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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
#define VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
#include "vpx_ports/msvc.h"
#ifdef _MSC_VER
# include <math.h> // the ceil() definition must precede intrin.h
# if _MSC_VER > 1310 && (defined(_M_X64) || defined(_M_IX86))
# include <intrin.h>
# define USE_MSC_INTRINSICS
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include "./vpx_config.h"
#if ARCH_X86 || ARCH_X86_64
void vpx_reset_mmx_state(void);
#define vp9_clear_system_state() vpx_reset_mmx_state()
#else
#define vp9_clear_system_state()
#endif
#if defined(_MSC_VER) && _MSC_VER < 1800
// round is not defined in MSVC before VS2013.
static INLINE int round(double x) {
if (x < 0)
return (int)ceil(x - 0.5);
else
return (int)floor(x + 0.5);
}
#endif
// use GNU builtins where available.
#if defined(__GNUC__) && \
((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
static INLINE int get_msb(unsigned int n) {
return 31 ^ __builtin_clz(n);
}
#elif defined(USE_MSC_INTRINSICS)
#pragma intrinsic(_BitScanReverse)
static INLINE int get_msb(unsigned int n) {
unsigned long first_set_bit;
_BitScanReverse(&first_set_bit, n);
return first_set_bit;
}
#undef USE_MSC_INTRINSICS
#else
// Returns (int)floor(log2(n)). n must be > 0.
static INLINE int get_msb(unsigned int n) {
int log = 0;
unsigned int value = n;
int i;
for (i = 4; i >= 0; --i) {
const int shift = (1 << i);
const unsigned int x = value >> shift;
if (x != 0) {
value = x;
log += shift;
}
}
return log;
}
#endif
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VP9_COMMON_VP9_SYSTEMDEPENDENT_H_
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