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:
589 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 FLT_EVAL_METHOD==0
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| 4 | #define EPS FLT_EPSILON
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| 5 | #elif FLT_EVAL_METHOD==1
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| 6 | #define EPS DBL_EPSILON
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| 7 | #elif FLT_EVAL_METHOD==2
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| 8 | #define EPS LDBL_EPSILON
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| 9 | #endif
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| 10 | static const float_t toint = 1/EPS;
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| 11 |
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| 12 | float roundf(float x)
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| 13 | {
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| 14 | union {float f; uint32_t i;} u = {x};
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| 15 | int e = u.i >> 23 & 0xff;
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| 16 | float_t y;
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| 17 |
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| 18 | if (e >= 0x7f+23)
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| 19 | return x;
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| 20 | if (u.i >> 31)
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| 21 | x = -x;
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| 22 | if (e < 0x7f-1) {
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| 23 | FORCE_EVAL(x + toint);
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| 24 | return 0*u.f;
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| 25 | }
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| 26 | y = x + toint - toint - x;
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| 27 | if (y > 0.5f)
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| 28 | y = y + x - 1;
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| 29 | else if (y <= -0.5f)
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| 30 | y = y + x + 1;
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| 31 | else
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| 32 | y = y + x;
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| 33 | if (u.i >> 31)
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| 34 | y = -y;
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| 35 | return y;
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| 36 | }
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