88e2bb4092
This change seeks to add support for vendor flavoured SPIRV - more specifically, AMDGCN flavoured SPIRV. The aim is to generate SPIRV that carries some extra bits of information that are only usable by AMDGCN targets, forfeiting absolute genericity to obtain greater expressiveness for target features: - AMDGCN inline ASM is allowed/supported, under the assumption that the [SPV_INTEL_inline_assembly](https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_inline_assembly.asciidoc) extension is enabled/used - AMDGCN target specific builtins are allowed/supported, under the assumption that e.g. the `--spirv-allow-unknown-intrinsics` option is enabled when using the downstream translator - the featureset matches the union of AMDGCN targets' features - the datalayout string is overspecified to affix both the program address space and the alloca address space, the latter under the assumption that the [SPV_INTEL_function_pointers](https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_function_pointers.asciidoc) extension is enabled/used, case in which the extant SPIRV datalayout string would lead to pointers to function pointing to the private address space, which would be wrong. Existing AMDGCN tests are extended to cover this new target. It is currently dormant / will require some additional changes, but I thought I'd rather put it up for review to get feedback as early as possible. I will note that an alternative option is to place this under AMDGPU, but that seems slightly less natural, since this is still SPIRV, albeit relaxed in terms of preconditions & constrained in terms of postconditions, and only guaranteed to be usable on AMDGCN targets (it is still possible to obtain pristine portable SPIRV through usage of the flavoured target, though).
132 lines
5.0 KiB
C++
132 lines
5.0 KiB
C++
//===--- SPIR.cpp - Implement SPIR and SPIR-V target feature support ------===//
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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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// This file implements SPIR and SPIR-V TargetInfo objects.
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//
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//===----------------------------------------------------------------------===//
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#include "SPIR.h"
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#include "AMDGPU.h"
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#include "Targets.h"
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#include "llvm/TargetParser/TargetParser.h"
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using namespace clang;
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using namespace clang::targets;
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void SPIRTargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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DefineStd(Builder, "SPIR", Opts);
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}
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void SPIR32TargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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SPIRTargetInfo::getTargetDefines(Opts, Builder);
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DefineStd(Builder, "SPIR32", Opts);
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}
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void SPIR64TargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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SPIRTargetInfo::getTargetDefines(Opts, Builder);
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DefineStd(Builder, "SPIR64", Opts);
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}
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void BaseSPIRVTargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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DefineStd(Builder, "SPIRV", Opts);
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}
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void SPIRVTargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
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}
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void SPIRV32TargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
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DefineStd(Builder, "SPIRV32", Opts);
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}
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void SPIRV64TargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
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DefineStd(Builder, "SPIRV64", Opts);
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}
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static const AMDGPUTargetInfo AMDGPUTI(llvm::Triple("amdgcn-amd-amdhsa"), {});
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ArrayRef<const char *> SPIRV64AMDGCNTargetInfo::getGCCRegNames() const {
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return AMDGPUTI.getGCCRegNames();
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}
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bool SPIRV64AMDGCNTargetInfo::initFeatureMap(
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llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef,
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const std::vector<std::string> &FeatureVec) const {
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llvm::AMDGPU::fillAMDGPUFeatureMap({}, getTriple(), Features);
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return TargetInfo::initFeatureMap(Features, Diags, {}, FeatureVec);
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}
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bool SPIRV64AMDGCNTargetInfo::validateAsmConstraint(
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const char *&Name, TargetInfo::ConstraintInfo &Info) const {
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return AMDGPUTI.validateAsmConstraint(Name, Info);
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}
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std::string
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SPIRV64AMDGCNTargetInfo::convertConstraint(const char *&Constraint) const {
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return AMDGPUTI.convertConstraint(Constraint);
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}
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ArrayRef<Builtin::Info> SPIRV64AMDGCNTargetInfo::getTargetBuiltins() const {
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return AMDGPUTI.getTargetBuiltins();
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}
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void SPIRV64AMDGCNTargetInfo::getTargetDefines(const LangOptions &Opts,
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MacroBuilder &Builder) const {
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BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
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DefineStd(Builder, "SPIRV64", Opts);
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Builder.defineMacro("__AMD__");
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Builder.defineMacro("__AMDGPU__");
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Builder.defineMacro("__AMDGCN__");
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}
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void SPIRV64AMDGCNTargetInfo::setAuxTarget(const TargetInfo *Aux) {
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assert(Aux && "Cannot invoke setAuxTarget without a valid auxiliary target!");
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// This is a 1:1 copy of AMDGPUTargetInfo::setAuxTarget()
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assert(HalfFormat == Aux->HalfFormat);
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assert(FloatFormat == Aux->FloatFormat);
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assert(DoubleFormat == Aux->DoubleFormat);
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// On x86_64 long double is 80-bit extended precision format, which is
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// not supported by AMDGPU. 128-bit floating point format is also not
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// supported by AMDGPU. Therefore keep its own format for these two types.
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auto SaveLongDoubleFormat = LongDoubleFormat;
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auto SaveFloat128Format = Float128Format;
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auto SaveLongDoubleWidth = LongDoubleWidth;
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auto SaveLongDoubleAlign = LongDoubleAlign;
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copyAuxTarget(Aux);
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LongDoubleFormat = SaveLongDoubleFormat;
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Float128Format = SaveFloat128Format;
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LongDoubleWidth = SaveLongDoubleWidth;
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LongDoubleAlign = SaveLongDoubleAlign;
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// For certain builtin types support on the host target, claim they are
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// supported to pass the compilation of the host code during the device-side
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// compilation.
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// FIXME: As the side effect, we also accept `__float128` uses in the device
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// code. To reject these builtin types supported in the host target but not in
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// the device target, one approach would support `device_builtin` attribute
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// so that we could tell the device builtin types from the host ones. This
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// also solves the different representations of the same builtin type, such
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// as `size_t` in the MSVC environment.
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if (Aux->hasFloat128Type()) {
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HasFloat128 = true;
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Float128Format = DoubleFormat;
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}
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}
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