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f82996f815
This patch is using the corresponding GCC builtin for roundf, round, roundl and roundf128 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>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* Round float to integer away from zero.
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Copyright (C) 1997-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define NO_MATH_REDIRECT
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#include <math.h>
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#include <math_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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__roundf (float x)
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{
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#if USE_ROUNDF_BUILTIN
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return __builtin_roundf (x);
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#else
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/* Use generic implementation. */
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int32_t i0, j0;
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GET_FLOAT_WORD (i0, x);
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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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i0 &= 0x80000000;
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if (j0 == -1)
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i0 |= 0x3f800000;
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}
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else
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{
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uint32_t i = 0x007fffff >> j0;
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if ((i0 & i) == 0)
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/* X is integral. */
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return x;
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i0 += 0x00400000 >> j0;
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i0 &= ~i;
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}
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}
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else
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{
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if (j0 == 0x80)
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/* Inf or NaN. */
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return x + x;
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else
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return x;
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}
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SET_FLOAT_WORD (x, i0);
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return x;
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#endif /* ! USE_ROUNDF_BUILTIN */
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}
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libm_alias_float (__round, round)
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