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implement promotion of unions containing two packed types of the same width.

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This implements Transforms/ScalarRepl/union-packed.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32422 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-12-11 00:35:08 +00:00
parent e629ff0be8
commit 1dbea1598c
1 changed files with 30 additions and 15 deletions
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45
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -420,10 +420,10 @@ void SROA::CanonicalizeAllocaUsers(AllocationInst *AI) {
/// false.
///
/// There are three cases we handle here:
/// 1) An effectively integer union, where the pieces are stored into as
/// 1) An effectively-integer union, where the pieces are stored into as
/// smaller integers (common with byte swap and other idioms).
/// 2) A union of a vector and its elements. Here we turn element accesses
/// into insert/extract element operations.
/// 2) A union of vector types of the same size and potentially its elements.
/// Here we turn element accesses into insert/extract element operations.
/// 3) A union of scalar types, such as int/float or int/pointer. Here we
/// merge together into integers, allowing the xform to work with #1 as
/// well.
@ -447,8 +447,12 @@ static bool MergeInType(const Type *In, const Type *&Accum,
PTy->getElementType() == Accum) {
// In is a vector, and accum is an element: ok, remember In.
Accum = In;
} else if ((PTy = dyn_cast<PackedType>(In)) && isa<PackedType>(Accum) &&
PTy->getBitWidth() == cast<PackedType>(Accum)->getBitWidth()) {
// Two vectors of the same size: keep Accum.
} else {
// FIXME: Handle packed->packed.
// Cannot insert an short into a <4 x int> or handle
// <2 x int> -> <4 x int>
return true;
}
} else {
@ -512,8 +516,7 @@ const Type *SROA::CanConvertToScalar(Value *V, bool &IsNotTrivial) {
if (MergeInType(SI->getOperand(0)->getType(), UsedType, TD))
return 0;
} else if (CastInst *CI = dyn_cast<CastInst>(User)) {
if (!isa<PointerType>(CI->getType())) return 0;
} else if (BitCastInst *CI = dyn_cast<BitCastInst>(User)) {
IsNotTrivial = true;
const Type *SubTy = CanConvertToScalar(CI, IsNotTrivial);
if (!SubTy || MergeInType(SubTy, UsedType, TD)) return 0;
@ -627,10 +630,16 @@ void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
Value *NV = new LoadInst(NewAI, LI->getName(), LI);
if (NV->getType() != LI->getType()) {
if (const PackedType *PTy = dyn_cast<PackedType>(NV->getType())) {
// Must be an element access.
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
NV = new ExtractElementInst(NV, ConstantInt::get(Type::UIntTy, Elt),
"tmp", LI);
// If the result alloca is a packed type, this is either an element
// access or a bitcast to another packed type.
if (isa<PackedType>(LI->getType())) {
NV = new BitCastInst(NV, LI->getType(), LI->getName(), LI);
} else {
// Must be an element access.
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
NV = new ExtractElementInst(NV, ConstantInt::get(Type::UIntTy, Elt),
"tmp", LI);
}
} else if (isa<PointerType>(NV->getType())) {
assert(isa<PointerType>(LI->getType()));
// Must be ptr->ptr cast. Anything else would result in NV being
@ -675,11 +684,17 @@ void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
Value *Old = new LoadInst(NewAI, NewAI->getName()+".in", SI);
if (const PackedType *PTy = dyn_cast<PackedType>(AllocaType)) {
// Must be an element insertion.
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
SV = new InsertElementInst(Old, SV,
ConstantInt::get(Type::UIntTy, Elt),
"tmp", SI);
// If the result alloca is a packed type, this is either an element
// access or a bitcast to another packed type.
if (isa<PackedType>(SV->getType())) {
SV = new BitCastInst(SV, AllocaType, SV->getName(), SI);
} else {
// Must be an element insertion.
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
SV = new InsertElementInst(Old, SV,
ConstantInt::get(Type::UIntTy, Elt),
"tmp", SI);
}
} else {
// If SV is a float, convert it to the appropriate integer type.
// If it is a pointer, do the same, and also handle ptr->ptr casts