root / target-ppc / mfrom_table_gen.c @ eaabeef2
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| 1 | 76a66253 | j_mayer | #define _GNU_SOURCE
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| 2 | 76a66253 | j_mayer | #include <stdint.h> |
| 3 | 76a66253 | j_mayer | #include <stdio.h> |
| 4 | 76a66253 | j_mayer | #include <math.h> |
| 5 | 76a66253 | j_mayer | |
| 6 | 76a66253 | j_mayer | int main (void) |
| 7 | 76a66253 | j_mayer | {
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| 8 | 76a66253 | j_mayer | double d;
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| 9 | 76a66253 | j_mayer | uint8_t n; |
| 10 | 76a66253 | j_mayer | int i;
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| 11 | 3b46e624 | ths | |
| 12 | 76a66253 | j_mayer | printf("static const uint8_t mfrom_ROM_table[602] =\n{\n ");
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| 13 | 76a66253 | j_mayer | for (i = 0; i < 602; i++) { |
| 14 | 76a66253 | j_mayer | /* Extremly decomposed:
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| 15 | 76a66253 | j_mayer | * -T0 / 256
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| 16 | 76a66253 | j_mayer | * T0 = 256 * log10(10 + 1.0) + 0.5
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| 17 | 76a66253 | j_mayer | */
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| 18 | 76a66253 | j_mayer | d = -i; |
| 19 | 76a66253 | j_mayer | d /= 256.0; |
| 20 | 76a66253 | j_mayer | d = exp10(d); |
| 21 | 76a66253 | j_mayer | d += 1.0; |
| 22 | 76a66253 | j_mayer | d = log10(d); |
| 23 | 76a66253 | j_mayer | d *= 256;
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| 24 | 76a66253 | j_mayer | d += 0.5; |
| 25 | 76a66253 | j_mayer | n = d; |
| 26 | 76a66253 | j_mayer | printf("%3d, ", n);
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| 27 | 76a66253 | j_mayer | if ((i & 7) == 7) |
| 28 | 76a66253 | j_mayer | printf("\n ");
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| 29 | 76a66253 | j_mayer | } |
| 30 | 76a66253 | j_mayer | printf("\n};\n");
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| 31 | 76a66253 | j_mayer | |
| 32 | 76a66253 | j_mayer | return 0; |
| 33 | 76a66253 | j_mayer | } |