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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
//
// The purpose of this pass is to fill in missing fast math flags for APIs
// that are using old LLVM IR and are lacking AllowContract and ApproxFunc
// flags.
// Policy is to set those flags when AllowReassoc (former AllowUnsafeAlgebra)
// is enabled on opcode.
//
//===----------------------------------------------------------------------===//
#include "FixFastMathFlags.hpp"
#include "IGCIRBuilder.h"
#include <llvm/IR/Function.h>
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CISACodeGen/helper.h"
#include "common/LLVMWarningsPush.hpp"
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
#define PASS_FLAG "fix-fast-math-flags"
#define PASS_DESCRIPTION "Fix FMF for APIs that are using legacy IR"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(FixFastMathFlags, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_END(FixFastMathFlags, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char FixFastMathFlags::ID = 0;
FixFastMathFlags::FixFastMathFlags() : FunctionPass(ID)
{
initializeFixFastMathFlagsPass(*PassRegistry::getPassRegistry());
}
bool FixFastMathFlags::runOnFunction(Function& F)
{
for (auto& bb : F)
{
for (auto& inst : bb)
{
if (isa<FPMathOperator>(inst))
{
if (inst.getFastMathFlags().allowReassoc())
{
m_changed = true;
FastMathFlags flags = inst.getFastMathFlags();
flags.setAllowContract(true);
flags.setApproxFunc();
inst.setFastMathFlags(flags);
}
}
}
}
visit(F);
return m_changed;
}
void FixFastMathFlags::visitFCmpInst(FCmpInst& FC)
{
if (isNaNCheck(FC)) {
FastMathFlags FMF;
FMF.clear();
FC.copyFastMathFlags(FMF);
}
}
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