DominatingValue<RValue>::saved_type
DominatingValue<RValue>::saved_type::save(CodeGenFunction &CGF, RValue rv) {
if (rv.isScalar()) {
llvm::Value *V = rv.getScalarVal();
// These automatically dominate and don't need to be saved.
if (!DominatingLLVMValue::needsSaving(V))
return saved_type(V, ScalarLiteral);
// Everything else needs an alloca.
Address addr =
CGF.CreateDefaultAlignTempAlloca(V->getType(), "saved-rvalue");
CGF.Builder.CreateStore(V, addr);
return saved_type(addr.getPointer(), ScalarAddress);
}
if (rv.isComplex()) {
CodeGenFunction::ComplexPairTy V = rv.getComplexVal();
llvm::Type *ComplexTy =
llvm::StructType::get(V.first->getType(), V.second->getType(),
(void*) nullptr);
Address addr = CGF.CreateDefaultAlignTempAlloca(ComplexTy, "saved-complex");
CGF.Builder.CreateStore(V.first,
CGF.Builder.CreateStructGEP(addr, 0, CharUnits()));
CharUnits offset = CharUnits::fromQuantity(
CGF.CGM.getDataLayout().getTypeAllocSize(V.first->getType()));
CGF.Builder.CreateStore(V.second,
CGF.Builder.CreateStructGEP(addr, 1, offset));
return saved_type(addr.getPointer(), ComplexAddress);
}
assert(rv.isAggregate());
Address V = rv.getAggregateAddress(); // TODO: volatile?
if (!DominatingLLVMValue::needsSaving(V.getPointer()))
return saved_type(V.getPointer(), AggregateLiteral,
V.getAlignment().getQuantity());
Address addr =
CGF.CreateTempAlloca(V.getType(), CGF.getPointerAlign(), "saved-rvalue");
CGF.Builder.CreateStore(V.getPointer(), addr);
return saved_type(addr.getPointer(), AggregateAddress,
V.getAlignment().getQuantity());
}
void IRGenFunction::emitMemCpy(Address dest, Address src, llvm::Value *size) {
// Map over to the inferior design of the LLVM intrinsic.
emitMemCpy(dest.getAddress(), src.getAddress(), size,
std::min(dest.getAlignment(), src.getAlignment()));
}
static void createStoreInstBefore(llvm::Value *value, Address addr,
llvm::Instruction *beforeInst) {
auto store = new llvm::StoreInst(value, addr.getPointer(), beforeInst);
store->setAlignment(addr.getAlignment().getQuantity());
}
