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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/Optimizer/OpenCLPasses/BIFTransforms/BIFTransforms.hpp"
#include "Compiler/IGCPassSupport.h"
#include "common/igc_regkeys.hpp"
#include "common/LLVMWarningsPush.hpp"
#include "llvm/IR/Module.h"
#include "llvm/IR/Function.h"
#include "llvm/ADT/StringRef.h"
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
namespace {
class BIFTransforms : public ModulePass {
public:
static char ID;
virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const { AU.setPreservesCFG(); }
BIFTransforms();
~BIFTransforms() {}
virtual bool runOnModule(Module &M);
virtual llvm::StringRef getPassName() const { return "BIFTransforms"; }
private:
// Replace some BI Functions with faster versions, such as
// length --> fast_length, etc.
bool replaceBIF(Function &F);
};
} // namespace
// Register pass to igc-opt
#define PASS_FLAG "igc-bif-transforms"
#define PASS_DESCRIPTION "Perform BIF-related transformations, such as replacing length with fast_length, etc"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(BIFTransforms, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_END(BIFTransforms, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char BIFTransforms::ID = 0;
BIFTransforms::BIFTransforms() : ModulePass(ID) { initializeBIFTransformsPass(*PassRegistry::getPassRegistry()); }
bool BIFTransforms::replaceBIF(Function &F) {
// replace
// length --> fast_length
// normalize --> fast_normaliez
// distance --> fast_distance
// As the fast version only exists for float/double in BIF, not half,
// here make sure F is not half before replacing.
Function::arg_iterator AI = F.arg_begin();
if (AI == F.arg_end()) {
return false;
}
Type *Ty = AI->getType();
if (Ty->isHalfTy() || (Ty->isVectorTy() && Ty->getContainedType(0)->isHalfTy())) {
return false;
}
bool changed = false;
StringRef name = F.getName();
if (name.startswith("_Z6length")) { // length --> fast_length
std::string newName("_Z11fast_length");
newName.append(name.data() + 9);
F.setName(newName);
changed = true;
} else if (name.startswith("_Z9normalize")) { // normalize --> fast_normalize
std::string newName("_Z14fast_normalize");
newName.append(name.data() + 12);
F.setName(newName);
changed = true;
} else if (name.startswith("_Z8distance")) { // distance --> fast_distance
std::string newName("_Z13fast_distance");
newName.append(name.data() + 11);
F.setName(newName);
changed = true;
}
return changed;
}
bool BIFTransforms::runOnModule(Module &M) {
// OCL builtin uses SPIR name mangling (Itanium C++ ABI + extension)
// mangledName (n) = _Z<lengthof(n)><n><type>
bool changed = false;
for (Function &F : M) {
if (F.isDeclaration()) {
if (IGC_IS_FLAG_ENABLED(EnableIntelFast) && replaceBIF(F)) {
changed = true;
}
}
}
return changed;
}
// Public interface to this pass
ModulePass *createBIFTransformsPass() { return new BIFTransforms(); }
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