Last change
on this file since 352 was 352, checked in by coas-nagasima, 6 years ago |
arm向けASP3版ECNLを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
542 bytes
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Rev | Line | |
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[352] | 1 | #include "libm.h"
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| 2 |
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| 3 | float modff(float x, float *iptr)
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| 4 | {
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| 5 | union {float f; uint32_t i;} u = {x};
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| 6 | uint32_t mask;
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| 7 | int e = (int)(u.i>>23 & 0xff) - 0x7f;
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| 8 |
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| 9 | /* no fractional part */
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| 10 | if (e >= 23) {
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| 11 | *iptr = x;
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| 12 | if (e == 0x80 && u.i<<9 != 0) { /* nan */
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| 13 | return x;
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| 14 | }
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| 15 | u.i &= 0x80000000;
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| 16 | return u.f;
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| 17 | }
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| 18 | /* no integral part */
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| 19 | if (e < 0) {
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| 20 | u.i &= 0x80000000;
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| 21 | *iptr = u.f;
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| 22 | return x;
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| 23 | }
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| 24 |
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| 25 | mask = 0x007fffff>>e;
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| 26 | if ((u.i & mask) == 0) {
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| 27 | *iptr = x;
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| 28 | u.i &= 0x80000000;
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| 29 | return u.f;
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| 30 | }
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| 31 | u.i &= ~mask;
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| 32 | *iptr = u.f;
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| 33 | return x - u.f;
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| 34 | }
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