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 <cwchar> // mbstate_t 19 #include <cstdarg> // va_ macros 20 #define swprintf _snwprintf 21 #define vswprintf _vsnwprintf 22 23 extern "C" { 24 25 int vasprintf( char **sptr, const char *__restrict fmt, va_list ap ); 26 int asprintf( char **sptr, const char *__restrict fmt, ...); 27 size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src, 28 size_t nmc, size_t len, mbstate_t *__restrict ps ); 29 size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src, 30 size_t nwc, size_t len, mbstate_t *__restrict ps ); 31 } 32 33 #if defined(_MSC_VER) 34 #define snprintf _snprintf 35 #include <xlocinfo.h> 36 #define atoll _atoi64 37 #define strtoll _strtoi64 38 #define strtoull _strtoui64 39 #define wcstoll _wcstoi64 40 #define wcstoull _wcstoui64 41 _LIBCPP_ALWAYS_INLINE float strtof( const char *nptr, char **endptr ) 42 { return _Stof(nptr, endptr, 0); } 43 _LIBCPP_ALWAYS_INLINE double strtod( const char *nptr, char **endptr ) 44 { return _Stod(nptr, endptr, 0); } 45 _LIBCPP_ALWAYS_INLINE long double strtold( const char *nptr, char **endptr ) 46 { return _Stold(nptr, endptr, 0); } 47 48 #define _Exit _exit 49 50 #ifndef __clang__ // MSVC-based Clang also defines _MSC_VER 51 #include <intrin.h> 52 53 _LIBCPP_ALWAYS_INLINE int __builtin_popcount(unsigned int x) { 54 static const unsigned int m1 = 0x55555555; //binary: 0101... 55 static const unsigned int m2 = 0x33333333; //binary: 00110011.. 56 static const unsigned int m4 = 0x0f0f0f0f; //binary: 4 zeros, 4 ones ... 57 static const unsigned int h01= 0x01010101; //the sum of 256 to the power of 0,1,2,3... 58 x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits 59 x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits 60 x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits 61 return (x * h01) >> 24; //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24) 62 } 63 64 _LIBCPP_ALWAYS_INLINE int __builtin_popcountl(unsigned long x) { 65 return __builtin_popcount(static_cast<int>(x)); 66 } 67 68 _LIBCPP_ALWAYS_INLINE int __builtin_popcountll(unsigned long long x) { 69 static const unsigned long long m1 = 0x5555555555555555; //binary: 0101... 70 static const unsigned long long m2 = 0x3333333333333333; //binary: 00110011.. 71 static const unsigned long long m4 = 0x0f0f0f0f0f0f0f0f; //binary: 4 zeros, 4 ones ... 72 static const unsigned long long h01 = 0x0101010101010101; //the sum of 256 to the power of 0,1,2,3... 73 x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits 74 x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits 75 x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits 76 return static_cast<int>((x * h01)>>56); //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24) + ... 77 } 78 79 _LIBCPP_ALWAYS_INLINE int __builtin_ctz( unsigned int x ) 80 { 81 DWORD r = 0; 82 _BitScanReverse(&r, x); 83 return static_cast<int>(r); 84 } 85 86 // sizeof(long) == sizeof(int) on Windows 87 _LIBCPP_ALWAYS_INLINE int __builtin_ctzl( unsigned long x ) 88 { return __builtin_ctz( static_cast<int>(x) ); } 89 90 _LIBCPP_ALWAYS_INLINE int __builtin_ctzll( unsigned long long x ) 91 { 92 DWORD r = 0; 93 _BitScanReverse64(&r, x); 94 return static_cast<int>(r); 95 } 96 _LIBCPP_ALWAYS_INLINE int __builtin_clz( unsigned int x ) 97 { 98 DWORD r = 0; 99 _BitScanForward(&r, x); 100 return static_cast<int>(r); 101 } 102 // sizeof(long) == sizeof(int) on Windows 103 _LIBCPP_ALWAYS_INLINE int __builtin_clzl( unsigned long x ) 104 { return __builtin_clz( static_cast<int>(x) ); } 105 _LIBCPP_ALWAYS_INLINE int __builtin_clzll( unsigned long long x ) 106 { 107 DWORD r = 0; 108 _BitScanForward64(&r, x); 109 return static_cast<int>(r); 110 } 111 #endif // !__clang__ 112 #endif // _MSC_VER 113 114 #endif // _LIBCPP_SUPPORT_WIN32_SUPPORT_H 115
