43222bd309
This pull request aims to remove any dependency on OpenCL/SPIR-V type information in LLVM IR metadata. While, using metadata might simplify and prettify the resulting SPIR-V output (and restore some of the information missed in the transformation to opaque pointers), the overall methodology for resolving kernel parameter types is highly inefficient. The high-level strategy is to assign kernel parameter types in this order: 1. Resolving the types using builtin function calls as mangled names must contain type information or by looking up builtin definition in SPIRVBuiltins.td. Then: - Assigning the type temporarily using an intrinsic and later setting the right SPIR-V type in SPIRVGlobalRegistry after IRTranslation - Inserting a bitcast 2. Defaulting to LLVM IR types (in case of pointers the generic i8* type or types from byval/byref attributes) In case of type incompatibility (e.g. parameter defined initially as sampler_t and later used as image_t) the error will be found early on before IRTranslation (in the SPIRVEmitIntrinsics pass).
77 lines
3.5 KiB
C++
77 lines
3.5 KiB
C++
//===-- SPIRVBuiltins.h - SPIR-V Built-in Functions -------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Lowering builtin function calls and types using their demangled names.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SPIRV_SPIRVBUILTINS_H
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#define LLVM_LIB_TARGET_SPIRV_SPIRVBUILTINS_H
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#include "SPIRVGlobalRegistry.h"
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#include "llvm/CodeGen/GlobalISel/CallLowering.h"
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#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
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namespace llvm {
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namespace SPIRV {
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/// Lowers a builtin funtion call using the provided \p DemangledCall skeleton
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/// and external instruction \p Set.
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///
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/// \return the lowering success status if the called function is a recognized
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/// builtin, std::nullopt otherwise.
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///
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/// \p DemangledCall is the skeleton of the lowered builtin function call.
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/// \p Set is the external instruction set containing the given builtin.
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/// \p OrigRet is the single original virtual return register if defined,
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/// Register(0) otherwise.
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/// \p OrigRetTy is the type of the \p OrigRet.
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/// \p Args are the arguments of the lowered builtin call.
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std::optional<bool> lowerBuiltin(const StringRef DemangledCall,
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InstructionSet::InstructionSet Set,
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MachineIRBuilder &MIRBuilder,
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const Register OrigRet, const Type *OrigRetTy,
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const SmallVectorImpl<Register> &Args,
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SPIRVGlobalRegistry *GR);
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/// Parses the provided \p ArgIdx argument base type in the \p DemangledCall
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/// skeleton. A base type is either a basic type (e.g. i32 for int), pointer
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/// element type (e.g. i8 for char*), or builtin type (TargetExtType).
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///
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/// \return LLVM Type or nullptr if unrecognized
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///
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/// \p DemangledCall is the skeleton of the lowered builtin function call.
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/// \p ArgIdx is the index of the argument to parse.
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Type *parseBuiltinCallArgumentBaseType(const StringRef DemangledCall,
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unsigned ArgIdx, LLVMContext &Ctx);
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/// Translates a string representing a SPIR-V or OpenCL builtin type to a
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/// TargetExtType that can be further lowered with lowerBuiltinType().
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///
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/// \return A TargetExtType representing the builtin SPIR-V type.
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///
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/// \p TypeName is the full string representation of the SPIR-V or OpenCL
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/// builtin type.
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TargetExtType *parseBuiltinTypeNameToTargetExtType(std::string TypeName,
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LLVMContext &Context);
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/// Handles the translation of the provided special opaque/builtin type \p Type
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/// to SPIR-V type. Generates the corresponding machine instructions for the
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/// target type or gets the already existing OpType<...> register from the
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/// global registry \p GR.
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///
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/// \return A machine instruction representing the OpType<...> SPIR-V type.
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///
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/// \p Type is the special opaque/builtin type to be lowered.
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SPIRVType *lowerBuiltinType(const Type *Type,
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AccessQualifier::AccessQualifier AccessQual,
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MachineIRBuilder &MIRBuilder,
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SPIRVGlobalRegistry *GR);
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} // namespace SPIRV
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} // namespace llvm
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#endif // LLVM_LIB_TARGET_SPIRV_SPIRVBUILTINS_H
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