forked from OSchip/llvm-project
116 lines
4.3 KiB
C++
116 lines
4.3 KiB
C++
// -*- C++ -*-
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//===----------------------- support/win32/support.h ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_SUPPORT_WIN32_SUPPORT_H
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#define _LIBCPP_SUPPORT_WIN32_SUPPORT_H
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/*
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Functions and constants used in libc++ that are missing from the Windows C library.
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*/
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#include <__config>
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#include <wchar.h> // mbstate_t
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#include <stdio.h> // _snwprintf
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#define swprintf _snwprintf
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#define vswprintf _vsnwprintf
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#define vfscnaf fscanf
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int vasprintf( char **sptr, const char *__restrict fmt , va_list ap );
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int asprintf( char **sptr, const char *__restrict fmt, ...);
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//int vfscanf( FILE *__restrict stream, const char *__restrict format,
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// va_list arg);
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size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src,
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size_t nmc, size_t len, mbstate_t *__restrict ps );
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size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src,
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size_t nwc, size_t len, mbstate_t *__restrict ps );
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#if defined(_MSC_VER)
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#define snprintf _snprintf
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#include <xlocinfo.h>
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#define atoll _atoi64
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#define strtoll _strtoi64
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#define strtoull _strtoui64
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#define wcstoll _wcstoi64
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#define wcstoull _wcstoui64
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_LIBCPP_ALWAYS_INLINE float strtof( const char *nptr, char **endptr )
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{ return _Stof(nptr, endptr, 0); }
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_LIBCPP_ALWAYS_INLINE double strtod( const char *nptr, char **endptr )
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{ return _Stod(nptr, endptr, 0); }
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_LIBCPP_ALWAYS_INLINE long double strtold( const char *nptr, char **endptr )
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{ return _Stold(nptr, endptr, 0); }
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#define _Exit _exit
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#ifndef __clang__ // MSVC-based Clang also defines _MSC_VER
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#include <intrin.h>
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_LIBCPP_ALWAYS_INLINE int __builtin_popcount(unsigned int x) {
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static const unsigned int m1 = 0x55555555; //binary: 0101...
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static const unsigned int m2 = 0x33333333; //binary: 00110011..
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static const unsigned int m4 = 0x0f0f0f0f; //binary: 4 zeros, 4 ones ...
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static const unsigned int h01= 0x01010101; //the sum of 256 to the power of 0,1,2,3...
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x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits
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x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits
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x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits
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return (x * h01) >> 24; //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24)
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}
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_LIBCPP_ALWAYS_INLINE int __builtin_popcountl(unsigned long x) {
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return __builtin_popcount(static_cast<int>(x));
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}
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_LIBCPP_ALWAYS_INLINE int __builtin_popcountll(unsigned long long x) {
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static const unsigned long long m1 = 0x5555555555555555; //binary: 0101...
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static const unsigned long long m2 = 0x3333333333333333; //binary: 00110011..
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static const unsigned long long m4 = 0x0f0f0f0f0f0f0f0f; //binary: 4 zeros, 4 ones ...
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static const unsigned long long h01 = 0x0101010101010101; //the sum of 256 to the power of 0,1,2,3...
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x -= (x >> 1) & m1; //put count of each 2 bits into those 2 bits
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x = (x & m2) + ((x >> 2) & m2); //put count of each 4 bits into those 4 bits
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x = (x + (x >> 4)) & m4; //put count of each 8 bits into those 8 bits
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return static_cast<int>((x * h01)>>56); //returns left 8 bits of x + (x<<8) + (x<<16) + (x<<24) + ...
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}
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_LIBCPP_ALWAYS_INLINE int __builtin_ctz( unsigned int x )
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{
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DWORD r = 0;
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_BitScanReverse(&r, x);
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return static_cast<int>(r);
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}
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// sizeof(long) == sizeof(int) on Windows
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_LIBCPP_ALWAYS_INLINE int __builtin_ctzl( unsigned long x )
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{ return __builtin_ctz( static_cast<int>(x) ); }
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_LIBCPP_ALWAYS_INLINE int __builtin_ctzll( unsigned long long x )
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{
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DWORD r = 0;
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_BitScanReverse64(&r, x);
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return static_cast<int>(r);
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}
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_LIBCPP_ALWAYS_INLINE int __builtin_clz( unsigned int x )
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{
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DWORD r = 0;
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_BitScanForward(&r, x);
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return static_cast<int>(r);
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}
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// sizeof(long) == sizeof(int) on Windows
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_LIBCPP_ALWAYS_INLINE int __builtin_clzl( unsigned long x )
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{ return __builtin_clz( static_cast<int>(x) ); }
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_LIBCPP_ALWAYS_INLINE int __builtin_clzll( unsigned long long x )
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{
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DWORD r = 0;
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_BitScanForward64(&r, x);
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return static_cast<int>(r);
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}
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#endif // !__clang__
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#endif // _MSC_VER
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#endif // _LIBCPP_SUPPORT_WIN32_SUPPORT_H
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