38 lines
659 B
C
38 lines
659 B
C
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#include "libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double roundl(long double x)
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{
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return round(x);
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}
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#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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static const long double toint = 1/LDBL_EPSILON;
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long double roundl(long double x)
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{
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union ldshape u = {x};
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int e = u.i.se & 0x7fff;
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long double y;
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if (e >= 0x3fff+LDBL_MANT_DIG-1)
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return x;
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if (u.i.se >> 15)
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x = -x;
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if (e < 0x3fff-1) {
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FORCE_EVAL(x + toint);
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return 0*u.f;
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}
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y = x + toint - toint - x;
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if (y > 0.5)
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y = y + x - 1;
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else if (y <= -0.5)
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y = y + x + 1;
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else
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y = y + x;
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if (u.i.se >> 15)
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y = -y;
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return y;
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}
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#endif
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