mirror of https://gitlab.freedesktop.org/mesa/mesa
102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*
|
|
* Copyright © 2022 Imagination Technologies Ltd.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#ifndef PVR_UTIL_H
|
|
#define PVR_UTIL_H
|
|
|
|
#include <assert.h>
|
|
#include <stdint.h>
|
|
|
|
#include "util/bitscan.h"
|
|
#include "util/macros.h"
|
|
|
|
static inline bool ptr_is_aligned(const void *const ptr,
|
|
const uint32_t alignment)
|
|
{
|
|
assert(util_is_power_of_two_nonzero(alignment));
|
|
return ((uintptr_t)(ptr) & (alignment - 1)) == 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
Math functions
|
|
*****************************************************************************/
|
|
|
|
static inline uint32_t u32_bin_digits(uint32_t x)
|
|
{
|
|
return x == 0 ? 1 : util_last_bit(x);
|
|
}
|
|
|
|
static inline uint32_t u64_bin_digits(uint64_t x)
|
|
{
|
|
return x == 0 ? 1 : util_last_bit64(x);
|
|
}
|
|
|
|
extern const uint8_t est_log10_from_log2[64 + 1];
|
|
extern const uint32_t u32_powers_of_ten[10];
|
|
extern const uint64_t u64_powers_of_ten[20];
|
|
|
|
/*
|
|
* This function includes parts of a public-domain log10 algorithm from
|
|
* "Bit Twiddling Hacks", an aggregate collection which is:
|
|
*
|
|
* © 1997-2005 Sean Eron Anderson.
|
|
*
|
|
* https://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
|
|
*/
|
|
static inline uint32_t u32_dec_digits(uint32_t x)
|
|
{
|
|
/* The value of nr_digits is an estimation of ceil(log10(x)) with variance
|
|
* +0/-1 (as per the comment on the estimation lut).
|
|
*/
|
|
const uint32_t nr_digits = est_log10_from_log2[util_last_bit(x)];
|
|
|
|
/* We then convert this approximation to a real value by adding 1 iff
|
|
* x >= 10**nr_digits using another lut to quickly compute the
|
|
* exponentiation. See the comment on u32_powers_of_ten for details of this.
|
|
*/
|
|
return nr_digits + (x >= u32_powers_of_ten[nr_digits]);
|
|
}
|
|
|
|
/* This function is an extended form of u32_dec_digits(); see the comments on
|
|
* that function for details.
|
|
*/
|
|
static inline uint32_t u64_dec_digits(uint64_t x)
|
|
{
|
|
const uint32_t nr_digits = est_log10_from_log2[util_last_bit64(x)];
|
|
return nr_digits + (x >= u64_powers_of_ten[nr_digits]);
|
|
}
|
|
|
|
static inline uint32_t u32_hex_digits(uint32_t x)
|
|
{
|
|
const uint32_t binary_digits = u32_bin_digits(x);
|
|
return (binary_digits >> 2) + !!(binary_digits & 3);
|
|
}
|
|
|
|
static inline uint32_t u64_hex_digits(uint64_t x)
|
|
{
|
|
const uint32_t binary_digits = u64_bin_digits(x);
|
|
return (binary_digits >> 2) + !!(binary_digits & 3);
|
|
}
|
|
|
|
#endif /* PVR_UTIL_H */
|