0 &&
|
|
"ReplaceInstWithInst: Instruction already inserted into basic block!");
|
|
|
|
// Insert the new instruction into the basic block...
|
|
BI = BIL.insert(BI, I)+1;
|
|
|
|
// Replace all uses of the old instruction, and delete it.
|
|
ReplaceInstWithValue(BIL, BI, I);
|
|
|
|
// Reexamine the instruction just inserted next time around the cleanup pass
|
|
// loop.
|
|
--BI;
|
|
}
|
|
|
|
|