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40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* __ieee754_ilogb(). LoongArch version.
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Copyright (C) 2022-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <fpu_control.h>
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int
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__ieee754_ilogb (double x)
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{
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int x_cond;
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asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
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if (__glibc_unlikely (x_cond & _FCLASS_ZERO))
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return FP_ILOGB0;
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else if (__glibc_unlikely (x_cond & ( _FCLASS_NAN | _FCLASS_INF)))
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return FP_ILOGBNAN;
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else
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{
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asm volatile ("fabs.d \t%0, %1" : "=f" (x) : "f" (x));
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asm volatile ("flogb.d \t%0, %1" : "=f" (x) : "f" (x));
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return x;
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}
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}
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