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Eliminated the MemAccessInst class, folding contents into GEP class.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2002-08-22 23:37:20 +00:00
parent d145c2172f
commit cc63f1c674
13 changed files with 114 additions and 184 deletions
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29
lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp
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@@ -47,8 +47,8 @@ DecomposePass::runOnBasicBlock(BasicBlock &BB)
{
bool Changed = false;
for (BasicBlock::iterator II = BB.begin(); II != BB.end(); ) {
if (MemAccessInst *MAI = dyn_cast<MemAccessInst>(&*II))
if (MAI->getNumIndices() >= 2) {
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&*II))
if (GEP->getNumIndices() >= 2) {
Changed |= decomposeArrayRef(II); // always modifies II
continue;
}
@@ -64,7 +64,7 @@ IsZero(Value* idx)
return (isa<ConstantInt>(idx) && cast<ConstantInt>(idx)->isNullValue());
}
// For any MemAccessInst with 2 or more array and structure indices:
// For any GetElementPtrInst with 2 or more array and structure indices:
//
// opCode CompositeType* P, [uint|ubyte] idx1, ..., [uint|ubyte] idxN
//
@@ -88,9 +88,9 @@ IsZero(Value* idx)
bool
DecomposePass::decomposeArrayRef(BasicBlock::iterator &BBI)
{
MemAccessInst &MAI = cast<MemAccessInst>(*BBI);
BasicBlock *BB = MAI.getParent();
Value *LastPtr = MAI.getPointerOperand();
GetElementPtrInst &GEP = cast<GetElementPtrInst>(*BBI);
BasicBlock *BB = GEP.getParent();
Value *LastPtr = GEP.getPointerOperand();
// Remove the instruction from the stream
BB->getInstList().remove(BBI);
@@ -99,12 +99,12 @@ DecomposePass::decomposeArrayRef(BasicBlock::iterator &BBI)
std::vector<Instruction*> NewInsts;
// Process each index except the last one.
User::const_op_iterator OI = MAI.idx_begin(), OE = MAI.idx_end();
User::const_op_iterator OI = GEP.idx_begin(), OE = GEP.idx_end();
for (; OI+1 != OE; ++OI) {
std::vector<Value*> Indices;
// If this is the first index and is 0, skip it and move on!
if (OI == MAI.idx_begin()) {
if (OI == GEP.idx_begin()) {
if (IsZero(*OI)) continue;
} else
// Not the first index: include initial [0] to deref the last ptr
@@ -127,21 +127,14 @@ DecomposePass::decomposeArrayRef(BasicBlock::iterator &BBI)
Indices.push_back(Constant::getNullValue(Type::UIntTy));
Indices.push_back(*OI);
Instruction *NewI = 0;
switch(MAI.getOpcode()) {
case Instruction::GetElementPtr:
NewI = new GetElementPtrInst(LastPtr, Indices, MAI.getName());
break;
default:
assert(0 && "Unrecognized memory access instruction");
}
Instruction *NewI = new GetElementPtrInst(LastPtr, Indices, GEP.getName());
NewInsts.push_back(NewI);
// Replace all uses of the old instruction with the new
MAI.replaceAllUsesWith(NewI);
GEP.replaceAllUsesWith(NewI);
// Now delete the old instruction...
delete &MAI;
delete &GEP;
// Insert all of the new instructions...
BB->getInstList().insert(BBI, NewInsts.begin(), NewInsts.end());