cscg24-guacamole

CSCG 2024 Challenge 'Guacamole Mashup'
git clone https://git.sinitax.com/sinitax/cscg24-guacamole
Log | Files | Refs | sfeed.txt

intrin.h (1857B)

      1/**
      2 * WinPR: Windows Portable Runtime
      3 * C Run-Time Library Routines
      4 *
      5 * Copyright 2015 Thincast Technologies GmbH
      6 * Copyright 2015 Bernhard Miklautz <bernhard.miklautz@thincast.com>
      7 *
      8 *
      9 * Licensed under the Apache License, Version 2.0 (the "License");
     10 * you may not use this file except in compliance with the License.
     11 * You may obtain a copy of the License at
     12 *
     13 *     http://www.apache.org/licenses/LICENSE-2.0
     14 *
     15 * Unless required by applicable law or agreed to in writing, software
     16 * distributed under the License is distributed on an "AS IS" BASIS,
     17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     18 * See the License for the specific language governing permissions and
     19 * limitations under the License.
     20 */
     21
     22#ifndef WINPR_INTRIN_H
     23#define WINPR_INTRIN_H
     24
     25#ifndef _WIN32
     26
     27/**
     28 * __lzcnt16, __lzcnt, __lzcnt64:
     29 * http://msdn.microsoft.com/en-us/library/bb384809/
     30 *
     31 * Beware: the result of __builtin_clz(0) is undefined
     32 */
     33
     34#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
     35
     36static INLINE UINT32 __lzcnt(UINT32 _val32)
     37{
     38	return ((UINT32)__builtin_clz(_val32));
     39}
     40
     41static INLINE UINT16 __lzcnt16(UINT16 _val16)
     42{
     43	return ((UINT16)(__builtin_clz((UINT32)_val16) - 16));
     44}
     45
     46#else /* (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2) */
     47
     48static INLINE UINT32 __lzcnt(UINT32 x)
     49{
     50	unsigned y;
     51	int n = 32;
     52	y = x >> 16;
     53	if (y != 0)
     54	{
     55		n = n - 16;
     56		x = y;
     57	}
     58	y = x >> 8;
     59	if (y != 0)
     60	{
     61		n = n - 8;
     62		x = y;
     63	}
     64	y = x >> 4;
     65	if (y != 0)
     66	{
     67		n = n - 4;
     68		x = y;
     69	}
     70	y = x >> 2;
     71	if (y != 0)
     72	{
     73		n = n - 2;
     74		x = y;
     75	}
     76	y = x >> 1;
     77	if (y != 0)
     78		return n - 2;
     79	return n - x;
     80}
     81
     82static INLINE UINT16 __lzcnt16(UINT16 x)
     83{
     84	return ((UINT16)__lzcnt((UINT32)x));
     85}
     86
     87#endif /* (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2) */
     88
     89#endif /* _WIN32 */
     90#endif /* WINPR_INTRIN_H */