94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/*
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This Software is provided under the Zope Public License (ZPL) Version 2.1.
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Copyright (c) 2009, 2010 by the mingw-w64 project
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See the AUTHORS file for the list of contributors to the mingw-w64 project.
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This license has been certified as open source. It has also been designated
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as GPL compatible by the Free Software Foundation (FSF).
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions in source code must retain the accompanying copyright
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notice, this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the accompanying
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copyright notice, this list of conditions, and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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3. Names of the copyright holders must not be used to endorse or promote
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products derived from this software without prior written permission
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from the copyright holders.
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4. The right to distribute this software or to use it for any purpose does
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not give you the right to use Servicemarks (sm) or Trademarks (tm) of
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the copyright holders. Use of them is covered by separate agreement
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with the copyright holders.
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5. If any files are modified, you must cause the modified files to carry
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prominent notices stating that you changed the files and the date of
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any change.
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Disclaimer
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "complex_internal.h"
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#include <errno.h>
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#if defined(__arm__) || defined(_ARM_)
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/* This works around a compiler bug, normally you would inline it with e.g.
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* asm ("fsqrts %[dst], %[src];\n" : [dst] "=w" (res) : [src] "w" (x));
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*/
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__FLT_TYPE __fsqrt_internal( __FLT_TYPE x );
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asm(".def __fsqrt_internal; .scl 2; .type 32; .endef\n"
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"\t.text\n"
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"\t.align 4\n"
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"\t.globl __fsqrt_internal\n"
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"__fsqrt_internal:\n"
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#if _NEW_COMPLEX_FLOAT
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"\t" "fsqrts s0, s0\n"
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#else
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"\t" "fsqrtd d0, d0\n"
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#endif /* _NEW_COMPLEX_FLOAT */
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"\tbx lr");
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#endif /* defined(__arm__) || defined(_ARM_) */
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__FLT_TYPE
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__FLT_ABI (sqrt) (__FLT_TYPE x)
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{
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__FLT_TYPE res = __FLT_CST (0.0);
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int x_class = fpclassify (x);
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if (x_class == FP_NAN || signbit (x))
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{
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if (x_class == FP_ZERO)
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return __FLT_CST (-0.0);
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__FLT_RPT_DOMAIN ("sqrt", x, 0.0, x);
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return x;
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}
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else if (x_class == FP_ZERO)
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return __FLT_CST (0.0);
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else if (x_class == FP_INFINITE)
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return __FLT_HUGE_VAL;
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else if (x == __FLT_CST (1.0))
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return __FLT_CST (1.0);
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#if defined(__arm__) || defined(_ARM_)
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__fsqrt_internal(x);
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#elif defined(_X86_) || defined(__i386__) || defined(_AMD64_) || defined(__x86_64__)
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asm ("fsqrt" : "=t" (res) : "0" (x));
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#else
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#error Not supported on your platform yet
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#endif
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return res;
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}
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