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/*
* Copyright © 2012 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file llvm_barrier_nodup.cpp
*
* This pass is to remove or add noduplicate function attribute for barrier functions.
* Basically, we want to set NoDuplicate for those __gen_barrier_xxx functions. But if
* a sub function calls those barrier functions, the sub function will not be inlined
* in llvm's inlining pass. This is what we don't want. As inlining such a function in
* the caller is safe, we just don't want it to duplicate the call. So Introduce this
* pass to remove the NoDuplicate function attribute before the inlining pass and restore
* it after.
*
*/
#include "llvm_includes.hpp"
#include "llvm/llvm_gen_backend.hpp"
#include "sys/map.hpp"
using namespace llvm;
namespace gbe {
class BarrierNodup : public ModulePass
{
public:
static char ID;
BarrierNodup(bool nodup) :
ModulePass(ID), nodup(nodup) {}
void getAnalysisUsage(AnalysisUsage &AU) const {
}
#if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 40
virtual StringRef getPassName() const
#else
virtual const char *getPassName() const
#endif
{
return "SPIR backend: set barrier no duplicate attr";
}
virtual bool runOnModule(Module &M)
{
using namespace llvm;
bool changed = false;
for (auto &F : M) {
if (F.getName() == "__gen_ocl_barrier_local_and_global" ||
F.getName() == "__gen_ocl_barrier_local" ||
F.getName() == "__gen_ocl_barrier_global") {
if (nodup) {
if (!F.hasFnAttribute(Attribute::NoDuplicate)) {
F.addFnAttr(Attribute::NoDuplicate);
changed = true;
}
} else {
if (F.hasFnAttribute(Attribute::NoDuplicate)) {
auto attrs = F.getAttributes();
F.setAttributes(attrs.removeAttribute(M.getContext(),
#if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 50
AttributeList::FunctionIndex,
#else
AttributeSet::FunctionIndex,
#endif
Attribute::NoDuplicate));
changed = true;
}
}
}
}
return changed;
}
private:
bool nodup;
};
ModulePass *createBarrierNodupPass(bool Nodup) {
return new BarrierNodup(Nodup);
}
char BarrierNodup::ID = 0;
} // end namespace
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