Last change
on this file since 387 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:
1.1 KB
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Rev | Line | |
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[352] | 1 | #include <math.h>
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| 2 | #include <stdint.h>
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| 3 |
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| 4 | float fmodf(float x, float y)
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| 5 | {
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| 6 | union {float f; uint32_t i;} ux = {x}, uy = {y};
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| 7 | int ex = ux.i>>23 & 0xff;
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| 8 | int ey = uy.i>>23 & 0xff;
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| 9 | uint32_t sx = ux.i & 0x80000000;
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| 10 | uint32_t i;
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| 11 | uint32_t uxi = ux.i;
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| 12 |
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| 13 | if (uy.i<<1 == 0 || isnan(y) || ex == 0xff)
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| 14 | return (x*y)/(x*y);
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| 15 | if (uxi<<1 <= uy.i<<1) {
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| 16 | if (uxi<<1 == uy.i<<1)
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| 17 | return 0*x;
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| 18 | return x;
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| 19 | }
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| 20 |
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| 21 | /* normalize x and y */
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| 22 | if (!ex) {
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| 23 | for (i = uxi<<9; i>>31 == 0; ex--, i <<= 1);
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| 24 | uxi <<= -ex + 1;
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| 25 | } else {
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| 26 | uxi &= -1U >> 9;
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| 27 | uxi |= 1U << 23;
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| 28 | }
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| 29 | if (!ey) {
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| 30 | for (i = uy.i<<9; i>>31 == 0; ey--, i <<= 1);
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| 31 | uy.i <<= -ey + 1;
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| 32 | } else {
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| 33 | uy.i &= -1U >> 9;
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| 34 | uy.i |= 1U << 23;
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| 35 | }
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| 36 |
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| 37 | /* x mod y */
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| 38 | for (; ex > ey; ex--) {
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| 39 | i = uxi - uy.i;
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| 40 | if (i >> 31 == 0) {
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| 41 | if (i == 0)
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| 42 | return 0*x;
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| 43 | uxi = i;
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| 44 | }
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| 45 | uxi <<= 1;
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| 46 | }
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| 47 | i = uxi - uy.i;
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| 48 | if (i >> 31 == 0) {
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| 49 | if (i == 0)
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| 50 | return 0*x;
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| 51 | uxi = i;
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| 52 | }
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| 53 | for (; uxi>>23 == 0; uxi <<= 1, ex--);
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| 54 |
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| 55 | /* scale result up */
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| 56 | if (ex > 0) {
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| 57 | uxi -= 1U << 23;
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| 58 | uxi |= (uint32_t)ex << 23;
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| 59 | } else {
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| 60 | uxi >>= -ex + 1;
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| 61 | }
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| 62 | uxi |= sx;
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| 63 | ux.i = uxi;
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| 64 | return ux.f;
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| 65 | }
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