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// AllocasToEntry, an LLVM pass to move allocas to the function entry node.
//
// Copyright (c) 2013 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/StringRef.h>
#include <llvm/ADT/Twine.h>
POP_COMPILER_DIAGS
IGNORE_COMPILER_WARNING("-Wunused-parameter")
#include <llvm/IR/Constants.h>
#include <llvm/IR/Instructions.h>
#include "AllocasToEntry.h"
#include "LLVMUtils.h"
POP_COMPILER_DIAGS
#include <iostream>
#include <sstream>
#define PASS_NAME "allocastoentry"
#define PASS_CLASS pocl::AllocasToEntry
#define PASS_DESC "Move allocas to the function entry node."
namespace pocl {
using namespace llvm;
static bool allocasToEntry(Function &F) {
// This solves problem with dynamic stack objects that are
// not supported by some targets (TCE).
Function::iterator I = F.begin();
Instruction *firstInsertionPt = &*(I++)->getFirstInsertionPt();
bool Changed = false;
for (Function::iterator E = F.end(); I != E; ++I) {
for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE;) {
AllocaInst *AllocaI = dyn_cast<AllocaInst>(BI++);
if (AllocaI && isa<ConstantInt>(AllocaI->getArraySize())) {
AllocaI->moveBefore(firstInsertionPt);
Changed = true;
}
}
}
return Changed;
}
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char AllocasToEntry::ID = 0;
bool AllocasToEntry::runOnFunction(Function &F) { return allocasToEntry(F); }
void AllocasToEntry::getAnalysisUsage(llvm::AnalysisUsage &AU) const {
// TODO do we preserve all ?
AU.setPreservesAll();
}
REGISTER_OLD_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::PreservedAnalyses AllocasToEntry::run(llvm::Function &F,
llvm::FunctionAnalysisManager &AM) {
allocasToEntry(F);
return PreservedAnalyses::all();
}
REGISTER_NEW_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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