35 lines
755 B
C
35 lines
755 B
C
#include "libc/math/libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double floorl(long double x)
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{
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return floor(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 floorl(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 || x == 0)
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return x;
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/* y = int(x) - x, where int(x) is an integer neighbor of x */
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if (u.i.se >> 15)
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y = x - toint + toint - x;
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else
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y = x + toint - toint - x;
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/* special case because of non-nearest rounding modes */
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if (e <= 0x3fff-1) {
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FORCE_EVAL(y);
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return u.i.se >> 15 ? -1 : 0;
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}
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if (y > 0)
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return x + y - 1;
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return x + y;
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}
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#endif
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