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5fe2647d31
Use hardware Floating-point instruction fclass.{s/d} to implement
classification functions, i.e finite{f/ }, fpclassify{f/ }, isnan{f/ },
isinf{f/ }, issignaling{f/ }.
* sysdeps/loongarch/fpu/s_finite.c: New file.
* sysdeps/loongarch/fpu/s_finitef.c: Likewise.
* sysdeps/loongarch/fpu/s_fpclassify.c: Likewise.
* sysdeps/loongarch/fpu/s_fpclassifyf.c: Likewise.
* sysdeps/loongarch/fpu/s_isinf.c: Likewise.
* sysdeps/loongarch/fpu/s_isinff.c: Likewise.
* sysdeps/loongarch/fpu/s_isnan.c: Likewise.
* sysdeps/loongarch/fpu/s_isnanf.c: Likewise.
* sysdeps/loongarch/fpu/s_issignaling.c: Likewise.
* sysdeps/loongarch/fpu/s_issignalingf.c: Likewise.
* sysdeps/loongarch/fpu_control.h: Add _FCLASS_* macro.
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/* fpclassify(). LoongArch version.
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Copyright (C) 2017-2022 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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#include <math.h>
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#include <fenv_private.h>
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int
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__fpclassify (double x)
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{
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int cls;
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asm volatile ("fclass.d \t%0, %1" : "=f" (cls) : "f" (x));
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if (__glibc_likely (!!(cls & _FCLASS_NORM)))
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return FP_NORMAL;
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if (__glibc_likely (!!(cls & _FCLASS_ZERO)))
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return FP_ZERO;
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if (__glibc_likely (!!(cls & _FCLASS_SUBNORM)))
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return FP_SUBNORMAL;
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if (__glibc_likely (!!(cls & _FCLASS_INF)))
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return FP_INFINITE;
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return FP_NAN;
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}
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libm_hidden_def (__fpclassify)
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