1 // -*- C++ -*- 2 //===----------------------- support/win32/support.h ----------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_SUPPORT_WIN32_SUPPORT_H 12 #define _LIBCPP_SUPPORT_WIN32_SUPPORT_H 13 14 /* 15 Functions and constants used in libc++ that are missing from the Windows C library. 16 */ 17 18 #include <__config> 19 #include <wchar.h> // mbstate_t 20 #include <stdio.h> // _snwprintf 21 #define swprintf _snwprintf 22 #define vswprintf _vsnwprintf 23 #define vfscnaf fscanf 24 25 int vasprintf( char **sptr, const char *__restrict fmt , va_list ap ); 26 int asprintf( char **sptr, const char *__restrict fmt, ...); 27 //int vfscanf( FILE *__restrict stream, const char *__restrict format, 28 // va_list arg); 29 30 size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src, 31 size_t nmc, size_t len, mbstate_t *__restrict ps ); 32 size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src, 33 size_t nwc, size_t len, mbstate_t *__restrict ps ); 34 35 #if defined(_MSC_VER) 36 #define snprintf _snprintf 37 38 #include <xlocinfo.h> 39 #define atoll _atoi64 40 #define strtoll _strtoi64 41 #define strtoull _strtoui64 42 #define wcstoll _wcstoi64 43 #define wcstoull _wcstoui64 44 _LIBCPP_ALWAYS_INLINE float strtof( const char *nptr, char **endptr ) 45 { return _Stof(nptr, endptr, 0); } 46 _LIBCPP_ALWAYS_INLINE double strtod( const char *nptr, char **endptr ) 47 { return _Stod(nptr, endptr, 0); } 48 _LIBCPP_ALWAYS_INLINE long double strtold( const char *nptr, char **endptr ) 49 { return _Stold(nptr, endptr, 0); } 50 51 #define _Exit _exit 52 53 #ifndef __clang__ // MSVC-based Clang also defines _MSC_VER 54 #include <intrin.h> 55 56 _LIBCPP_ALWAYS_INLINE int __builtin_popcount(unsigned int x) { 57 static const unsigned int m1 = 0x55555555; //binary: 0101... 58 static const unsigned int m2 = 0x33333333; //binary: 00110011.. 59 static const unsigned int m4 = 0x0f0f0f0f; //binary: 4 zeros, 4 ones ... 60 static const unsigned int h01= 0x01010101; //the sum of 256 to the power of 0,1,2,3... 61 x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits 62 x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits 63 x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits 64 return (x * h01) >> 24; //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24) 65 } 66 67 _LIBCPP_ALWAYS_INLINE int __builtin_popcountl(unsigned long x) { 68 return __builtin_popcount(static_cast<int>(x)); 69 } 70 71 _LIBCPP_ALWAYS_INLINE int __builtin_popcountll(unsigned long long x) { 72 static const unsigned long long m1 = 0x5555555555555555; //binary: 0101... 73 static const unsigned long long m2 = 0x3333333333333333; //binary: 00110011.. 74 static const unsigned long long m4 = 0x0f0f0f0f0f0f0f0f; //binary: 4 zeros, 4 ones ... 75 static const unsigned long long h01 = 0x0101010101010101; //the sum of 256 to the power of 0,1,2,3... 76 x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits 77 x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits 78 x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits 79 return static_cast<int>((x * h01)>>56); //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24) + ... 80 } 81 82 _LIBCPP_ALWAYS_INLINE int __builtin_ctz( unsigned int x ) 83 { 84 DWORD r = 0; 85 _BitScanReverse(&r, x); 86 return static_cast<int>(r); 87 } 88 // sizeof(long) == sizeof(int) on Windows 89 _LIBCPP_ALWAYS_INLINE int __builtin_ctzl( unsigned long x ) 90 { return __builtin_ctz( static_cast<int>(x) ); } 91 _LIBCPP_ALWAYS_INLINE int __builtin_ctzll( unsigned long long x ) 92 { 93 DWORD r = 0; 94 _BitScanReverse64(&r, x); 95 return static_cast<int>(r); 96 } 97 _LIBCPP_ALWAYS_INLINE int __builtin_clz( unsigned int x ) 98 { 99 DWORD r = 0; 100 _BitScanForward(&r, x); 101 return static_cast<int>(r); 102 } 103 // sizeof(long) == sizeof(int) on Windows 104 _LIBCPP_ALWAYS_INLINE int __builtin_clzl( unsigned long x ) 105 { return __builtin_clz( static_cast<int>(x) ); } 106 _LIBCPP_ALWAYS_INLINE int __builtin_clzll( unsigned long long x ) 107 { 108 DWORD r = 0; 109 _BitScanForward64(&r, x); 110 return static_cast<int>(r); 111 } 112 #endif // !__clang__ 113 #endif // _MSC_VER 114 115 #endif // _LIBCPP_SUPPORT_WIN32_SUPPORT_H 116
