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-rw-r--r--include/llvm/Support/MathExtras.h64
1 files changed, 46 insertions, 18 deletions
diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index ff41608f5f51..0abba62a2c23 100644
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -16,9 +16,9 @@
#include "llvm/Support/Compiler.h"
#include "llvm/Support/SwapByteOrder.h"
-#include "llvm/Support/type_traits.h"
-
+#include <cassert>
#include <cstring>
+#include <type_traits>
#ifdef _MSC_VER
#include <intrin.h>
@@ -44,8 +44,8 @@ enum ZeroBehavior {
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, std::size_t>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, std::size_t>::type
countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
(void)ZB;
@@ -71,8 +71,8 @@ countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, std::size_t>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, std::size_t>::type
countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) LLVM_DELETED_FUNCTION;
#if __GNUC__ >= 4 || _MSC_VER
@@ -115,8 +115,8 @@ inline std::size_t countTrailingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, std::size_t>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, std::size_t>::type
countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
(void)ZB;
@@ -137,8 +137,8 @@ countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, std::size_t>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, std::size_t>::type
countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) LLVM_DELETED_FUNCTION;
#if __GNUC__ >= 4 || _MSC_VER
@@ -181,8 +181,8 @@ inline std::size_t countLeadingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, T>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, T>::type
findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
@@ -192,8 +192,8 @@ findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, T>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, T>::type
findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// \brief Get the index of the last set bit starting from the least
@@ -204,8 +204,8 @@ findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, T>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, T>::type
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
@@ -218,8 +218,8 @@ findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, T>::type
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, T>::type
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// \brief Macro compressed bit reversal table for 256 bits.
@@ -230,6 +230,9 @@ static const unsigned char BitReverseTable256[256] = {
#define R4(n) R2(n), R2(n + 2 * 16), R2(n + 1 * 16), R2(n + 3 * 16)
#define R6(n) R4(n), R4(n + 2 * 4), R4(n + 1 * 4), R4(n + 3 * 4)
R6(0), R6(2), R6(1), R6(3)
+#undef R2
+#undef R4
+#undef R6
};
/// \brief Reverse the bits in \p Val.
@@ -258,6 +261,12 @@ inline uint32_t Lo_32(uint64_t Value) {
return static_cast<uint32_t>(Value);
}
+/// Make_64 - This functions makes a 64-bit integer from a high / low pair of
+/// 32-bit integers.
+inline uint64_t Make_64(uint32_t High, uint32_t Low) {
+ return ((uint64_t)High << 32) | (uint64_t)Low;
+}
+
/// isInt - Checks if an integer fits into the given bit width.
template<unsigned N>
inline bool isInt(int64_t x) {
@@ -541,6 +550,18 @@ inline uint64_t MinAlign(uint64_t A, uint64_t B) {
return (A | B) & (1 + ~(A | B));
}
+/// \brief Aligns \c Ptr to \c Alignment bytes, rounding up.
+///
+/// Alignment should be a power of two. This method rounds up, so
+/// AlignPtr(7, 4) == 8 and AlignPtr(8, 4) == 8.
+inline char *alignPtr(char *Ptr, size_t Alignment) {
+ assert(Alignment && isPowerOf2_64((uint64_t)Alignment) &&
+ "Alignment is not a power of two!");
+
+ return (char *)(((uintptr_t)Ptr + Alignment - 1) &
+ ~(uintptr_t)(Alignment - 1));
+}
+
/// NextPowerOf2 - Returns the next power of two (in 64-bits)
/// that is strictly greater than A. Returns zero on overflow.
inline uint64_t NextPowerOf2(uint64_t A) {
@@ -553,6 +574,13 @@ inline uint64_t NextPowerOf2(uint64_t A) {
return A + 1;
}
+/// Returns the power of two which is less than or equal to the given value.
+/// Essentially, it is a floor operation across the domain of powers of two.
+inline uint64_t PowerOf2Floor(uint64_t A) {
+ if (!A) return 0;
+ return 1ull << (63 - countLeadingZeros(A, ZB_Undefined));
+}
+
/// Returns the next integer (mod 2**64) that is greater than or equal to
/// \p Value and is a multiple of \p Align. \p Align must be non-zero.
///
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-08 23:30:16 +0000