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64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* Copyright (C) 1989-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "soft-fp.h"
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#include "quad-float128.h"
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/* __powikf3 can be compiled 3 different ways:
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1) If the assembler does not have support for the IEEE 128-bit insns
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(xsaddqp, etc.) it is just compiled as __powikf2.
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2) If the assembler has IEEE 128-bit floating point support, and __powikf2
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is not previously defined, it is defined as __powikf2_sw.
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3) If the assembler has IEEE 128-bit floating point support, and __powikf2
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is included by _powikf2-hw.c, which defines __powikf2 as __powikf2_hw. The
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__powikf2_hw.c is compiled with -mcpu=power9 and it automatically uses the
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IEEE 128-bit instructions.
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For #2/#3, float128-ifunc.c defines an ifunc function for __powikf2, that
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will use the software version on power7/power8 systems, and the hardware
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version on power9 systems.
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The code is cloned from the code in libgcc2.c (which handles the standard
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SF, DF, TF, and XF types). */
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#if defined(FLOAT128_HW_INSNS) && !defined(__powikf2)
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#define __powikf2 __powikf2_sw
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#endif
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TFtype
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__powikf2 (TFtype x, SItype_ppc m)
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{
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unsigned int n = m < 0 ? -m : m;
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TFtype y = n % 2 ? x : 1;
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while (n >>= 1)
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{
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x = x * x;
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if (n % 2)
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y = y * x;
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}
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return m < 0 ? 1/y : y;
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}
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