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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 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/>.
*
* Author: Benjamin Segovia <benjamin.segovia@intel.com>
*/
/**
* \file llvm_to_gen.cpp
* \author Benjamin Segovia <benjamin.segovia@intel.com>
*/
#include "llvm/Config/llvm-config.h"
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR <= 2
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/DataLayout.h"
#else
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/DataLayout.h"
#endif /* LLVM_VERSION_MINOR <= 2 */
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/ADT/Triple.h"
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR <= 2
#include "llvm/Support/IRReader.h"
#else
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/SourceMgr.h"
#endif /* LLVM_VERSION_MINOR <= 2 */
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Scalar.h"
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >=5
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/Verifier.h"
#else
#include "llvm/Analysis/Verifier.h"
#include "llvm/Assembly/PrintModulePass.h"
#endif
#include "llvm/Analysis/CFGPrinter.h"
#include "llvm/llvm_gen_backend.hpp"
#include "llvm/llvm_to_gen.hpp"
#include "sys/cvar.hpp"
#include "sys/platform.hpp"
#include <clang/CodeGen/CodeGenAction.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <memory>
namespace gbe
{
BVAR(OCL_OUTPUT_LLVM, false);
BVAR(OCL_OUTPUT_CFG, false);
BVAR(OCL_OUTPUT_CFG_ONLY, false);
BVAR(OCL_OUTPUT_LLVM_BEFORE_EXTRA_PASS, false);
using namespace llvm;
void runFuntionPass(Module &mod, TargetLibraryInfo *libraryInfo)
{
FunctionPassManager FPM(&mod);
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
FPM.add(new DataLayoutPass(&mod));
#else
FPM.add(new DataLayout(&mod));
#endif
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >=5
FPM.add(createVerifierPass(true));
#else
FPM.add(createVerifierPass());
#endif
FPM.add(new TargetLibraryInfo(*libraryInfo));
FPM.add(createTypeBasedAliasAnalysisPass());
FPM.add(createBasicAliasAnalysisPass());
FPM.add(createCFGSimplificationPass());
FPM.add(createSROAPass());
FPM.add(createEarlyCSEPass());
FPM.add(createLowerExpectIntrinsicPass());
FPM.doInitialization();
for (Module::iterator I = mod.begin(),
E = mod.end(); I != E; ++I)
if (!I->isDeclaration())
FPM.run(*I);
FPM.doFinalization();
}
void runModulePass(Module &mod, TargetLibraryInfo *libraryInfo, int optLevel)
{
llvm::PassManager MPM;
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
MPM.add(new DataLayoutPass(&mod));
#else
MPM.add(new DataLayout(&mod));
#endif
MPM.add(new TargetLibraryInfo(*libraryInfo));
MPM.add(createTypeBasedAliasAnalysisPass());
MPM.add(createBasicAliasAnalysisPass());
MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
MPM.add(createIPSCCPPass()); // IP SCCP
MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
MPM.add(createPruneEHPass()); // Remove dead EH info
MPM.add(createBarrierNodupPass(false)); // remove noduplicate fnAttr before inlining.
MPM.add(createFunctionInliningPass(200000));
MPM.add(createBarrierNodupPass(true)); // restore noduplicate fnAttr after inlining.
MPM.add(createFunctionAttrsPass()); // Set readonly/readnone attrs
//MPM.add(createScalarReplAggregatesPass(64, true, -1, -1, 64))
if(optLevel > 0)
MPM.add(createSROAPass(/*RequiresDomTree*/ false));
MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
MPM.add(createJumpThreadingPass()); // Thread jumps.
MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createInstructionCombiningPass()); // Combine silly seq's
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createReassociatePass()); // Reassociate expressions
MPM.add(createLoopRotatePass()); // Rotate Loop
MPM.add(createLICMPass()); // Hoist loop invariants
MPM.add(createLoopUnswitchPass(true));
MPM.add(createInstructionCombiningPass());
MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars
MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
MPM.add(createLoopDeletionPass()); // Delete dead loops
MPM.add(createLoopUnrollPass()); // Unroll small loops
if(optLevel > 0)
MPM.add(createGVNPass()); // Remove redundancies
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
MPM.add(createSCCPPass()); // Constant prop with SCCP
// Run instcombine after redundancy elimination to exploit opportunities
// opened up by them.
MPM.add(createInstructionCombiningPass());
MPM.add(createJumpThreadingPass()); // Thread jumps
MPM.add(createCorrelatedValuePropagationPass());
MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
MPM.add(createAggressiveDCEPass()); // Delete dead instructions
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createInstructionCombiningPass()); // Clean up after everything.
MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
if(optLevel > 0) {
MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
MPM.add(createConstantMergePass()); // Merge dup global constants
}
MPM.run(mod);
}
bool llvmToGen(ir::Unit &unit, const char *fileName,const void* module, int optLevel)
{
std::string errInfo;
std::unique_ptr<llvm::raw_fd_ostream> o = NULL;
if (OCL_OUTPUT_LLVM_BEFORE_EXTRA_PASS || OCL_OUTPUT_LLVM)
o = std::unique_ptr<llvm::raw_fd_ostream>(new llvm::raw_fd_ostream(fileno(stdout), false));
// Get the module from its file
llvm::SMDiagnostic Err;
std::auto_ptr<Module> M;
if(fileName){
// only when module is null, Get the global LLVM context
llvm::LLVMContext& c = llvm::getGlobalContext();
M.reset(ParseIRFile(fileName, Err, c));
if (M.get() == 0) return false;
}
Module &mod = (module!=NULL)?*(llvm::Module*)module:*M.get();
Triple TargetTriple(mod.getTargetTriple());
TargetLibraryInfo *libraryInfo = new TargetLibraryInfo(TargetTriple);
libraryInfo->disableAllFunctions();
runFuntionPass(mod, libraryInfo);
runModulePass(mod, libraryInfo, optLevel);
llvm::PassManager passes;
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
passes.add(new DataLayoutPass(&mod));
#else
passes.add(new DataLayout(&mod));
#endif
// Print the code before further optimizations
if (OCL_OUTPUT_LLVM_BEFORE_EXTRA_PASS)
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
passes.add(createPrintModulePass(*o));
#else
passes.add(createPrintModulePass(&*o));
#endif
passes.add(createIntrinsicLoweringPass());
passes.add(createFunctionInliningPass(200000));
passes.add(createScalarReplAggregatesPass()); // Break up allocas
passes.add(createLoadStoreOptimizationPass());
passes.add(createRemoveGEPPass(unit));
passes.add(createConstantPropagationPass());
passes.add(createLowerSwitchPass());
passes.add(createPromoteMemoryToRegisterPass());
if(optLevel > 0)
passes.add(createGVNPass()); // Remove redundancies
passes.add(createPrintfParserPass());
passes.add(createScalarizePass()); // Expand all vector ops
passes.add(createDeadInstEliminationPass()); // Remove simplified instructions
passes.add(createCFGSimplificationPass()); // Merge & remove BBs
passes.add(createScalarizePass()); // Expand all vector ops
if(OCL_OUTPUT_CFG)
passes.add(createCFGPrinterPass());
if(OCL_OUTPUT_CFG_ONLY)
passes.add(createCFGOnlyPrinterPass());
passes.add(createGenPass(unit));
// Print the code extra optimization passes
if (OCL_OUTPUT_LLVM)
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
passes.add(createPrintModulePass(*o));
#else
passes.add(createPrintModulePass(&*o));
#endif
passes.run(mod);
return true;
}
} /* namespace gbe */
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