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//===-- SPIRVSubtarget.cpp - SPIR-V Subtarget Information ------*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the SPIR-V specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
#include "SPIRVSubtarget.h"
#include "SPIRV.h"
#include "SPIRVGlobalRegistry.h"
#include "SPIRVLegalizerInfo.h"
#include "SPIRVRegisterBankInfo.h"
#include "SPIRVTargetMachine.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/TargetParser/Host.h"
using namespace llvm;
#define DEBUG_TYPE "spirv-subtarget"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "SPIRVGenSubtargetInfo.inc"
cl::list<SPIRV::Extension::Extension> Extensions(
"spirv-extensions", cl::desc("SPIR-V extensions"), cl::ZeroOrMore,
cl::Hidden,
cl::values(
clEnumValN(SPIRV::Extension::SPV_EXT_shader_atomic_float_add,
"SPV_EXT_shader_atomic_float_add",
"Adds atomic add instruction on floating-point numbers."),
clEnumValN(
SPIRV::Extension::SPV_EXT_shader_atomic_float16_add,
"SPV_EXT_shader_atomic_float16_add",
"Extends the SPV_EXT_shader_atomic_float_add extension to support "
"atomically adding to 16-bit floating-point numbers in memory."),
clEnumValN(
SPIRV::Extension::SPV_EXT_shader_atomic_float_min_max,
"SPV_EXT_shader_atomic_float_min_max",
"Adds atomic min and max instruction on floating-point numbers."),
clEnumValN(SPIRV::Extension::SPV_INTEL_arbitrary_precision_integers,
"SPV_INTEL_arbitrary_precision_integers",
"Allows generating arbitrary width integer types."),
clEnumValN(SPIRV::Extension::SPV_INTEL_optnone, "SPV_INTEL_optnone",
"Adds OptNoneINTEL value for Function Control mask that "
"indicates a request to not optimize the function."),
clEnumValN(SPIRV::Extension::SPV_INTEL_subgroups, "SPV_INTEL_subgroups",
"Allows work items in a subgroup to share data without the "
"use of local memory and work group barriers, and to "
"utilize specialized hardware to load and store blocks of "
"data from images or buffers."),
clEnumValN(SPIRV::Extension::SPV_KHR_uniform_group_instructions,
"SPV_KHR_uniform_group_instructions",
"Allows support for additional group operations within "
"uniform control flow."),
clEnumValN(SPIRV::Extension::SPV_KHR_no_integer_wrap_decoration,
"SPV_KHR_no_integer_wrap_decoration",
"Adds decorations to indicate that a given instruction does "
"not cause integer wrapping."),
clEnumValN(SPIRV::Extension::SPV_KHR_expect_assume,
"SPV_KHR_expect_assume",
"Provides additional information to a compiler, similar to "
"the llvm.assume and llvm.expect intrinsics."),
clEnumValN(SPIRV::Extension::SPV_KHR_bit_instructions,
"SPV_KHR_bit_instructions",
"This enables bit instructions to be used by SPIR-V modules "
"without requiring the Shader capability."),
clEnumValN(
SPIRV::Extension::SPV_KHR_linkonce_odr, "SPV_KHR_linkonce_odr",
"Allows to use the LinkOnceODR linkage type that is to let "
"a function or global variable to be merged with other functions "
"or global variables of the same name when linkage occurs."),
clEnumValN(SPIRV::Extension::SPV_INTEL_function_pointers,
"SPV_INTEL_function_pointers",
"Allows translation of function pointers.")));
// Compare version numbers, but allow 0 to mean unspecified.
static bool isAtLeastVer(uint32_t Target, uint32_t VerToCompareTo) {
return Target == 0 || Target >= VerToCompareTo;
}
SPIRVSubtarget::SPIRVSubtarget(const Triple &TT, const std::string &CPU,
const std::string &FS,
const SPIRVTargetMachine &TM)
: SPIRVGenSubtargetInfo(TT, CPU, /*TuneCPU=*/CPU, FS),
PointerSize(TM.getPointerSizeInBits(/* AS= */ 0)), SPIRVVersion(0),
OpenCLVersion(0), InstrInfo(),
FrameLowering(initSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
TargetTriple(TT) {
// The order of initialization is important.
initAvailableExtensions();
initAvailableExtInstSets();
GR = std::make_unique<SPIRVGlobalRegistry>(PointerSize);
CallLoweringInfo = std::make_unique<SPIRVCallLowering>(TLInfo, GR.get());
Legalizer = std::make_unique<SPIRVLegalizerInfo>(*this);
RegBankInfo = std::make_unique<SPIRVRegisterBankInfo>();
InstSelector.reset(
createSPIRVInstructionSelector(TM, *this, *RegBankInfo.get()));
}
SPIRVSubtarget &SPIRVSubtarget::initSubtargetDependencies(StringRef CPU,
StringRef FS) {
ParseSubtargetFeatures(CPU, /*TuneCPU=*/CPU, FS);
if (SPIRVVersion == 0)
SPIRVVersion = 14;
if (OpenCLVersion == 0)
OpenCLVersion = 22;
return *this;
}
bool SPIRVSubtarget::canUseExtension(SPIRV::Extension::Extension E) const {
return AvailableExtensions.contains(E);
}
bool SPIRVSubtarget::canUseExtInstSet(
SPIRV::InstructionSet::InstructionSet E) const {
return AvailableExtInstSets.contains(E);
}
bool SPIRVSubtarget::isAtLeastSPIRVVer(uint32_t VerToCompareTo) const {
return isAtLeastVer(SPIRVVersion, VerToCompareTo);
}
bool SPIRVSubtarget::isAtLeastOpenCLVer(uint32_t VerToCompareTo) const {
if (!isOpenCLEnv())
return false;
return isAtLeastVer(OpenCLVersion, VerToCompareTo);
}
// If the SPIR-V version is >= 1.4 we can call OpPtrEqual and OpPtrNotEqual.
bool SPIRVSubtarget::canDirectlyComparePointers() const {
return isAtLeastVer(SPIRVVersion, 14);
}
void SPIRVSubtarget::initAvailableExtensions() {
AvailableExtensions.clear();
if (!isOpenCLEnv())
return;
for (auto Extension : Extensions)
AvailableExtensions.insert(Extension);
}
// TODO: use command line args for this rather than just defaults.
// Must have called initAvailableExtensions first.
void SPIRVSubtarget::initAvailableExtInstSets() {
AvailableExtInstSets.clear();
if (!isOpenCLEnv())
AvailableExtInstSets.insert(SPIRV::InstructionSet::GLSL_std_450);
else
AvailableExtInstSets.insert(SPIRV::InstructionSet::OpenCL_std);
// Handle extended instruction sets from extensions.
if (canUseExtension(
SPIRV::Extension::SPV_AMD_shader_trinary_minmax_extension)) {
AvailableExtInstSets.insert(
SPIRV::InstructionSet::SPV_AMD_shader_trinary_minmax);
}
}
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