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/*========================== begin_copyright_notice ============================
Copyright (C) 2024 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "AccuracyDecoratedCallsBiFResolution.hpp"
#include "llvmWrapper/IR/Type.h"
#include "llvm/IR/Attributes.h"
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CodeGenPublic.h"
#include "Probe/Assertion.h"
using namespace IGC;
using namespace llvm;
// Register pass to igc-opt
#define PASS_FLAG "igc-accuracy-decorated-calls-bif-resolution"
#define PASS_DESCRIPTION "Accuracy decorated calls BiF resolution"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(AccuracyDecoratedCallsBiFResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY,
PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(AccuracyDecoratedCallsBiFResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char AccuracyDecoratedCallsBiFResolution::ID = 0;
static inline const char *toString(Accuracy a) {
switch (a) {
default:
return "";
case HIGH_ACCURACY:
return "high accuracy";
case LOW_ACCURACY:
return "low accuracy";
case ENHANCED_PRECISION:
return "enhanced precision";
}
}
AccuracyDecoratedCallsBiFResolution::AccuracyDecoratedCallsBiFResolution() : ModulePass(ID) {
initializeAccuracyDecoratedCallsBiFResolutionPass(*PassRegistry::getPassRegistry());
}
void AccuracyDecoratedCallsBiFResolution::initNameToBuiltinMap() {
#define DEF_NAME_TO_BUILTIN(name, accuracy, builtin) m_nameToBuiltin[name][accuracy] = builtin;
#include "NameToBuiltinDef.hpp"
#undef DEF_NAME_TO_BUILTIN
}
bool AccuracyDecoratedCallsBiFResolution::runOnModule(Module &M) {
m_Module = static_cast<Module *>(&M);
initNameToBuiltinMap();
visit(M);
return m_changed;
}
void AccuracyDecoratedCallsBiFResolution::visitBinaryOperator(BinaryOperator &inst) {
// not supported by BiFModule yet;
return;
if (!inst.getType()->isFloatingPointTy())
return;
MDNode *MD = inst.getMetadata("fpbuiltin-max-error");
if (!MD)
return;
IGC_ASSERT_MESSAGE(!IGCLLVM::isBFloatTy(inst.getType()),
"bfloat type is not supported with fpbuiltin-max-error decoration");
if (IGCLLVM::isBFloatTy(inst.getType()))
return;
std::vector<Value *> args{};
args.push_back(inst.getOperand(0));
args.push_back(inst.getOperand(1));
StringRef maxErrorStr = cast<MDString>(MD->getOperand(0))->getString();
const std::string oldFuncName = inst.getOpcodeName();
Instruction *currInst = cast<Instruction>(&inst);
Function *newFunc =
getOrInsertNewFunc(oldFuncName, inst.getType(), args, {}, CallingConv::SPIR_FUNC, maxErrorStr, currInst);
CallInst *newCall = CallInst::Create(newFunc, args, inst.getName(), &inst);
llvm::Attribute attr = llvm::Attribute::get(inst.getContext(), "fpbuiltin-max-error", maxErrorStr);
newCall->addFnAttr(attr);
inst.replaceAllUsesWith(newCall);
inst.eraseFromParent();
}
void AccuracyDecoratedCallsBiFResolution::visitCallInst(CallInst &callInst) {
AttributeList attributeList = callInst.getAttributes();
AttributeSet callAttributes = attributeList.getFnAttrs();
if (!callAttributes.hasAttribute("fpbuiltin-max-error"))
return;
Function *F = callInst.getCalledFunction();
IGC_ASSERT_MESSAGE(nullptr != F, "Called function is null");
if (!F)
return;
IGC_ASSERT_MESSAGE(!IGCLLVM::isBFloatTy(F->getType()),
"bfloat type is not supported with fpbuiltin-max-error decoration");
if (IGCLLVM::isBFloatTy(F->getType()))
return;
std::vector<Value *> args{};
for (const auto &arg : callInst.args())
args.push_back(arg);
llvm::Attribute maxErrAttr = callAttributes.getAttribute("fpbuiltin-max-error");
StringRef maxErrorStr = maxErrAttr.getValueAsString();
Instruction *currInst = cast<Instruction>(&callInst);
Function *newFunc = getOrInsertNewFunc(F->getName(), F->getReturnType(), args, F->getAttributes(),
F->getCallingConv(), maxErrorStr, currInst);
CallInst *newCall = CallInst::Create(newFunc, args, callInst.getName(), &callInst);
newCall->setCallingConv(callInst.getCallingConv());
newCall->setAttributes(callInst.getAttributes());
callInst.replaceAllUsesWith(newCall);
callInst.eraseFromParent();
}
Function *AccuracyDecoratedCallsBiFResolution::getOrInsertNewFunc(
const StringRef oldFuncName, Type *funcType, const ArrayRef<Value *> args, const AttributeList attributes,
CallingConv::ID callingConv, const StringRef maxErrorStr, const Instruction *currInst) {
double maxError = 0;
maxErrorStr.getAsDouble(maxError);
double ULPCutOff = funcType->isFloatTy() ? 0x1 << 12 : 0x1 << 26; // 2^12 : 2^26
const Accuracy accuracy = getAccuracy(maxError, ULPCutOff, currInst);
std::vector<Type *> argTypes{};
for (const auto &arg : args)
argTypes.push_back(arg->getType());
FunctionType *FT = FunctionType::get(funcType, argTypes, false);
std::string newFuncName = getFunctionName(oldFuncName, accuracy, currInst);
Function *newFunc = cast<Function>(m_Module->getOrInsertFunction(newFuncName, FT, attributes).getCallee());
IGC_ASSERT(nullptr != newFunc);
newFunc->setCallingConv(callingConv);
m_changed = true;
return newFunc;
}
std::string AccuracyDecoratedCallsBiFResolution::getFunctionName(const StringRef oldFuncName, Accuracy accuracy,
const Instruction *currInst) const {
if (!m_nameToBuiltin.count(oldFuncName.str())) {
// Temporary until we're certain of the mangling used for
// sinpi cospi tanpi asinpi acospi atanpi sincos sincospi
size_t idx = oldFuncName.find("_spirv_ocl_");
IGC_ASSERT(StringRef::npos != idx);
StringRef croppedName = oldFuncName.substr(idx);
if (!m_nameToBuiltin.count(croppedName.str()))
return oldFuncName.str(); // Function not found - don't change the name.
// Function found in map with cropped name. Get the mapping.
return getFunctionName(croppedName, accuracy, currInst);
}
if (!m_nameToBuiltin.at(oldFuncName.str()).count(accuracy)) {
std::string warningMessage = "Built-in function not found for " + oldFuncName.str() + " at " + toString(accuracy) +
". Choosing higher precision.";
getAnalysis<CodeGenContextWrapper>().getCodeGenContext()->EmitWarning(warningMessage.c_str(), currInst);
switch (accuracy) {
default:
IGC_ASSERT_MESSAGE(false, "Unreachable, NameToBuiltinDef.hpp is likely broken");
return oldFuncName.str();
case ENHANCED_PRECISION:
return getFunctionName(oldFuncName, LOW_ACCURACY, currInst);
case LOW_ACCURACY:
return getFunctionName(oldFuncName, HIGH_ACCURACY, currInst);
}
}
return m_nameToBuiltin.at(oldFuncName.str()).at(accuracy);
}
Accuracy AccuracyDecoratedCallsBiFResolution::getAccuracy(double maxError, double cutOff,
const Instruction *currInst) const {
if (maxError < 1.0)
getAnalysis<CodeGenContextWrapper>().getCodeGenContext()->EmitError(
"fpbuiltin-max-error can't have values below 1.0", currInst);
if (maxError < 4.0)
return HIGH_ACCURACY;
if (maxError < cutOff) // 2^12 (for f32) or 2^26 (for f64)
return LOW_ACCURACY;
return ENHANCED_PRECISION;
}
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