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/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2016 Intel Corporation
*/
#ifndef UTIL_BITPACK_HELPERS_H
#define UTIL_BITPACK_HELPERS_H
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#ifndef util_bitpack_validate_value
#define util_bitpack_validate_value(x)
#endif
/** Set a single bit */
#define BITFIELD64_BIT(b) (1ull << (b))
/** Set all bits up to excluding bit b */
#define BITFIELD64_MASK(b) \
((b) == 64 ? (~0ull) : BITFIELD64_BIT(b) - 1)
static inline uint64_t
util_bitpack_uint(uint64_t v, uint32_t start, __attribute__((unused)) uint32_t end)
{
util_bitpack_validate_value(v);
return v << start;
}
static inline uint64_t
util_bitpack_sint(int64_t v, uint32_t start, uint32_t end)
{
const int bits = end - start + 1;
const uint64_t mask = BITFIELD64_MASK(bits);
return (v & mask) << start;
}
static inline uint64_t
util_bitpack_sfixed(float v, uint32_t start, uint32_t end,
uint32_t fract_bits)
{
const float factor = (1 << fract_bits);
const int64_t int_val = llroundf(v * factor);
const uint64_t mask = ~0ull >> (64 - (end - start + 1));
return (int_val & mask) << start;
}
static inline uint64_t
util_bitpack_ufixed(float v, uint32_t start, __attribute__((unused)) uint32_t end,
uint32_t fract_bits)
{
const float factor = (1 << fract_bits);
const uint64_t uint_val = llroundf(v * factor);
return uint_val << start;
}
#endif /* UTIL_BITPACK_HELPERS_H */
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