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#include "slang-ir-lower-bit-cast.h"
#include "slang-ir-extract-value-from-type.h"
#include "slang-ir-insts.h"
#include "slang-ir-layout.h"
#include "slang-ir.h"
namespace Slang
{
struct BitCastLoweringContext
{
TargetProgram* targetProgram;
IRModule* module;
OrderedHashSet<IRInst*> workList;
DiagnosticSink* sink;
void addToWorkList(IRInst* inst)
{
for (auto ii = inst->getParent(); ii; ii = ii->getParent())
{
if (as<IRGeneric>(ii))
return;
}
if (workList.contains(inst))
return;
workList.add(inst);
}
void processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_BitCast:
processBitCast(inst);
break;
default:
break;
}
}
void processModule()
{
addToWorkList(module->getModuleInst());
while (workList.getCount() != 0)
{
IRInst* inst = workList.getLast();
workList.removeLast();
processInst(inst);
for (auto child = inst->getLastChild(); child; child = child->getPrevInst())
{
addToWorkList(child);
}
}
}
// Extract an object of `type` from `offset` in `src`.
IRInst* readObject(IRBuilder& builder, IRInst* src, IRType* type, uint32_t offset)
{
switch (type->getOp())
{
case kIROp_StructType:
{
auto structType = as<IRStructType>(type);
List<IRInst*> fieldValues;
for (auto field : structType->getFields())
{
IRIntegerValue fieldOffset = 0;
SLANG_RELEASE_ASSERT(
getNaturalOffset(targetProgram->getOptionSet(), field, &fieldOffset) ==
SLANG_OK);
auto fieldType = field->getFieldType();
auto fieldValue =
readObject(builder, src, fieldType, (uint32_t)(fieldOffset + offset));
fieldValues.add(fieldValue);
}
return builder.emitMakeStruct(structType, fieldValues);
}
break;
case kIROp_ArrayType:
{
auto arrayType = as<IRArrayType>(type);
auto arrayCount = as<IRIntLit>(arrayType->getElementCount());
SLANG_RELEASE_ASSERT(arrayCount && "bit_cast: array size must be fixed.");
List<IRInst*> elements;
IRSizeAndAlignment elementLayout;
SLANG_RELEASE_ASSERT(
getNaturalSizeAndAlignment(
targetProgram->getOptionSet(),
arrayType->getElementType(),
&elementLayout) == SLANG_OK);
for (IRIntegerValue i = 0; i < arrayCount->value.intVal; i++)
{
elements.add(readObject(
builder,
src,
arrayType->getElementType(),
(uint32_t)(offset + elementLayout.getStride() * i)));
}
return builder.emitMakeArray(
arrayType,
(UInt)arrayCount->value.intVal,
elements.getBuffer());
}
break;
case kIROp_VectorType:
{
auto vectorType = as<IRVectorType>(type);
auto elementCount = as<IRIntLit>(vectorType->getElementCount());
SLANG_RELEASE_ASSERT(elementCount && "bit_cast: vector size must be int literal.");
List<IRInst*> elements;
IRSizeAndAlignment elementLayout;
SLANG_RELEASE_ASSERT(
getNaturalSizeAndAlignment(
targetProgram->getOptionSet(),
vectorType->getElementType(),
&elementLayout) == SLANG_OK);
for (IRIntegerValue i = 0; i < elementCount->value.intVal; i++)
{
elements.add(readObject(
builder,
src,
vectorType->getElementType(),
(uint32_t)(offset + elementLayout.getStride() * i)));
}
return builder.emitMakeVector(
vectorType,
(UInt)elementCount->value.intVal,
elements.getBuffer());
}
break;
case kIROp_MatrixType:
{
// Assuming row-major order
auto matrixType = as<IRMatrixType>(type);
auto elementCount = as<IRIntLit>(matrixType->getRowCount());
SLANG_RELEASE_ASSERT(elementCount && "bit_cast: vector size must be int literal.");
List<IRInst*> elements;
auto elementType = builder.getVectorType(
matrixType->getElementType(),
matrixType->getColumnCount());
IRSizeAndAlignment elementLayout;
SLANG_RELEASE_ASSERT(
getNaturalSizeAndAlignment(
targetProgram->getOptionSet(),
elementType,
&elementLayout) == SLANG_OK);
for (IRIntegerValue i = 0; i < elementCount->value.intVal; i++)
{
elements.add(readObject(
builder,
src,
elementType,
(uint32_t)(offset + elementLayout.getStride() * i)));
}
return builder.emitMakeMatrix(
matrixType,
(UInt)elementCount->value.intVal,
elements.getBuffer());
}
break;
case kIROp_HalfType:
case kIROp_Int16Type:
case kIROp_UInt16Type:
{
auto object = extractValueAtOffset(builder, targetProgram, src, offset, 2);
object = builder.emitCast(builder.getUInt16Type(), object);
return builder.emitBitCast(type, object);
}
break;
case kIROp_IntType:
case kIROp_UIntType:
case kIROp_FloatType:
case kIROp_BoolType:
#if SLANG_PTR_IS_32
case kIROp_IntPtrType:
case kIROp_UIntPtrType:
#endif
{
auto object = extractValueAtOffset(builder, targetProgram, src, offset, 4);
object = builder.emitCast(builder.getUIntType(), object);
return builder.emitBitCast(type, object);
}
break;
case kIROp_DoubleType:
case kIROp_Int64Type:
case kIROp_UInt64Type:
#if SLANG_PTR_IS_64
case kIROp_IntPtrType:
case kIROp_UIntPtrType:
#endif
case kIROp_RawPointerType:
case kIROp_PtrType:
case kIROp_FuncType:
{
auto object = extractValueAtOffset(builder, targetProgram, src, offset, 8);
object = builder.emitCast(builder.getUInt64Type(), object);
return builder.emitBitCast(type, object);
}
break;
case kIROp_UInt8Type:
case kIROp_Int8Type:
{
auto object = extractValueAtOffset(builder, targetProgram, src, offset, 1);
object = builder.emitCast(builder.getUInt8Type(), object);
return builder.emitBitCast(type, object);
}
break;
default:
{
SLANG_UNEXPECTED("Unable to generate bit_cast code for the given type");
}
break;
}
}
void processBitCast(IRInst* inst)
{
auto operand = inst->getOperand(0);
auto fromType = operand->getDataType();
auto toType = inst->getDataType();
IRSizeAndAlignment toTypeSize;
getNaturalSizeAndAlignment(targetProgram->getOptionSet(), toType, &toTypeSize);
IRSizeAndAlignment fromTypeSize;
getNaturalSizeAndAlignment(targetProgram->getOptionSet(), fromType, &fromTypeSize);
if (as<IRBasicType>(fromType) != nullptr && as<IRBasicType>(toType) != nullptr)
{
if (fromTypeSize.size != toTypeSize.size)
sink->diagnose(
inst->sourceLoc,
Diagnostics::notEqualBitCastSize,
fromType,
fromTypeSize.size,
toType,
toTypeSize.size);
// Both fromType and toType are basic types, no processing needed.
return;
}
// Ignore cases we cannot handle yet.
if (as<IRResourceTypeBase>(fromType) || as<IRResourceTypeBase>(toType))
{
return;
}
if (as<IRPointerLikeType>(fromType) || as<IRPointerLikeType>(toType))
{
return;
}
if (as<IRSamplerStateTypeBase>(fromType) || as<IRSamplerStateTypeBase>(toType))
{
return;
}
if (fromTypeSize.size != toTypeSize.size)
sink->diagnose(
inst->sourceLoc,
Diagnostics::notEqualBitCastSize,
fromType,
fromTypeSize.size,
toType,
toTypeSize.size);
// Enumerate all fields in to-type and obtain its value from operand object.
IRBuilder builder(module);
builder.setInsertBefore(inst);
auto finalObject = readObject(builder, operand, toType, 0);
inst->replaceUsesWith(finalObject);
inst->removeAndDeallocate();
}
};
void lowerBitCast(TargetProgram* targetProgram, IRModule* module, DiagnosticSink* sink)
{
BitCastLoweringContext context;
context.module = module;
context.targetProgram = targetProgram;
context.sink = sink;
context.processModule();
}
} // namespace Slang
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