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// LLVM function pass to remove all barrier calls.
//
// Copyright (c) 2016 Pekka Jääskeläinen / 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 "Barrier.h"
#include "LLVMUtils.h"
#include "RemoveBarrierCalls.h"
#include "VariableUniformityAnalysis.h"
#include "Workgroup.h"
#include "WorkitemHandlerChooser.h"
POP_COMPILER_DIAGS
#include <set>
#define PASS_NAME "remove-barriers"
#define PASS_CLASS pocl::RemoveBarrierCalls
#define PASS_DESC "Removes all barrier calls."
namespace pocl {
using namespace llvm;
static bool removeBarrierCalls(Function &F) {
// Collect the barrier calls to be removed first, not remove them
// instantly as it'd invalidate the iterators.
std::set<Instruction*> BarriersToRemove;
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<Barrier>(Instr)) {
BarriersToRemove.insert(Instr);
}
}
}
bool Changed = !BarriersToRemove.empty();
for (auto B : BarriersToRemove) {
B->eraseFromParent();
}
return Changed;
}
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char RemoveBarrierCalls::ID = 0;
bool RemoveBarrierCalls::runOnFunction(Function &F) {
return removeBarrierCalls(F);
}
void
RemoveBarrierCalls::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<VariableUniformityAnalysis>();
AU.addPreserved<WorkitemHandlerChooser>();
}
REGISTER_OLD_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::PreservedAnalyses
RemoveBarrierCalls::run(llvm::Function &F, llvm::FunctionAnalysisManager &AM) {
PreservedAnalyses PAChanged = PreservedAnalyses::none();
PAChanged.preserve<VariableUniformityAnalysis>();
PAChanged.preserve<WorkitemHandlerChooser>();
return removeBarrierCalls(F) ? PAChanged : PreservedAnalyses::all();
}
REGISTER_NEW_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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