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Diffstat (limited to 'llvm/include/llvm/Support/MathExtras.h')
-rw-r--r--llvm/include/llvm/Support/MathExtras.h77
1 files changed, 42 insertions, 35 deletions
diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index 37b9669cbeed9..16da3046c8ced 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -14,10 +14,11 @@
#define LLVM_SUPPORT_MATHEXTRAS_H
#include "llvm/Support/Compiler.h"
-#include "llvm/Support/SwapByteOrder.h"
#include <algorithm>
#include <cassert>
#include <climits>
+#include <cmath>
+#include <cstdint>
#include <cstring>
#include <limits>
#include <type_traits>
@@ -312,6 +313,34 @@ T reverseBits(T Val) {
return Val;
}
+#if __has_builtin(__builtin_bitreverse8)
+template<>
+inline uint8_t reverseBits<uint8_t>(uint8_t Val) {
+ return __builtin_bitreverse8(Val);
+}
+#endif
+
+#if __has_builtin(__builtin_bitreverse16)
+template<>
+inline uint16_t reverseBits<uint16_t>(uint16_t Val) {
+ return __builtin_bitreverse16(Val);
+}
+#endif
+
+#if __has_builtin(__builtin_bitreverse32)
+template<>
+inline uint32_t reverseBits<uint32_t>(uint32_t Val) {
+ return __builtin_bitreverse32(Val);
+}
+#endif
+
+#if __has_builtin(__builtin_bitreverse64)
+template<>
+inline uint64_t reverseBits<uint64_t>(uint64_t Val) {
+ return __builtin_bitreverse64(Val);
+}
+#endif
+
// NOTE: The following support functions use the _32/_64 extensions instead of
// type overloading so that signed and unsigned integers can be used without
// ambiguity.
@@ -364,14 +393,12 @@ constexpr inline bool isShiftedInt(int64_t x) {
/// to keep MSVC from (incorrectly) warning on isUInt<64> that we're shifting
/// left too many places.
template <unsigned N>
-constexpr inline typename std::enable_if<(N < 64), bool>::type
-isUInt(uint64_t X) {
+constexpr inline std::enable_if_t<(N < 64), bool> isUInt(uint64_t X) {
static_assert(N > 0, "isUInt<0> doesn't make sense");
return X < (UINT64_C(1) << (N));
}
template <unsigned N>
-constexpr inline typename std::enable_if<N >= 64, bool>::type
-isUInt(uint64_t X) {
+constexpr inline std::enable_if_t<N >= 64, bool> isUInt(uint64_t X) {
return true;
}
@@ -471,21 +498,6 @@ constexpr inline bool isPowerOf2_64(uint64_t Value) {
return Value && !(Value & (Value - 1));
}
-/// Return a byte-swapped representation of the 16-bit argument.
-inline uint16_t ByteSwap_16(uint16_t Value) {
- return sys::SwapByteOrder_16(Value);
-}
-
-/// Return a byte-swapped representation of the 32-bit argument.
-inline uint32_t ByteSwap_32(uint32_t Value) {
- return sys::SwapByteOrder_32(Value);
-}
-
-/// Return a byte-swapped representation of the 64-bit argument.
-inline uint64_t ByteSwap_64(uint64_t Value) {
- return sys::SwapByteOrder_64(Value);
-}
-
/// Count the number of ones from the most significant bit to the first
/// zero bit.
///
@@ -780,8 +792,7 @@ inline int64_t SignExtend64(uint64_t X, unsigned B) {
/// Subtract two unsigned integers, X and Y, of type T and return the absolute
/// value of the result.
template <typename T>
-typename std::enable_if<std::is_unsigned<T>::value, T>::type
-AbsoluteDifference(T X, T Y) {
+std::enable_if_t<std::is_unsigned<T>::value, T> AbsoluteDifference(T X, T Y) {
return std::max(X, Y) - std::min(X, Y);
}
@@ -789,7 +800,7 @@ AbsoluteDifference(T X, T Y) {
/// maximum representable value of T on overflow. ResultOverflowed indicates if
/// the result is larger than the maximum representable value of type T.
template <typename T>
-typename std::enable_if<std::is_unsigned<T>::value, T>::type
+std::enable_if_t<std::is_unsigned<T>::value, T>
SaturatingAdd(T X, T Y, bool *ResultOverflowed = nullptr) {
bool Dummy;
bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
@@ -806,7 +817,7 @@ SaturatingAdd(T X, T Y, bool *ResultOverflowed = nullptr) {
/// maximum representable value of T on overflow. ResultOverflowed indicates if
/// the result is larger than the maximum representable value of type T.
template <typename T>
-typename std::enable_if<std::is_unsigned<T>::value, T>::type
+std::enable_if_t<std::is_unsigned<T>::value, T>
SaturatingMultiply(T X, T Y, bool *ResultOverflowed = nullptr) {
bool Dummy;
bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
@@ -852,7 +863,7 @@ SaturatingMultiply(T X, T Y, bool *ResultOverflowed = nullptr) {
/// overflow. ResultOverflowed indicates if the result is larger than the
/// maximum representable value of type T.
template <typename T>
-typename std::enable_if<std::is_unsigned<T>::value, T>::type
+std::enable_if_t<std::is_unsigned<T>::value, T>
SaturatingMultiplyAdd(T X, T Y, T A, bool *ResultOverflowed = nullptr) {
bool Dummy;
bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
@@ -871,13 +882,12 @@ extern const float huge_valf;
/// Add two signed integers, computing the two's complement truncated result,
/// returning true if overflow occured.
template <typename T>
-typename std::enable_if<std::is_signed<T>::value, T>::type
-AddOverflow(T X, T Y, T &Result) {
+std::enable_if_t<std::is_signed<T>::value, T> AddOverflow(T X, T Y, T &Result) {
#if __has_builtin(__builtin_add_overflow)
return __builtin_add_overflow(X, Y, &Result);
#else
// Perform the unsigned addition.
- using U = typename std::make_unsigned<T>::type;
+ using U = std::make_unsigned_t<T>;
const U UX = static_cast<U>(X);
const U UY = static_cast<U>(Y);
const U UResult = UX + UY;
@@ -898,13 +908,12 @@ AddOverflow(T X, T Y, T &Result) {
/// Subtract two signed integers, computing the two's complement truncated
/// result, returning true if an overflow ocurred.
template <typename T>
-typename std::enable_if<std::is_signed<T>::value, T>::type
-SubOverflow(T X, T Y, T &Result) {
+std::enable_if_t<std::is_signed<T>::value, T> SubOverflow(T X, T Y, T &Result) {
#if __has_builtin(__builtin_sub_overflow)
return __builtin_sub_overflow(X, Y, &Result);
#else
// Perform the unsigned addition.
- using U = typename std::make_unsigned<T>::type;
+ using U = std::make_unsigned_t<T>;
const U UX = static_cast<U>(X);
const U UY = static_cast<U>(Y);
const U UResult = UX - UY;
@@ -922,14 +931,12 @@ SubOverflow(T X, T Y, T &Result) {
#endif
}
-
/// Multiply two signed integers, computing the two's complement truncated
/// result, returning true if an overflow ocurred.
template <typename T>
-typename std::enable_if<std::is_signed<T>::value, T>::type
-MulOverflow(T X, T Y, T &Result) {
+std::enable_if_t<std::is_signed<T>::value, T> MulOverflow(T X, T Y, T &Result) {
// Perform the unsigned multiplication on absolute values.
- using U = typename std::make_unsigned<T>::type;
+ using U = std::make_unsigned_t<T>;
const U UX = X < 0 ? (0 - static_cast<U>(X)) : static_cast<U>(X);
const U UY = Y < 0 ? (0 - static_cast<U>(Y)) : static_cast<U>(Y);
const U UResult = UX * UY;
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-07 20:13:19 +0000