mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
4ff3f20540
According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
566 lines
17 KiB
C
566 lines
17 KiB
C
#ifndef INTERNAL_BITS_H /*-*-C-*-vi:se ft=c:*/
|
|
#define INTERNAL_BITS_H
|
|
/**
|
|
* @file
|
|
* @author Ruby developers <ruby-core@ruby-lang.org>
|
|
* @copyright This file is a part of the programming language Ruby.
|
|
* Permission is hereby granted, to either redistribute and/or
|
|
* modify this file, provided that the conditions mentioned in the
|
|
* file COPYING are met. Consult the file for details.
|
|
* @brief Internal header for bitwise integer algorithms.
|
|
* @see Henry S. Warren Jr., "Hacker's Delight" (2nd ed.), 2013.
|
|
* @see SEI CERT C Coding Standard INT32-C. "Ensure that operations on
|
|
* signed integers do not result in overflow"
|
|
* @see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
|
|
* @see https://clang.llvm.org/docs/LanguageExtensions.html#builtin-rotateleft
|
|
* @see https://clang.llvm.org/docs/LanguageExtensions.html#builtin-rotateright
|
|
* @see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/byteswap-uint64-byteswap-ulong-byteswap-ushort
|
|
* @see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/rotl-rotl64-rotr-rotr64
|
|
* @see https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64
|
|
* @see https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanreverse-bitscanreverse64
|
|
* @see https://docs.microsoft.com/en-us/cpp/intrinsics/lzcnt16-lzcnt-lzcnt64
|
|
* @see https://docs.microsoft.com/en-us/cpp/intrinsics/popcnt16-popcnt-popcnt64
|
|
* @see https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_lzcnt_u32
|
|
* @see https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_tzcnt_u32
|
|
* @see https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rotl64
|
|
* @see https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rotr64
|
|
* @see https://stackoverflow.com/a/776523
|
|
*/
|
|
#include "ruby/3/config.h"
|
|
#include <limits.h> /* for CHAR_BITS */
|
|
#include <stdint.h> /* for uintptr_t */
|
|
#include "internal/compilers.h" /* for MSC_VERSION_SINCE */
|
|
|
|
#if MSC_VERSION_SINCE(1310)
|
|
# include <stdlib.h> /* for _byteswap_uint64 */
|
|
#endif
|
|
|
|
#if defined(HAVE_X86INTRIN_H) && ! defined(MJIT_HEADER)
|
|
# /* Rule out MJIT_HEADER, which does not interface well with <immintrin.h> */
|
|
# include <x86intrin.h> /* for _lzcnt_u64 */
|
|
#elif MSC_VERSION_SINCE(1310)
|
|
# include <intrin.h> /* for the following intrinsics */
|
|
#endif
|
|
|
|
#if defined(_MSC_VER) && defined(__AVX__)
|
|
# pragma intrinsic(__popcnt)
|
|
# pragma intrinsic(__popcnt64)
|
|
#endif
|
|
|
|
#if defined(_MSC_VER) && defined(__AVX2__)
|
|
# pragma intrinsic(__lzcnt)
|
|
# pragma intrinsic(__lzcnt64)
|
|
#endif
|
|
|
|
#if MSC_VERSION_SINCE(1310)
|
|
# pragma intrinsic(_rotl)
|
|
# pragma intrinsic(_rotr)
|
|
# ifdef _WIN64
|
|
# pragma intrinsic(_rotl64)
|
|
# pragma intrinsic(_rotr64)
|
|
# endif
|
|
#endif
|
|
|
|
#if MSC_VERSION_SINCE(1400)
|
|
# pragma intrinsic(_BitScanForward)
|
|
# pragma intrinsic(_BitScanReverse)
|
|
# ifdef _WIN64
|
|
# pragma intrinsic(_BitScanForward64)
|
|
# pragma intrinsic(_BitScanReverse64)
|
|
# endif
|
|
#endif
|
|
|
|
#include "ruby/ruby.h" /* for VALUE */
|
|
#include "internal/static_assert.h" /* for STATIC_ASSERT */
|
|
|
|
/* The most significant bit of the lower part of half-long integer.
|
|
* If sizeof(long) == 4, this is 0x8000.
|
|
* If sizeof(long) == 8, this is 0x80000000.
|
|
*/
|
|
#define HALF_LONG_MSB ((SIGNED_VALUE)1<<((SIZEOF_LONG*CHAR_BIT-1)/2))
|
|
|
|
#define SIGNED_INTEGER_TYPE_P(T) (0 > ((T)0)-1)
|
|
|
|
#define SIGNED_INTEGER_MIN(T) \
|
|
((sizeof(T) == sizeof(int8_t)) ? ((T)INT8_MIN) : \
|
|
((sizeof(T) == sizeof(int16_t)) ? ((T)INT16_MIN) : \
|
|
((sizeof(T) == sizeof(int32_t)) ? ((T)INT32_MIN) : \
|
|
((sizeof(T) == sizeof(int64_t)) ? ((T)INT64_MIN) : \
|
|
0))))
|
|
|
|
#define SIGNED_INTEGER_MAX(T) ((T)(SIGNED_INTEGER_MIN(T) ^ ((T)~(T)0)))
|
|
|
|
#define UNSIGNED_INTEGER_MAX(T) ((T)~(T)0)
|
|
|
|
#if __has_builtin(__builtin_mul_overflow_p)
|
|
# define MUL_OVERFLOW_P(a, b) \
|
|
__builtin_mul_overflow_p((a), (b), (__typeof__(a * b))0)
|
|
#elif __has_builtin(__builtin_mul_overflow)
|
|
# define MUL_OVERFLOW_P(a, b) \
|
|
__extension__ ({ __typeof__(a) c; __builtin_mul_overflow((a), (b), &c); })
|
|
#endif
|
|
|
|
#define MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, min, max) ( \
|
|
(a) == 0 ? 0 : \
|
|
(a) == -1 ? (b) < -(max) : \
|
|
(a) > 0 ? \
|
|
((b) > 0 ? (max) / (a) < (b) : (min) / (a) > (b)) : \
|
|
((b) > 0 ? (min) / (a) < (b) : (max) / (a) > (b)))
|
|
|
|
#if __has_builtin(__builtin_mul_overflow_p)
|
|
/* __builtin_mul_overflow_p can take bitfield */
|
|
/* and GCC permits bitfields for integers other than int */
|
|
# define MUL_OVERFLOW_FIXNUM_P(a, b) \
|
|
__extension__ ({ \
|
|
struct { long fixnum : sizeof(long) * CHAR_BIT - 1; } c = { 0 }; \
|
|
__builtin_mul_overflow_p((a), (b), c.fixnum); \
|
|
})
|
|
#else
|
|
# define MUL_OVERFLOW_FIXNUM_P(a, b) \
|
|
MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, FIXNUM_MIN, FIXNUM_MAX)
|
|
#endif
|
|
|
|
#ifdef MUL_OVERFLOW_P
|
|
# define MUL_OVERFLOW_LONG_LONG_P(a, b) MUL_OVERFLOW_P(a, b)
|
|
# define MUL_OVERFLOW_LONG_P(a, b) MUL_OVERFLOW_P(a, b)
|
|
# define MUL_OVERFLOW_INT_P(a, b) MUL_OVERFLOW_P(a, b)
|
|
#else
|
|
# define MUL_OVERFLOW_LONG_LONG_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, LLONG_MIN, LLONG_MAX)
|
|
# define MUL_OVERFLOW_LONG_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, LONG_MIN, LONG_MAX)
|
|
# define MUL_OVERFLOW_INT_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, INT_MIN, INT_MAX)
|
|
#endif
|
|
|
|
#ifdef HAVE_UINT128_T
|
|
# define bit_length(x) \
|
|
(unsigned int) \
|
|
(sizeof(x) <= sizeof(int32_t) ? 32 - nlz_int32((uint32_t)(x)) : \
|
|
sizeof(x) <= sizeof(int64_t) ? 64 - nlz_int64((uint64_t)(x)) : \
|
|
128 - nlz_int128((uint128_t)(x)))
|
|
#else
|
|
# define bit_length(x) \
|
|
(unsigned int) \
|
|
(sizeof(x) <= sizeof(int32_t) ? 32 - nlz_int32((uint32_t)(x)) : \
|
|
64 - nlz_int64((uint64_t)(x)))
|
|
#endif
|
|
|
|
#ifndef swap16
|
|
# define swap16 ruby_swap16
|
|
#endif
|
|
|
|
#ifndef swap32
|
|
# define swap32 ruby_swap32
|
|
#endif
|
|
|
|
#ifndef swap64
|
|
# define swap64 ruby_swap64
|
|
#endif
|
|
|
|
static inline uint16_t ruby_swap16(uint16_t);
|
|
static inline uint32_t ruby_swap32(uint32_t);
|
|
static inline uint64_t ruby_swap64(uint64_t);
|
|
static inline unsigned nlz_int(unsigned x);
|
|
static inline unsigned nlz_long(unsigned long x);
|
|
static inline unsigned nlz_long_long(unsigned long long x);
|
|
static inline unsigned nlz_intptr(uintptr_t x);
|
|
static inline unsigned nlz_int32(uint32_t x);
|
|
static inline unsigned nlz_int64(uint64_t x);
|
|
#ifdef HAVE_UINT128_T
|
|
static inline unsigned nlz_int128(uint128_t x);
|
|
#endif
|
|
static inline unsigned rb_popcount32(uint32_t x);
|
|
static inline unsigned rb_popcount64(uint64_t x);
|
|
static inline unsigned rb_popcount_intptr(uintptr_t x);
|
|
static inline int ntz_int32(uint32_t x);
|
|
static inline int ntz_int64(uint64_t x);
|
|
static inline int ntz_intptr(uintptr_t x);
|
|
static inline VALUE RUBY_BIT_ROTL(VALUE, int);
|
|
static inline VALUE RUBY_BIT_ROTR(VALUE, int);
|
|
|
|
static inline uint16_t
|
|
ruby_swap16(uint16_t x)
|
|
{
|
|
#if __has_builtin(__builtin_bswap16)
|
|
return __builtin_bswap16(x);
|
|
|
|
#elif MSC_VERSION_SINCE(1310)
|
|
return _byteswap_ushort(x);
|
|
|
|
#else
|
|
return (x << 8) | (x >> 8);
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline uint32_t
|
|
ruby_swap32(uint32_t x)
|
|
{
|
|
#if __has_builtin(__builtin_bswap32)
|
|
return __builtin_bswap32(x);
|
|
|
|
#elif MSC_VERSION_SINCE(1310)
|
|
return _byteswap_ulong(x);
|
|
|
|
#else
|
|
x = ((x & 0x0000FFFF) << 16) | ((x & 0xFFFF0000) >> 16);
|
|
x = ((x & 0x00FF00FF) << 8) | ((x & 0xFF00FF00) >> 8);
|
|
return x;
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline uint64_t
|
|
ruby_swap64(uint64_t x)
|
|
{
|
|
#if __has_builtin(__builtin_bswap64)
|
|
return __builtin_bswap64(x);
|
|
|
|
#elif MSC_VERSION_SINCE(1310)
|
|
return _byteswap_uint64(x);
|
|
|
|
#else
|
|
x = ((x & 0x00000000FFFFFFFFULL) << 32) | ((x & 0xFFFFFFFF00000000ULL) >> 32);
|
|
x = ((x & 0x0000FFFF0000FFFFULL) << 16) | ((x & 0xFFFF0000FFFF0000ULL) >> 16);
|
|
x = ((x & 0x00FF00FF00FF00FFULL) << 8) | ((x & 0xFF00FF00FF00FF00ULL) >> 8);
|
|
return x;
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int
|
|
nlz_int32(uint32_t x)
|
|
{
|
|
#if defined(_MSC_VER) && defined(__AVX2__)
|
|
/* Note: It seems there is no such thing like __LZCNT__ predefined in MSVC.
|
|
* AMD CPUs have had this instruction for decades (since K10) but for
|
|
* Intel, Haswell is the oldest one. We need to use __AVX2__ for maximum
|
|
* safety. */
|
|
return (unsigned int)__lzcnt(x);
|
|
|
|
#elif defined(__x86_64__) && defined(__LZCNT__) && ! defined(MJIT_HEADER)
|
|
return (unsigned int)_lzcnt_u32(x);
|
|
|
|
#elif MSC_VERSION_SINCE(1400) /* &&! defined(__AVX2__) */
|
|
unsigned long r;
|
|
return _BitScanReverse(&r, x) ? (31 - (int)r) : 32;
|
|
|
|
#elif __has_builtin(__builtin_clz)
|
|
STATIC_ASSERT(sizeof_int, sizeof(int) * CHAR_BIT == 32);
|
|
return x ? (unsigned int)__builtin_clz(x) : 32;
|
|
|
|
#else
|
|
uint32_t y;
|
|
unsigned n = 32;
|
|
y = x >> 16; if (y) {n -= 16; x = y;}
|
|
y = x >> 8; if (y) {n -= 8; x = y;}
|
|
y = x >> 4; if (y) {n -= 4; x = y;}
|
|
y = x >> 2; if (y) {n -= 2; x = y;}
|
|
y = x >> 1; if (y) {return n - 2;}
|
|
return (unsigned int)(n - x);
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int
|
|
nlz_int64(uint64_t x)
|
|
{
|
|
#if defined(_MSC_VER) && defined(__AVX2__)
|
|
return (unsigned int)__lzcnt64(x);
|
|
|
|
#elif defined(__x86_64__) && defined(__LZCNT__) && ! defined(MJIT_HEADER)
|
|
return (unsigned int)_lzcnt_u64(x);
|
|
|
|
#elif defined(_WIN64) && MSC_VERSION_SINCE(1400) /* &&! defined(__AVX2__) */
|
|
unsigned long r;
|
|
return _BitScanReverse64(&r, x) ? (63u - (unsigned int)r) : 64;
|
|
|
|
#elif __has_builtin(__builtin_clzl)
|
|
if (x == 0) {
|
|
return 64;
|
|
}
|
|
else if (sizeof(long) * CHAR_BIT == 64) {
|
|
return (unsigned int)__builtin_clzl((unsigned long)x);
|
|
}
|
|
else if (sizeof(long long) * CHAR_BIT == 64) {
|
|
return (unsigned int)__builtin_clzll((unsigned long long)x);
|
|
}
|
|
else {
|
|
/* :FIXME: Is there a way to make this branch a compile-time error? */
|
|
__builtin_unreachable();
|
|
}
|
|
|
|
#else
|
|
uint64_t y;
|
|
unsigned int n = 64;
|
|
y = x >> 32; if (y) {n -= 32; x = y;}
|
|
y = x >> 16; if (y) {n -= 16; x = y;}
|
|
y = x >> 8; if (y) {n -= 8; x = y;}
|
|
y = x >> 4; if (y) {n -= 4; x = y;}
|
|
y = x >> 2; if (y) {n -= 2; x = y;}
|
|
y = x >> 1; if (y) {return n - 2;}
|
|
return (unsigned int)(n - x);
|
|
|
|
#endif
|
|
}
|
|
|
|
#ifdef HAVE_UINT128_T
|
|
static inline unsigned int
|
|
nlz_int128(uint128_t x)
|
|
{
|
|
uint64_t y = (uint64_t)(x >> 64);
|
|
|
|
if (x == 0) {
|
|
return 128;
|
|
}
|
|
else if (y == 0) {
|
|
return (unsigned int)nlz_int64(x) + 64;
|
|
}
|
|
else {
|
|
return (unsigned int)nlz_int64(y);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static inline unsigned int
|
|
nlz_int(unsigned int x)
|
|
{
|
|
if (sizeof(unsigned int) * CHAR_BIT == 32) {
|
|
return nlz_int32((uint32_t)x);
|
|
}
|
|
else if (sizeof(unsigned int) * CHAR_BIT == 64) {
|
|
return nlz_int64((uint64_t)x);
|
|
}
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline unsigned int
|
|
nlz_long(unsigned long x)
|
|
{
|
|
if (sizeof(unsigned long) * CHAR_BIT == 32) {
|
|
return nlz_int32((uint32_t)x);
|
|
}
|
|
else if (sizeof(unsigned long) * CHAR_BIT == 64) {
|
|
return nlz_int64((uint64_t)x);
|
|
}
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline unsigned int
|
|
nlz_long_long(unsigned long long x)
|
|
{
|
|
if (sizeof(unsigned long long) * CHAR_BIT == 64) {
|
|
return nlz_int64((uint64_t)x);
|
|
}
|
|
#ifdef HAVE_UINT128_T
|
|
else if (sizeof(unsigned long long) * CHAR_BIT == 128) {
|
|
return nlz_int128((uint128_t)x);
|
|
}
|
|
#endif
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline unsigned int
|
|
nlz_intptr(uintptr_t x)
|
|
{
|
|
if (sizeof(uintptr_t) == sizeof(unsigned int)) {
|
|
return nlz_int((unsigned int)x);
|
|
}
|
|
if (sizeof(uintptr_t) == sizeof(unsigned long)) {
|
|
return nlz_long((unsigned long)x);
|
|
}
|
|
if (sizeof(uintptr_t) == sizeof(unsigned long long)) {
|
|
return nlz_long_long((unsigned long long)x);
|
|
}
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline unsigned int
|
|
rb_popcount32(uint32_t x)
|
|
{
|
|
#if defined(_MSC_VER) && defined(__AVX__)
|
|
/* Note: CPUs since Nehalem and Barcelona have had this instruction so SSE
|
|
* 4.2 should suffice, but it seems there is no such thing like __SSE_4_2__
|
|
* predefined macro in MSVC. They do have __AVX__ so use it instead. */
|
|
return (unsigned int)__popcnt(x);
|
|
|
|
#elif __has_builtin(__builtin_popcount)
|
|
STATIC_ASSERT(sizeof_int, sizeof(int) * CHAR_BIT >= 32);
|
|
return (unsigned int)__builtin_popcount(x);
|
|
|
|
#else
|
|
x = (x & 0x55555555) + (x >> 1 & 0x55555555);
|
|
x = (x & 0x33333333) + (x >> 2 & 0x33333333);
|
|
x = (x & 0x0f0f0f0f) + (x >> 4 & 0x0f0f0f0f);
|
|
x = (x & 0x001f001f) + (x >> 8 & 0x001f001f);
|
|
x = (x & 0x0000003f) + (x >>16 & 0x0000003f);
|
|
return (unsigned int)x;
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int
|
|
rb_popcount64(uint64_t x)
|
|
{
|
|
#if defined(_MSC_VER) && defined(__AVX__)
|
|
return (unsigned int)__popcnt64(x);
|
|
|
|
#elif __has_builtin(__builtin_popcount)
|
|
if (sizeof(long) * CHAR_BIT == 64) {
|
|
return (unsigned int)__builtin_popcountl((unsigned long)x);
|
|
}
|
|
else if (sizeof(long long) * CHAR_BIT == 64) {
|
|
return (unsigned int)__builtin_popcountll((unsigned long long)x);
|
|
}
|
|
else {
|
|
/* :FIXME: Is there a way to make this branch a compile-time error? */
|
|
__builtin_unreachable();
|
|
}
|
|
|
|
#else
|
|
x = (x & 0x5555555555555555) + (x >> 1 & 0x5555555555555555);
|
|
x = (x & 0x3333333333333333) + (x >> 2 & 0x3333333333333333);
|
|
x = (x & 0x0707070707070707) + (x >> 4 & 0x0707070707070707);
|
|
x = (x & 0x001f001f001f001f) + (x >> 8 & 0x001f001f001f001f);
|
|
x = (x & 0x0000003f0000003f) + (x >>16 & 0x0000003f0000003f);
|
|
x = (x & 0x000000000000007f) + (x >>32 & 0x000000000000007f);
|
|
return (unsigned int)x;
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int
|
|
rb_popcount_intptr(uintptr_t x)
|
|
{
|
|
if (sizeof(uintptr_t) * CHAR_BIT == 64) {
|
|
return rb_popcount64((uint64_t)x);
|
|
}
|
|
else if (sizeof(uintptr_t) * CHAR_BIT == 32) {
|
|
return rb_popcount32((uint32_t)x);
|
|
}
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
ntz_int32(uint32_t x)
|
|
{
|
|
#if defined(__x86_64__) && defined(__BMI__) && ! defined(MJIT_HEADER)
|
|
return (unsigned)_tzcnt_u32(x);
|
|
|
|
#elif MSC_VERSION_SINCE(1400)
|
|
/* :FIXME: Is there any way to issue TZCNT instead of BSF, apart from using
|
|
* assembly? Because issueing LZCNT seems possible (see nlz.h). */
|
|
unsigned long r;
|
|
return _BitScanForward(&r, x) ? (int)r : 32;
|
|
|
|
#elif __has_builtin(__builtin_ctz)
|
|
STATIC_ASSERT(sizeof_int, sizeof(int) * CHAR_BIT == 32);
|
|
return x ? (unsigned)__builtin_ctz(x) : 32;
|
|
|
|
#else
|
|
return rb_popcount32((~x) & (x-1));
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline int
|
|
ntz_int64(uint64_t x)
|
|
{
|
|
#if defined(__x86_64__) && defined(__BMI__) && ! defined(MJIT_HEADER)
|
|
return (unsigned)_tzcnt_u64(x);
|
|
|
|
#elif defined(_WIN64) && MSC_VERSION_SINCE(1400)
|
|
unsigned long r;
|
|
return _BitScanForward64(&r, x) ? (int)r : 64;
|
|
|
|
#elif __has_builtin(__builtin_ctzl)
|
|
if (x == 0) {
|
|
return 64;
|
|
}
|
|
else if (sizeof(long) * CHAR_BIT == 64) {
|
|
return (unsigned)__builtin_ctzl((unsigned long)x);
|
|
}
|
|
else if (sizeof(long long) * CHAR_BIT == 64) {
|
|
return (unsigned)__builtin_ctzll((unsigned long long)x);
|
|
}
|
|
else {
|
|
/* :FIXME: Is there a way to make this branch a compile-time error? */
|
|
__builtin_unreachable();
|
|
}
|
|
|
|
#else
|
|
return rb_popcount64((~x) & (x-1));
|
|
|
|
#endif
|
|
}
|
|
|
|
static inline int
|
|
ntz_intptr(uintptr_t x)
|
|
{
|
|
if (sizeof(uintptr_t) * CHAR_BIT == 64) {
|
|
return ntz_int64((uint64_t)x);
|
|
}
|
|
else if (sizeof(uintptr_t) * CHAR_BIT == 32) {
|
|
return ntz_int32((uint32_t)x);
|
|
}
|
|
else {
|
|
UNREACHABLE_RETURN(~0);
|
|
}
|
|
}
|
|
|
|
static inline VALUE
|
|
RUBY_BIT_ROTL(VALUE v, int n)
|
|
{
|
|
#if __has_builtin(__builtin_rotateleft32) && (SIZEOF_VALUE * CHAR_BIT == 32)
|
|
return __builtin_rotateleft32(v, n);
|
|
|
|
#elif __has_builtin(__builtin_rotateleft64) && (SIZEOF_VALUE * CHAR_BIT == 64)
|
|
return __builtin_rotateleft64(v, n);
|
|
|
|
#elif MSC_VERSION_SINCE(1310) && (SIZEOF_VALUE * CHAR_BIT == 32)
|
|
return _rotl(v, n);
|
|
|
|
#elif MSC_VERSION_SINCE(1310) && (SIZEOF_VALUE * CHAR_BIT == 64)
|
|
return _rotl64(v, n);
|
|
|
|
#elif defined(_lrotl) && (SIZEOF_VALUE == SIZEOF_LONG)
|
|
return _lrotl(v, n);
|
|
|
|
#else
|
|
const int m = (sizeof(VALUE) * CHAR_BIT) - 1;
|
|
return (v << (n & m)) | (v >> (-n & m));
|
|
#endif
|
|
}
|
|
|
|
static inline VALUE
|
|
RUBY_BIT_ROTR(VALUE v, int n)
|
|
{
|
|
#if __has_builtin(__builtin_rotateright32) && (SIZEOF_VALUE * CHAR_BIT == 32)
|
|
return __builtin_rotateright32(v, n);
|
|
|
|
#elif __has_builtin(__builtin_rotateright64) && (SIZEOF_VALUE * CHAR_BIT == 64)
|
|
return __builtin_rotateright64(v, n);
|
|
|
|
#elif MSC_VERSION_SINCE(1310) && (SIZEOF_VALUE * CHAR_BIT == 32)
|
|
return _rotr(v, n);
|
|
|
|
#elif MSC_VERSION_SINCE(1310) && (SIZEOF_VALUE * CHAR_BIT == 64)
|
|
return _rotr64(v, n);
|
|
|
|
#elif defined(_lrotr) && (SIZEOF_VALUE == SIZEOF_LONG)
|
|
return _lrotr(v, n);
|
|
|
|
#else
|
|
const int m = (sizeof(VALUE) * CHAR_BIT) - 1;
|
|
return (v << (-n & m)) | (v >> (n & m));
|
|
#endif
|
|
}
|
|
|
|
#endif /* INTERNAL_BITS_H */
|