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90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
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(Regents). All Rights Reserved. Redistribution and use in source and binary
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forms, with or without modification, are permitted provided that the following
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conditions are met:
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Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer in the
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documentation and/or other materials provided with the distribution. Neither
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the name of the Regents nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior
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written permission.
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IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
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BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
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HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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#ifdef SOFTFLOAT_FAST_INT64
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bool f128M_eq_signaling( const float128_t *aPtr, const float128_t *bPtr )
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{
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return f128_eq_signaling( *aPtr, *bPtr );
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}
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#else
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bool f128M_eq_signaling( const float128_t *aPtr, const float128_t *bPtr )
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{
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const uint32_t *aWPtr, *bWPtr;
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uint32_t wordA, wordB, uiA96, uiB96;
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bool possibleOppositeZeros;
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uint32_t mashWord;
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aWPtr = (const uint32_t *) aPtr;
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bWPtr = (const uint32_t *) bPtr;
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if ( softfloat_isNaNF128M( aWPtr ) || softfloat_isNaNF128M( bWPtr ) ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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return false;
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}
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wordA = aWPtr[indexWord( 4, 2 )];
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wordB = bWPtr[indexWord( 4, 2 )];
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if ( wordA != wordB ) return false;
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uiA96 = aWPtr[indexWordHi( 4 )];
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uiB96 = bWPtr[indexWordHi( 4 )];
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possibleOppositeZeros = false;
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if ( uiA96 != uiB96 ) {
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possibleOppositeZeros = (((uiA96 | uiB96) & 0x7FFFFFFF) == 0);
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if ( ! possibleOppositeZeros ) return false;
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}
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mashWord = wordA | wordB;
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wordA = aWPtr[indexWord( 4, 1 )];
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wordB = bWPtr[indexWord( 4, 1 )];
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if ( wordA != wordB ) return false;
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mashWord |= wordA | wordB;
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wordA = aWPtr[indexWord( 4, 0 )];
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wordB = bWPtr[indexWord( 4, 0 )];
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return
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(wordA == wordB)
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&& (! possibleOppositeZeros || ((mashWord | wordA | wordB) == 0));
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}
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#endif
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