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6a3866dae9
This patch just adjusts the generic implementation regarding code style. No functional change. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* s_rintf.c -- float version of s_rint.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/* Adapted for use as nearbyint by Ulrich Drepper <drepper@cygnus.com>. */
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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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#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 <fenv_private.h>
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#include <libm-alias-float.h>
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#include <math-use-builtins.h>
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float
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__nearbyintf (float x)
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{
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#if USE_NEARBYINTF_BUILTIN
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return __builtin_nearbyintf (x);
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#else
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/* Use generic implementation. */
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static const float
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TWO23[2] = {
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8.3886080000e+06, /* 0x4b000000 */
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-8.3886080000e+06, /* 0xcb000000 */
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};
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fenv_t env;
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int32_t i0, j0, sx;
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float w, t;
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GET_FLOAT_WORD (i0, x);
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sx = (i0 >> 31) & 1;
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j0 = ((i0 >> 23) & 0xff) - 0x7f;
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if (j0 < 23)
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{
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if (j0 < 0)
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{
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libc_feholdexceptf (&env);
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w = TWO23[sx] + math_opt_barrier (x);
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t = w - TWO23[sx];
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math_force_eval (t);
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libc_fesetenvf (&env);
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GET_FLOAT_WORD (i0, t);
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SET_FLOAT_WORD (t, (i0 & 0x7fffffff) | (sx << 31));
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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 (__glibc_unlikely (j0 == 0x80))
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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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libc_feholdexceptf (&env);
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w = TWO23[sx] + math_opt_barrier (x);
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t = w - TWO23[sx];
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math_force_eval (t);
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libc_fesetenvf (&env);
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return t;
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#endif /* ! USE_NEARBYINT_BUILTIN */
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}
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libm_alias_float (__nearbyint, nearbyint)
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