81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
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/* s_nearbyintl.c -- long double version of s_nearbyint.c.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* nearbyintl(x)
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* Return x rounded to integral value according to the prevailing
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* rounding mode.
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* Method:
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* Using floating addition.
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* Exception:
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* Inexact flag raised if x not equal to rintl(x).
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*/
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#include <fenv.h>
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#include <math.h>
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#include <math-barriers.h>
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#include <math_private.h>
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#include <libm-alias-ldouble.h>
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#include <math-use-builtins.h>
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_Float128
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__nearbyintl (_Float128 x)
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{
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#if USE_NEARBYINTL_BUILTIN
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return __builtin_nearbyintl (x);
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#else
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/* Use generic implementation. */
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static const _Float128
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TWO112[2] = {
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L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
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L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
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};
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fenv_t env;
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int64_t i0, j0, sx;
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uint64_t i1 __attribute__ ((unused));
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_Float128 w, t;
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GET_LDOUBLE_WORDS64 (i0, i1, x);
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sx = (((uint64_t) i0) >> 63);
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j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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if (j0 < 112)
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{
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if (j0 < 0)
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{
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feholdexcept (&env);
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w = TWO112[sx] + math_opt_barrier (x);
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t = w - TWO112[sx];
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math_force_eval (t);
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fesetenv (&env);
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GET_LDOUBLE_MSW64 (i0, t);
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SET_LDOUBLE_MSW64 (t, (i0 & 0x7fffffffffffffffLL) | (sx << 63));
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return t;
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}
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}
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else
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{
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if (j0 == 0x4000)
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return x + x; /* inf or NaN */
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else
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return x; /* x is integral */
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}
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feholdexcept (&env);
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w = TWO112[sx] + math_opt_barrier (x);
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t = w - TWO112[sx];
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math_force_eval (t);
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fesetenv (&env);
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return t;
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#endif /* ! USE_NEARBYINTL_BUILTIN */
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}
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libm_alias_ldouble (__nearbyint, nearbyint)
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