60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
#pragma once
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#include <cassert>
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef signed char s8;
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typedef signed short s16;
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typedef signed int s32;
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typedef signed long long s64;
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#ifdef _MSC_VER
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/* Microsoft C/C++-compatible compiler */
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#include <intrin.h>
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#else
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#include <immintrin.h>
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#include <x86intrin.h>
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#endif
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typedef __m128i m128;
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typedef __m256i m256;
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// Align to N-byte boundary
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#define ROUNDUP_N(a, n) (((a) + ((n)-1)) & ~((n)-1))
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#define ROUNDDOWN_N(a, n) ((a) & ~((n)-1))
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#define ISALIGNED_N(ptr, n) (((uintptr_t)(ptr) & ((n)-1)) == 0)
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#define really_inline inline __attribute__((always_inline, unused))
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#define never_inline inline __attribute__((noinline, unused))
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#define UNUSED __attribute__((unused))
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#ifndef likely
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#define likely(x) __builtin_expect(!!(x), 1)
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#endif
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#ifndef unlikely
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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static inline u32 ctz64(u64 x) {
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assert(x); // behaviour not defined for x == 0
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#if defined(_WIN64)
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unsigned long r;
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_BitScanForward64(&r, x);
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return r;
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#elif defined(_WIN32)
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unsigned long r;
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if (_BitScanForward(&r, (u32)x)) {
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return (u32)r;
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}
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_BitScanForward(&r, x >> 32);
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return (u32)(r + 32);
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#else
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return (u32)__builtin_ctzll(x);
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#endif
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}
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