Last change
on this file since 373 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
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
738 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 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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| 4 | double nexttoward(double x, long double y)
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| 5 | {
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| 6 | return nextafter(x, y);
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| 7 | }
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| 8 | #else
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| 9 | double nexttoward(double x, long double y)
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| 10 | {
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| 11 | union {double f; uint64_t i;} ux = {x};
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| 12 | int e;
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| 13 |
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| 14 | if (isnan(x) || isnan(y))
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| 15 | return x + y;
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| 16 | if (x == y)
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| 17 | return y;
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| 18 | if (x == 0) {
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| 19 | ux.i = 1;
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| 20 | if (signbit(y))
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| 21 | ux.i |= 1ULL<<63;
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| 22 | } else if (x < y) {
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| 23 | if (signbit(x))
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| 24 | ux.i--;
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| 25 | else
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| 26 | ux.i++;
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| 27 | } else {
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| 28 | if (signbit(x))
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| 29 | ux.i++;
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| 30 | else
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| 31 | ux.i--;
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| 32 | }
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| 33 | e = ux.i>>52 & 0x7ff;
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| 34 | /* raise overflow if ux.f is infinite and x is finite */
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| 35 | if (e == 0x7ff)
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| 36 | FORCE_EVAL(x+x);
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| 37 | /* raise underflow if ux.f is subnormal or zero */
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| 38 | if (e == 0)
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| 39 | FORCE_EVAL(x*x + ux.f*ux.f);
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| 40 | return ux.f;
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| 41 | }
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| 42 | #endif
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