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ae3577f607
This patch is using the corresponding GCC builtin for nearbyintf, nearbyint, nearbintl and nearbyintf128 if the USE_FUNCTION_BUILTIN macros are defined to one in math-use-builtins.h. This is the case for s390 if build with at least --march=z196 --mzarch. Otherwise the generic implementation is used. The code of the generic implementation is not changed. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
68 lines
1.7 KiB
C
68 lines
1.7 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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if(j0<0) {
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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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} else {
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if(__builtin_expect(j0==0x80, 0)) return x+x; /* inf or NaN */
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else 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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