qzdoom/src/r_compiler/ssa/ssa_ubyte_ptr.cpp

#include "r_compiler/llvm_include.h"
#include "ssa_ubyte_ptr.h"
#include "ssa_scope.h"

SSAUBytePtr::SSAUBytePtr()
: v(0)
{
}

SSAUBytePtr::SSAUBytePtr(llvm::Value *v)
: v(v)
{
}

llvm::Type *SSAUBytePtr::llvm_type()
{
	return llvm::Type::getInt8PtrTy(SSAScope::context());
}

SSAUBytePtr SSAUBytePtr::operator[](SSAInt index) const
{
	return SSAUBytePtr::from_llvm(SSAScope::builder().CreateGEP(v, index.v, SSAScope::hint()));
}

SSAUByte SSAUBytePtr::load() const
{
	return SSAUByte::from_llvm(SSAScope::builder().CreateLoad(v, false, SSAScope::hint()));
}

SSAVec4i SSAUBytePtr::load_vec4ub() const
{
	// _mm_cvtsi32_si128 as implemented by clang:
	SSAInt i32 = SSAInt::from_llvm(SSAScope::builder().CreateLoad(SSAScope::builder().CreateBitCast(v, llvm::Type::getInt32PtrTy(SSAScope::context()), SSAScope::hint()), false, SSAScope::hint()));
	llvm::Value *v = SSAScope::builder().CreateInsertElement(llvm::UndefValue::get(SSAVec4i::llvm_type()), i32.v, SSAInt(0).v, SSAScope::hint());
	v = SSAScope::builder().CreateInsertElement(v, SSAInt(0).v, SSAInt(1).v, SSAScope::hint());
	v = SSAScope::builder().CreateInsertElement(v, SSAInt(0).v, SSAInt(2).v, SSAScope::hint());
	v = SSAScope::builder().CreateInsertElement(v, SSAInt(0).v, SSAInt(3).v, SSAScope::hint());
	SSAVec4i v4i = SSAVec4i::from_llvm(v);

	SSAVec8s low = SSAVec8s::bitcast(SSAVec16ub::shuffle(SSAVec16ub::bitcast(v4i), SSAVec16ub((unsigned char)0), 0, 16+0, 1, 16+1, 2, 16+2, 3, 16+3, 4, 16+4, 5, 16+5, 6, 16+6, 7, 16+7)); // _mm_unpacklo_epi8
	return SSAVec4i::extendlo(low); // _mm_unpacklo_epi16
/*
	llvm::PointerType *m4xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 4)->getPointerTo();
	llvm::Type *m4xint32type = llvm::VectorType::get(llvm::Type::getInt32Ty(SSAScope::context()), 4);
	llvm::Value *v4ub = SSAScope::builder().CreateLoad(SSAScope::builder().CreateBitCast(v, m4xint8typeptr, SSAScope::hint()), false, SSAScope::hint());
	return SSAVec4i::from_llvm(SSAScope::builder().CreateZExt(v4ub, m4xint32type));
*/
}

SSAVec16ub SSAUBytePtr::load_vec16ub() const
{
	llvm::PointerType *m16xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 16)->getPointerTo();
	return SSAVec16ub::from_llvm(SSAScope::builder().CreateLoad(SSAScope::builder().CreateBitCast(v, m16xint8typeptr, SSAScope::hint()), false, SSAScope::hint()));
}

SSAVec16ub SSAUBytePtr::load_unaligned_vec16ub() const
{
	llvm::PointerType *m16xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 16)->getPointerTo();
	return SSAVec16ub::from_llvm(SSAScope::builder().Insert(new llvm::LoadInst(SSAScope::builder().CreateBitCast(v, m16xint8typeptr, SSAScope::hint()), SSAScope::hint(), false, 4), SSAScope::hint()));
}

void SSAUBytePtr::store(const SSAUByte &new_value)
{
	SSAScope::builder().CreateStore(new_value.v, v, false);
}

void SSAUBytePtr::store_vec4ub(const SSAVec4i &new_value)
{
	// Store using saturate:
	SSAVec8s v8s(new_value, new_value);
	SSAVec16ub v16ub(v8s, v8s);
	
	llvm::Type *m16xint8type = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 16);
	llvm::PointerType *m4xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 4)->getPointerTo();
	std::vector<llvm::Constant*> constants;
	constants.push_back(llvm::ConstantInt::get(SSAScope::context(), llvm::APInt(32, 0)));
	constants.push_back(llvm::ConstantInt::get(SSAScope::context(), llvm::APInt(32, 1)));
	constants.push_back(llvm::ConstantInt::get(SSAScope::context(), llvm::APInt(32, 2)));
	constants.push_back(llvm::ConstantInt::get(SSAScope::context(), llvm::APInt(32, 3)));
	llvm::Value *mask = llvm::ConstantVector::get(constants);
	llvm::Value *val_vector = SSAScope::builder().CreateShuffleVector(v16ub.v, llvm::UndefValue::get(m16xint8type), mask, SSAScope::hint());
	SSAScope::builder().CreateStore(val_vector, SSAScope::builder().CreateBitCast(v, m4xint8typeptr, SSAScope::hint()), false);
}

void SSAUBytePtr::store_vec16ub(const SSAVec16ub &new_value)
{
	llvm::PointerType *m16xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 16)->getPointerTo();
	llvm::StoreInst *inst = SSAScope::builder().CreateStore(new_value.v, SSAScope::builder().CreateBitCast(v, m16xint8typeptr, SSAScope::hint()));

	// The following generates _mm_stream_si128, maybe!
	// llvm::MDNode *node = llvm::MDNode::get(SSAScope::context(), SSAScope::builder().getInt32(1));
	// inst->setMetadata(SSAScope::module()->getMDKindID("nontemporal"), node);
}

void SSAUBytePtr::store_unaligned_vec16ub(const SSAVec16ub &new_value)
{
	llvm::PointerType *m16xint8typeptr = llvm::VectorType::get(llvm::Type::getInt8Ty(SSAScope::context()), 16)->getPointerTo();
	llvm::StoreInst *inst = SSAScope::builder().CreateAlignedStore(new_value.v, SSAScope::builder().CreateBitCast(v, m16xint8typeptr, SSAScope::hint()), 4);
}