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Last change
on this file since 543 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
414 bytes
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| Line | |
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| 1 | /* |
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| 2 | * compute 10**x by successive squaring. |
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| 3 | */ |
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| 4 | |
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| 5 | #include <_ansi.h> |
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| 6 | #include "std.h" |
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| 7 | |
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| 8 | double |
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| 9 | __exp10 (unsigned x) |
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| 10 | { |
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| 11 | static const double powtab[] = |
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| 12 | {1.0, |
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| 13 | 10.0, |
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| 14 | 100.0, |
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| 15 | 1000.0, |
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| 16 | 10000.0}; |
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| 17 | |
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| 18 | if (x < (sizeof (powtab) / sizeof (double))) |
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| 19 | return powtab[x]; |
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| 20 | else if (x & 1) |
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| 21 | { |
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| 22 | return 10.0 * __exp10 (x - 1); |
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| 23 | } |
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| 24 | else |
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| 25 | { |
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| 26 | double n = __exp10 (x / 2); |
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| 27 | return n * n; |
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| 28 | } |
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| 29 | } |
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