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/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2016 Intel Corporation
*/
#ifndef MESA_V3D_PACKET_HELPERS_H
#define MESA_V3D_PACKET_HELPERS_H
#include <assert.h>
#include <stdint.h>
#include "bitpack_helpers.h"
/*
* Copied from Mesa's u_math.h
*/
union fi {
float f;
int32_t i;
uint32_t ui;
};
static inline float uif(uint32_t ui)
{
union fi fi;
fi.ui = ui;
return fi.f;
}
static inline unsigned int fui(float f)
{
union fi fi;
fi.f = f;
return fi.ui;
}
static inline uint64_t
__gen_unpack_uint(const uint8_t *restrict cl, uint32_t start, uint32_t end)
{
uint64_t val = 0;
const int width = end - start + 1;
const uint32_t mask = (width == 32 ? ~0 : (1 << width) - 1);
for (uint32_t byte = start / 8; byte <= end / 8; byte++)
val |= cl[byte] << ((byte - start / 8) * 8);
return (val >> (start % 8)) & mask;
}
static inline uint64_t
__gen_unpack_sint(const uint8_t *restrict cl, uint32_t start, uint32_t end)
{
int size = end - start + 1;
int64_t val = __gen_unpack_uint(cl, start, end);
/* Get the sign bit extended. */
return (val << (64 - size)) >> (64 - size);
}
static inline float
__gen_unpack_sfixed(const uint8_t *restrict cl, uint32_t start, uint32_t end,
uint32_t fractional_size)
{
int32_t bits = __gen_unpack_sint(cl, start, end);
return (float)bits / (1 << fractional_size);
}
static inline float
__gen_unpack_ufixed(const uint8_t *restrict cl, uint32_t start, uint32_t end,
uint32_t fractional_size)
{
int32_t bits = __gen_unpack_uint(cl, start, end);
return (float)bits / (1 << fractional_size);
}
static inline float
__gen_unpack_float(const uint8_t *restrict cl, uint32_t start, uint32_t end)
{
struct PACKED { float f; } *f;
assert(start % 8 == 0);
assert(end - start == 31);
f = (void *)(cl + (start / 8));
return f->f;
}
static inline float
__gen_unpack_f187(const uint8_t *restrict cl, uint32_t start, uint32_t end)
{
uint32_t bits;
assert(end - start == 15);
bits = __gen_unpack_uint(cl, start, end);
return uif(bits << 16);
}
#endif
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