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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
#pragma once
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#include <cstdint>
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#include <immintrin.h>
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#include <emmintrin.h>
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#define IS_LE_MACHINE 1
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#define IS_BE_MACHINE 0
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#ifdef _MSC_VER
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#include <intrin.h>
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#else
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#include <x86intrin.h>
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#endif
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#ifdef _MSC_VER
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#define ASSUME(cond) __assume(cond)
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#define LIKELY(cond) (cond)
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#define UNLIKELY(cond) (cond)
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#else
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#define ASSUME(cond) do { if (!(cond)) __builtin_unreachable(); } while (0)
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#define LIKELY(cond) __builtin_expect(!!(cond), 1)
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#define UNLIKELY(cond) __builtin_expect(!!(cond), 0)
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#endif
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// Some platforms don't support thread_local well yet.
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#ifndef _MSC_VER
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#define thread_local __thread
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#endif
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#ifdef _MSC_VER
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#define never_inline __declspec(noinline)
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#else
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#define never_inline __attribute__((noinline))
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#endif
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#ifdef _MSC_VER
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#define force_inline __forceinline
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#else
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#define force_inline __attribute__((always_inline)) inline
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#endif
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#if defined(__GNUG__)
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#include <stdlib.h>
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#define _fpclass(x) std::fpclassify(x)
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#define INFINITE 0xFFFFFFFF
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#ifdef __APPLE__
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// XXX only supports a single timer
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#define TIMER_ABSTIME -1
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/* The opengroup spec isn't clear on the mapping from REALTIME to CALENDAR
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being appropriate or not.
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http://pubs.opengroup.org/onlinepubs/009695299/basedefs/time.h.html */
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#define CLOCK_REALTIME 1 // #define CALENDAR_CLOCK 1 from mach/clock_types.h
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#define CLOCK_MONOTONIC 0 // #define SYSTEM_CLOCK 0
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typedef int clockid_t;
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/* the mach kernel uses struct mach_timespec, so struct timespec
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is loaded from <sys/_types/_timespec.h> for compatability */
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// struct timespec { time_t tv_sec; long tv_nsec; };
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int clock_gettime(clockid_t clk_id, struct timespec *tp);
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#endif /* __APPLE__ */
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#endif /* __GNUG__ */
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inline std::uint32_t cntlz32(std::uint32_t arg)
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{
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#if defined(_MSC_VER)
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unsigned long res;
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return _BitScanReverse(&res, arg) ? res ^ 31 : 32;
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#else
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return arg ? __builtin_clzll(arg) - 32 : 32;
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#endif
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}
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inline std::uint64_t cntlz64(std::uint64_t arg)
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{
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#if defined(_MSC_VER)
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unsigned long res;
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return _BitScanReverse64(&res, arg) ? res ^ 63 : 64;
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#else
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return arg ? __builtin_clzll(arg) : 64;
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#endif
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}
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// Helper function, used by ""_u16, ""_u32, ""_u64
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constexpr std::uint8_t to_u8(char c)
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{
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return static_cast<std::uint8_t>(c);
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}
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// Convert 2-byte string to u16 value like reinterpret_cast does
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constexpr std::uint16_t operator""_u16(const char* s, std::size_t length)
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{
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return length != 2 ? throw s :
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#if IS_LE_MACHINE == 1
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to_u8(s[1]) << 8 | to_u8(s[0]);
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#endif
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}
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// Convert 4-byte string to u32 value like reinterpret_cast does
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constexpr std::uint32_t operator""_u32(const char* s, std::size_t length)
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{
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return length != 4 ? throw s :
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#if IS_LE_MACHINE == 1
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to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
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#endif
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}
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// Convert 8-byte string to u64 value like reinterpret_cast does
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constexpr std::uint64_t operator""_u64(const char* s, std::size_t length)
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{
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return length != 8 ? throw s :
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#if IS_LE_MACHINE == 1
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static_cast<std::uint64_t>(to_u8(s[7]) << 24 | to_u8(s[6]) << 16 | to_u8(s[5]) << 8 | to_u8(s[4])) << 32 | to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
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#endif
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}
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