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//===- DXILShaderFlags.cpp - DXIL Shader Flags helper objects -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file This file contains helper objects and APIs for working with DXIL
/// Shader Flags.
///
//===----------------------------------------------------------------------===//
#include "DXILShaderFlags.h"
#include "DirectX.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::dxil;
static void updateFunctionFlags(ComputedShaderFlags &CSF,
const Instruction &I) {
if (!CSF.Doubles)
CSF.Doubles = I.getType()->isDoubleTy();
if (!CSF.Doubles) {
for (Value *Op : I.operands())
CSF.Doubles |= Op->getType()->isDoubleTy();
}
if (CSF.Doubles) {
switch (I.getOpcode()) {
case Instruction::FDiv:
case Instruction::UIToFP:
case Instruction::SIToFP:
case Instruction::FPToUI:
case Instruction::FPToSI:
// TODO: To be set if I is a call to DXIL intrinsic DXIL::Opcode::Fma
// https://github.com/llvm/llvm-project/issues/114554
CSF.DX11_1_DoubleExtensions = true;
break;
}
}
}
void ModuleShaderFlags::initialize(const Module &M) {
// Collect shader flags for each of the functions
for (const auto &F : M.getFunctionList()) {
if (F.isDeclaration())
continue;
ComputedShaderFlags CSF;
for (const auto &BB : F)
for (const auto &I : BB)
updateFunctionFlags(CSF, I);
// Insert shader flag mask for function F
FunctionFlags.push_back({&F, CSF});
// Update combined shader flags mask
CombinedSFMask.merge(CSF);
}
llvm::sort(FunctionFlags);
}
void ComputedShaderFlags::print(raw_ostream &OS) const {
uint64_t FlagVal = (uint64_t) * this;
OS << formatv("; Shader Flags Value: {0:x8}\n;\n", FlagVal);
if (FlagVal == 0)
return;
OS << "; Note: shader requires additional functionality:\n";
#define SHADER_FEATURE_FLAG(FeatureBit, DxilModuleNum, FlagName, Str) \
if (FlagName) \
(OS << ";").indent(7) << Str << "\n";
#include "llvm/BinaryFormat/DXContainerConstants.def"
OS << "; Note: extra DXIL module flags:\n";
#define DXIL_MODULE_FLAG(DxilModuleBit, FlagName, Str) \
if (FlagName) \
(OS << ";").indent(7) << Str << "\n";
#include "llvm/BinaryFormat/DXContainerConstants.def"
OS << ";\n";
}
/// Return the shader flags mask of the specified function Func.
const ComputedShaderFlags &
ModuleShaderFlags::getFunctionFlags(const Function *Func) const {
const auto Iter = llvm::lower_bound(
FunctionFlags, Func,
[](const std::pair<const Function *, ComputedShaderFlags> FSM,
const Function *FindFunc) { return (FSM.first < FindFunc); });
assert((Iter != FunctionFlags.end() && Iter->first == Func) &&
"No Shader Flags Mask exists for function");
return Iter->second;
}
//===----------------------------------------------------------------------===//
// ShaderFlagsAnalysis and ShaderFlagsAnalysisPrinterPass
// Provide an explicit template instantiation for the static ID.
AnalysisKey ShaderFlagsAnalysis::Key;
ModuleShaderFlags ShaderFlagsAnalysis::run(Module &M,
ModuleAnalysisManager &AM) {
ModuleShaderFlags MSFI;
MSFI.initialize(M);
return MSFI;
}
PreservedAnalyses ShaderFlagsAnalysisPrinter::run(Module &M,
ModuleAnalysisManager &AM) {
const ModuleShaderFlags &FlagsInfo = AM.getResult<ShaderFlagsAnalysis>(M);
// Print description of combined shader flags for all module functions
OS << "; Combined Shader Flags for Module\n";
FlagsInfo.getCombinedFlags().print(OS);
// Print shader flags mask for each of the module functions
OS << "; Shader Flags for Module Functions\n";
for (const auto &F : M.getFunctionList()) {
if (F.isDeclaration())
continue;
auto SFMask = FlagsInfo.getFunctionFlags(&F);
OS << formatv("; Function {0} : {1:x8}\n;\n", F.getName(),
(uint64_t)(SFMask));
}
return PreservedAnalyses::all();
}
//===----------------------------------------------------------------------===//
// ShaderFlagsAnalysis and ShaderFlagsAnalysisPrinterPass
bool ShaderFlagsAnalysisWrapper::runOnModule(Module &M) {
MSFI.initialize(M);
return false;
}
char ShaderFlagsAnalysisWrapper::ID = 0;
INITIALIZE_PASS(ShaderFlagsAnalysisWrapper, "dx-shader-flag-analysis",
"DXIL Shader Flag Analysis", true, true)
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