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// FlattenBarrierSubs, a pass to force inlining of non-kernel functions
// with barrier calls
//
// Copyright (c) 2018 Michal Babej / TUT
//
// 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/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include <llvm/IR/Instructions.h>
#include "Barrier.h"
#include "FlattenBarrierSubs.hh"
#include "LLVMUtils.h"
#include "Workgroup.h"
#include "WorkitemHandlerChooser.h"
POP_COMPILER_DIAGS
#include "pocl_llvm_api.h"
#include <iostream>
#include <string>
//#define DEBUG_FLATTEN_SUBS
#define PASS_NAME "flatten-barrier-subs"
#define PASS_CLASS pocl::FlattenBarrierSubs
#define PASS_DESC "Flatten subroutines with barriers and/or local arguments"
namespace pocl {
using namespace llvm;
static bool recursivelyInlineBarrierUsers(Function *F, bool ChangeInlineFlag) {
bool BarrierIsCalled = false;
#ifdef DEBUG_FLATTEN_SUBS
std::cerr << "### FlattenBarrierSubs: SCANNING " << F->getName().str()
<< std::endl;
#endif
for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE; ++BI) {
Instruction *Instr = dyn_cast<Instruction>(BI);
if (!llvm::isa<CallInst>(Instr))
continue;
CallInst *CallInstr = dyn_cast<CallInst>(Instr);
Function *Callee = CallInstr->getCalledFunction();
if ((Callee == nullptr) || Callee->getName().startswith("llvm."))
continue;
if (llvm::isa<pocl::Barrier>(CallInstr))
BarrierIsCalled = true;
// we cannot break the loop here, since we want to inline all functions
// that could call a barrier, not just the first one
else if (recursivelyInlineBarrierUsers(Callee, true))
BarrierIsCalled = true;
}
}
if (ChangeInlineFlag & BarrierIsCalled) {
F->removeFnAttr(Attribute::NoInline);
F->removeFnAttr(Attribute::OptimizeNone);
F->addFnAttr(Attribute::AlwaysInline);
F->setLinkage(llvm::GlobalValue::InternalLinkage);
#ifdef DEBUG_FLATTEN_SUBS
std::cerr << "### FlattenBarrierSubs: AlwaysInline ENABLED on "
<< F->getName().str() << std::endl;
#endif
}
return BarrierIsCalled;
}
static bool flattenBarrierSubs(Module &M) {
bool Changed = false;
std::string KernelName;
getModuleStringMetadata(M, "KernelName", KernelName);
for (llvm::Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
llvm::Function *F = &*I;
if (F->isDeclaration())
continue;
if (KernelName == F->getName().str() || isKernelToProcess(*F)) {
#ifdef DEBUG_FLATTEN_SUBS
std::cerr << "### FlattenBarrierSubs Pass running on " << KernelName
<< std::endl;
#endif
// we don't want to set alwaysInline on a Kernel, only its subroutines.
Changed = recursivelyInlineBarrierUsers(F, false);
}
}
return Changed;
}
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char FlattenBarrierSubs::ID = 0;
bool FlattenBarrierSubs::runOnModule(Module &M) {
return flattenBarrierSubs(M);
}
void FlattenBarrierSubs::getAnalysisUsage(llvm::AnalysisUsage &AU) const {
AU.addPreserved<WorkitemHandlerChooser>();
}
REGISTER_OLD_MPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::PreservedAnalyses
FlattenBarrierSubs::run(llvm::Module &M, llvm::ModuleAnalysisManager &AM) {
PreservedAnalyses PAChanged = PreservedAnalyses::none();
PAChanged.preserve<WorkitemHandlerChooser>();
return flattenBarrierSubs(M) ? PAChanged : PreservedAnalyses::all();
}
REGISTER_NEW_MPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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