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/*========================== begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#ifndef IGCLLVM_SUPPORT_MATHEXTRAS_H
#define IGCLLVM_SUPPORT_MATHEXTRAS_H
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/MathExtras.h"
namespace IGCLLVM {
using llvm::MulOverflow;
using llvm::SubOverflow;
inline uint64_t bit_floor(uint64_t A) {
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
return llvm::bit_floor(A);
#else
return llvm::PowerOf2Floor(A);
#endif
}
template <typename T> unsigned countr_zero(T Val) {
static_assert(std::is_unsigned_v<T>, "Only unsigned integral types are allowed.");
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
return llvm::countr_zero(Val);
#else
return llvm::countTrailingZeros(Val);
#endif
}
template <typename T> unsigned countl_zero(T Val) {
static_assert(std::is_unsigned_v<T>, "Only unsigned integral types are allowed.");
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
return llvm::countl_zero(Val);
#else
return llvm::countLeadingZeros(Val);
#endif
}
template <typename T> unsigned countl_one(T Val) {
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
return llvm::countl_one(Val);
#else
return llvm::countLeadingOnes(Val);
#endif
}
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
enum ZeroBehavior {
/// The returned value is undefined.
ZB_Undefined,
/// The returned value is numeric_limits<T>::max()
ZB_Max
};
#endif
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
template <typename T> T findFirstSet(T Val, IGCLLVM::ZeroBehavior ZB = IGCLLVM::ZB_Max) {
if (ZB == IGCLLVM::ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
return llvm::countr_zero(Val);
#else
template <typename T> T findFirstSet(T Val, llvm::ZeroBehavior ZB = llvm::ZB_Max) {
return llvm::findFirstSet(Val, ZB);
#endif
}
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
template <typename T> T findLastSet(T Val, IGCLLVM::ZeroBehavior ZB = IGCLLVM::ZB_Max) {
if (ZB == IGCLLVM::ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
return llvm::countl_zero(Val) ^ (std::numeric_limits<T>::digits - 1);
#else
template <typename T> T findLastSet(T Val, llvm::ZeroBehavior ZB = llvm::ZB_Max) {
return llvm::findLastSet(Val, ZB);
#endif
}
template <typename T> inline unsigned popcount(T Value) {
static_assert(std::is_unsigned_v<T>, "Only unsigned integral types are allowed.");
#if LLVM_VERSION_MAJOR > 16 && !defined(IGC_LLVM_TRUNK_REVISION)
return (unsigned)llvm::popcount(Value);
#else
return llvm::countPopulation(Value);
#endif
}
} // namespace IGCLLVM
#endif
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