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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __INCLUDE_RTE_SCHED_COMMON_H__
#define __INCLUDE_RTE_SCHED_COMMON_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/types.h>
#define __rte_aligned_16 __attribute__((__aligned__(16)))
static inline uint32_t
rte_sched_min_val_2_u32(uint32_t x, uint32_t y)
{
return (x < y)? x : y;
}
#if 0
static inline uint32_t
rte_min_pos_4_u16(uint16_t *x)
{
uint32_t pos0, pos1;
pos0 = (x[0] <= x[1])? 0 : 1;
pos1 = (x[2] <= x[3])? 2 : 3;
return (x[pos0] <= x[pos1])? pos0 : pos1;
}
#else
/* simplified version to remove branches with CMOV instruction */
static inline uint32_t
rte_min_pos_4_u16(uint16_t *x)
{
uint32_t pos0 = 0;
uint32_t pos1 = 2;
if (x[1] <= x[0]) pos0 = 1;
if (x[3] <= x[2]) pos1 = 3;
if (x[pos1] <= x[pos0]) pos0 = pos1;
return pos0;
}
#endif
/*
* Compute the Greatest Common Divisor (GCD) of two numbers.
* This implementation uses Euclid's algorithm:
* gcd(a, 0) = a
* gcd(a, b) = gcd(b, a mod b)
*
*/
static inline uint32_t
rte_get_gcd(uint32_t a, uint32_t b)
{
uint32_t c;
if (a == 0)
return b;
if (b == 0)
return a;
if (a < b) {
c = a;
a = b;
b = c;
}
while (b != 0) {
c = a % b;
a = b;
b = c;
}
return a;
}
/*
* Compute the Lowest Common Denominator (LCD) of two numbers.
* This implementation computes GCD first:
* LCD(a, b) = (a * b) / GCD(a, b)
*
*/
static inline uint32_t
rte_get_lcd(uint32_t a, uint32_t b)
{
return (a * b) / rte_get_gcd(a, b);
}
#ifdef __cplusplus
}
#endif
#endif /* __INCLUDE_RTE_SCHED_COMMON_H__ */
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