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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Copyright (C) 2007-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson.
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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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<http://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <libm-alias-float.h>
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/* Use the chopped rounding mode conversion instructions to implement trunc. */
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float
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__truncf (float x)
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{
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float two23 = copysignf (0x1.0p23, x);
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float r, tmp;
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if (isgreaterequal (fabsf (x), 0x1.0p23))
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return x;
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__asm (
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"adds/suc %2, %3, %1\n\tsubs/suc %1, %3, %0"
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: "=&f"(r), "=&f"(tmp)
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: "f"(x), "f"(two23));
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/* trunc(-0) == -0, and in general we'll always have the same
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sign as our input. */
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return copysignf (r, x);
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}
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libm_alias_float (__trunc, trunc)
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