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| 3 | * Copyright 2023 Advanced Micro Devices, Inc.
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| 4 | *
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| 5 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 6 | * copy of this software and associated documentation files (the "Software"),
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| 7 | * to deal in the Software without restriction, including without limitation
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| 8 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 9 | * and/or sell copies of the Software, and to permit persons to whom the
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| 10 | * Software is furnished to do so, subject to the following conditions:
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| 11 | *
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| 12 | * The above copyright notice and this permission notice shall be included in
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| 13 | * all copies or substantial portions of the Software.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 18 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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| 19 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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| 20 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 21 | * OTHER DEALINGS IN THE SOFTWARE.
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| 22 | *
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| 23 | * Authors: AMD
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| 24 | *
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| 25 |
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| 26 | #include "dm_services.h"
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| 27 | #include "custom_float.h"
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| 28 |
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| 29 | static bool build_custom_float(struct fixed31_32 value,
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| 30 | const struct custom_float_format *format,
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| 31 | bool *negative,
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| 32 | uint32_t *mantissa,
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| 33 | uint32_t *exponenta)
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| 34 | {
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| 35 | uint32_t exp_offset = (1 << (format->exponenta_bits - 1)) - 1;
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| 36 |
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| 37 | const struct fixed31_32 mantissa_constant_plus_max_fraction =
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| 38 | dc_fixpt_from_fraction((1LL << (format->mantissa_bits + 1)) - 1,
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| 39 | 1LL << format->mantissa_bits);
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| 40 |
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| 41 | struct fixed31_32 mantiss;
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| 42 |
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| 43 | if (dc_fixpt_eq(value, dc_fixpt_zero)) {
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| 44 | *negative = false;
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| 45 | *mantissa = 0;
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| 46 | *exponenta = 0;
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| 47 | return true;
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| 48 | }
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| 49 |
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| 50 | if (dc_fixpt_lt(value, dc_fixpt_zero)) {
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| 51 | *negative = format->sign;
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| 52 | value = dc_fixpt_neg(value);
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| 53 | } else {
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| 54 | *negative = false;
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| 55 | }
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| 56 |
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| 57 | if (dc_fixpt_lt(value, dc_fixpt_one)) {
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| 58 | uint32_t i = 1;
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| 59 |
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| 60 | do {
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| 61 | value = dc_fixpt_shl(value, 1);
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| 62 | ++i;
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| 63 | } while (dc_fixpt_lt(value, dc_fixpt_one));
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| 64 |
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| 65 | --i;
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| 66 |
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| 67 | if (exp_offset <= i) {
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| 68 | *mantissa = 0;
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| 69 | *exponenta = 0;
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| 70 | return true;
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| 71 | }
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| 72 |
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| 73 | *exponenta = exp_offset - i;
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| 74 | } else if (dc_fixpt_le(mantissa_constant_plus_max_fraction, value)) {
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| 75 | uint32_t i = 1;
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| 76 |
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| 77 | do {
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| 78 | value = dc_fixpt_shr(value, 1);
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| 79 | ++i;
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| 80 | } while (dc_fixpt_lt(mantissa_constant_plus_max_fraction, value));
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| 81 |
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| 82 | *exponenta = exp_offset + i - 1;
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| 83 | } else {
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| 84 | *exponenta = exp_offset;
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| 85 | }
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| 86 |
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| 87 | mantiss = dc_fixpt_sub(value, dc_fixpt_one);
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| 88 |
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| 89 | if (dc_fixpt_lt(mantiss, dc_fixpt_zero) ||
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| 90 | dc_fixpt_lt(dc_fixpt_one, mantiss))
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| 91 | mantiss = dc_fixpt_zero;
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| 92 | else
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| 93 | mantiss = dc_fixpt_shl(mantiss, (unsigned char)format->mantissa_bits);
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| 94 |
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| 95 | *mantissa = dc_fixpt_floor(mantiss);
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| 96 |
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| 97 | return true;
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| 98 | }
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| 99 |
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| 100 | static bool setup_custom_float(const struct custom_float_format *format,
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| 101 | bool negative,
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| 102 | uint32_t mantissa,
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| 103 | uint32_t exponenta,
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| 104 | uint32_t *result)
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| 105 | {
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| 106 | uint32_t i = 0;
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| 107 | uint32_t j = 0;
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| 108 | uint32_t value = 0;
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| 109 |
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| 110 | |
| 111 | * once calculation is ok we can remove it
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| 112 |
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| 113 |
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| 114 | const uint32_t mantissa_mask =
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| 115 | (1 << (format->mantissa_bits + 1)) - 1;
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| 116 |
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| 117 | const uint32_t exponenta_mask =
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| 118 | (1 << (format->exponenta_bits + 1)) - 1;
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| 119 |
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| 120 | if (mantissa & ~mantissa_mask) {
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| 121 | BREAK_TO_DEBUGGER();
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| 122 | mantissa = mantissa_mask;
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| 123 | }
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| 124 |
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| 125 | if (exponenta & ~exponenta_mask) {
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| 126 | BREAK_TO_DEBUGGER();
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| 127 | exponenta = exponenta_mask;
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| 128 | }
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| 129 |
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| 130 |
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| 131 |
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| 132 | while (i < format->mantissa_bits) {
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| 133 | uint32_t mask = 1 << i;
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| 134 |
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| 135 | if (mantissa & mask)
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| 136 | value |= mask;
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| 137 |
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| 138 | ++i;
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| 139 | }
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| 140 |
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| 141 | while (j < format->exponenta_bits) {
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| 142 | uint32_t mask = 1 << j;
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| 143 |
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| 144 | if (exponenta & mask)
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| 145 | value |= mask << i;
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| 146 |
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| 147 | ++j;
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| 148 | }
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| 149 |
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| 150 | if (negative && format->sign)
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| 151 | value |= 1 << (i + j);
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| 152 |
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| 153 | *result = value;
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| 154 |
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| 155 | return true;
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| 156 | }
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| 157 |
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| 158 | bool convert_to_custom_float_format(struct fixed31_32 value,
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| 159 | const struct custom_float_format *format,
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| 160 | uint32_t *result)
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| 161 | {
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| 162 | uint32_t mantissa;
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| 163 | uint32_t exponenta;
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| 164 | bool negative;
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| 165 |
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| 166 | return build_custom_float(value, format, &negative, &mantissa, &exponenta) &&
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| 167 | setup_custom_float(format,
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| 168 | negative,
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| 169 | mantissa,
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| 170 | exponenta,
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| 171 | result);
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| 172 | }
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| 173 |
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