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Compute SizeOf() and OffsetOf() at compile time in more cases with the generic target.

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Really, we only have to be careful about the case where there is a vector of bools 
(i.e. a mask) involved, since the size of that isn't known at compile-time.
(Currently, at least.)
This commit is contained in:
Matt Pharr
2012-01-08 14:01:14 -08:00
parent ff6971fb15
commit 0ed11a7832
1 changed files with 39 additions and 2 deletions
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41
ispc.cpp
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@@ -358,10 +358,46 @@ Target::GetISAString() const {
}
static bool
lGenericTypeLayoutIndeterminate(LLVM_TYPE_CONST llvm::Type *type) {
if (type->isPrimitiveType() || type->isIntegerTy())
return false;
if (type == LLVMTypes::BoolVectorType ||
type == LLVMTypes::MaskType ||
type == LLVMTypes::Int1VectorType)
return true;
LLVM_TYPE_CONST llvm::ArrayType *at =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::ArrayType>(type);
if (at != NULL)
return lGenericTypeLayoutIndeterminate(at->getElementType());
LLVM_TYPE_CONST llvm::PointerType *pt =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::PointerType>(type);
if (pt != NULL)
return false;
LLVM_TYPE_CONST llvm::StructType *st =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::StructType>(type);
if (st != NULL) {
for (int i = 0; i < (int)st->getNumElements(); ++i)
if (lGenericTypeLayoutIndeterminate(st->getElementType(i)))
return true;
return false;
}
type->dump();
Assert(llvm::isa<LLVM_TYPE_CONST llvm::VectorType>(type));
return true;
}
llvm::Value *
Target::SizeOf(LLVM_TYPE_CONST llvm::Type *type,
llvm::BasicBlock *insertAtEnd) {
if (isa == Target::GENERIC && type->isPrimitiveType() == false) {
if (isa == Target::GENERIC &&
lGenericTypeLayoutIndeterminate(type)) {
llvm::Value *index[1] = { LLVMInt32(1) };
LLVM_TYPE_CONST llvm::PointerType *ptrType = llvm::PointerType::get(type, 0);
llvm::Value *voidPtr = llvm::ConstantPointerNull::get(ptrType);
@@ -396,7 +432,8 @@ Target::SizeOf(LLVM_TYPE_CONST llvm::Type *type,
llvm::Value *
Target::StructOffset(LLVM_TYPE_CONST llvm::Type *type, int element,
llvm::BasicBlock *insertAtEnd) {
if (isa == Target::GENERIC && type->isPrimitiveType() == false) {
if (isa == Target::GENERIC &&
lGenericTypeLayoutIndeterminate(type) == true) {
llvm::Value *indices[2] = { LLVMInt32(0), LLVMInt32(element) };
LLVM_TYPE_CONST llvm::PointerType *ptrType = llvm::PointerType::get(type, 0);
llvm::Value *voidPtr = llvm::ConstantPointerNull::get(ptrType);