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/*========================== begin_copyright_notice ============================
Copyright (C) 2024 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/Optimizer/OpenCLPasses/PoisonFP64KernelsPass/PoisonFP64KernelsPass.h"
#include "Compiler/Optimizer/OpenCLPasses/KernelArgs/KernelArgs.hpp"
#include "Compiler/IGCPassSupport.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/Instructions.h>
#include <llvm/Analysis/CallGraph.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
char PoisonFP64Kernels::ID = 0;
const char *PoisonFP64Kernels::attributeName = "invalid_kernel(\"uses-fp64-math\")";
// Register pass to igc-opt
#define PASS_FLAG "igc-poison-fp64-kernels"
#define PASS_DESCRIPTION "Poison kernels using FP64 on unsupported platforms."
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(PoisonFP64Kernels, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(PoisonFP64Kernels, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
PoisonFP64Kernels::PoisonFP64Kernels(void) : CallGraphSCCPass(ID) {
initializePoisonFP64KernelsPass(*PassRegistry::getPassRegistry());
}
void PoisonFP64Kernels::markForRemoval(Function *F) {
if (fp64Functions.count(F) > 0)
return;
fp64FunctionsOrder.push_back(F);
fp64Functions.insert(F);
}
bool PoisonFP64Kernels::doInitialization(CallGraph &CG) {
fp64Functions.clear();
fp64FunctionsOrder.clear();
return false;
}
bool PoisonFP64Kernels::runOnSCC(CallGraphSCC &SCC) {
auto ctx = getAnalysis<CodeGenContextWrapper>().getCodeGenContext();
// If DP emu is enabled we don't need poison fp64 pass
if (ctx->m_hasDPEmu) {
return false;
}
bool modified = false;
for (CallGraphNode *Node : SCC) {
Function *F = Node->getFunction();
if (F == nullptr || F->isDeclaration())
continue;
bool markedCallee = false;
for (BasicBlock &BB : *F) {
for (Instruction &I : BB) {
auto *CB = dyn_cast<CallBase>(&I);
if (CB == nullptr)
continue;
Function *Callee = CB->getCalledFunction();
if (Callee && Callee->hasFnAttribute("uses-fp64-math")) {
F->addFnAttr("uses-fp64-math");
modified = true;
markForRemoval(Callee);
markedCallee = true;
}
}
}
if (markedCallee || F->hasFnAttribute("uses-fp64-math")) {
markForRemoval(F);
}
}
return modified;
}
static void poisonKernel(Function *Kernel) {
Module *M = Kernel->getParent();
LLVMContext &Ctx = M->getContext();
Kernel->removeFnAttr("uses-fp64-math");
Kernel->addFnAttr(PoisonFP64Kernels::attributeName);
Kernel->deleteBody();
BasicBlock *EntryBB = BasicBlock::Create(Ctx, "entry", Kernel);
ReturnInst::Create(Ctx, EntryBB);
}
bool PoisonFP64Kernels::doFinalization(CallGraph &CG) {
CodeGenContext *CGC = getAnalysis<CodeGenContextWrapper>().getCodeGenContext();
IGCMD::MetaDataUtils *MDUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
bool modified = false;
for (Function *F : reverse(fp64FunctionsOrder)) {
std::string msg = "Removing unsupported FP64 function: '" + F->getName().str() + "'";
CGC->EmitWarning(msg.c_str());
if (isEntryFunc(MDUtils, F)) {
poisonKernel(F);
} else {
F->eraseFromParent();
}
modified = true;
}
return modified;
}
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