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// LLVM pass to recursively inline kernels which are called by other kernels
//
// Copyright (c) 2020 Michal Babej / Tampere University
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "CompilerWarnings.h"
IGNORE_COMPILER_WARNING("-Wmaybe-uninitialized")
#include <llvm/ADT/Twine.h>
POP_COMPILER_DIAGS
IGNORE_COMPILER_WARNING("-Wunused-parameter")
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "InlineKernels.hh"
#include "LLVMUtils.h"
#include "WorkitemHandlerChooser.h"
POP_COMPILER_DIAGS
//#define DEBUG_INLINE_KERNELS
#include "pocl_llvm_api.h"
#include <iostream>
#include <string>
#define PASS_NAME "inline-kernels"
#define PASS_CLASS pocl::InlineKernels
#define PASS_DESC \
"Inline kernels which are called from other kernels (only at the callsite)"
namespace pocl {
using namespace llvm;
static bool inlineKernelCalls(Function &F, NamedMDNode *KernelMDs) {
#ifdef DEBUG_INLINE_KERNELS
std::cerr << "checking " << F.getName().str() << " for inline-able kernels\n";
#endif
bool ChangedIter = false;
bool ChangedAny = false;
do {
ChangedIter = false;
Function::iterator I = F.begin();
for (Function::iterator E = F.end(); I != E; ++I) {
for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE;) {
CallInst *CInstr = dyn_cast<CallInst>(BI++);
if (CInstr == nullptr)
continue;
Function *Callee = CInstr->getCalledFunction();
if (Callee == nullptr)
continue;
if (!pocl::isKernelToProcess(*Callee)) {
#ifdef DEBUG_INLINE_KERNELS
std::cerr << "NOT a kernel, NOT Inlining call "
<< Callee->getName().str() << "\n";
#endif
if (inlineKernelCalls(*Callee, KernelMDs)) {
ChangedIter = true;
ChangedAny = true;
break;
} else
continue;
}
#ifdef DEBUG_INLINE_KERNELS
std::cerr << "Inlining kernel call " << Callee->getName().str() << "\n";
#endif
InlineFunctionInfo IFI;
llvm::InlineFunction(*CInstr, IFI);
ChangedIter = true;
ChangedAny = true;
break;
}
if (ChangedIter)
break;
}
} while (ChangedIter);
return ChangedAny;
}
static bool inlineKernels(Function &F) {
SmallPtrSet<Function *, 8> functions_to_inline;
SmallVector<Value *, 8> pending;
Module *M = F.getParent();
std::string KernelName;
getModuleStringMetadata(*M, "KernelName", KernelName);
if (F.getName().str() != KernelName)
return false;
if (F.isDeclaration())
return false;
const Module *m = F.getParent();
NamedMDNode *kernels = m->getNamedMetadata("opencl.kernels");
bool changed = inlineKernelCalls(F, kernels);
#ifdef DEBUG_INLINE_KERNELS
if (changed) {
std::cerr << "******************************************************\n";
std::cerr << "After inlineKernelCalls:\n";
m->dump();
std::cerr << "******************************************************\n";
}
#endif
return changed;
}
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char InlineKernels::ID = 0;
bool InlineKernels::runOnFunction(Function &F) { return inlineKernels(F); }
void InlineKernels::getAnalysisUsage(llvm::AnalysisUsage &AU) const {
AU.addPreserved<WorkitemHandlerChooser>();
}
REGISTER_OLD_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::PreservedAnalyses InlineKernels::run(llvm::Function &F,
llvm::FunctionAnalysisManager &AM) {
PreservedAnalyses PAChanged = PreservedAnalyses::none();
PAChanged.preserve<WorkitemHandlerChooser>();
return inlineKernels(F) ? PAChanged : PreservedAnalyses::all();
}
REGISTER_NEW_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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