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/*
* 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 "pvr_types.h"
#include "util/bitscan.h"
#include "util/macros.h"
static inline bool pvr_dev_addr_is_aligned(pvr_dev_addr_t addr,
const uint32_t alignment)
{
assert(util_is_power_of_two_nonzero(alignment));
return ((uintptr_t)(addr.addr) & (alignment - 1)) == 0;
}
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 */
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