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106 lines
4.4 KiB
C
106 lines
4.4 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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/*----------------------------------------------------------------------------
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| Assuming at least one of the two 128-bit floating-point values pointed to by
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| `aWPtr' and `bWPtr' is a NaN, stores the combined NaN result at the location
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| pointed to by `zWPtr'. If either original floating-point value is a
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| signaling NaN, the invalid exception is raised. Each of `aWPtr', `bWPtr',
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| and `zWPtr' points to an array of four 32-bit elements that concatenate in
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| the platform's normal endian order to form a 128-bit floating-point value.
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*----------------------------------------------------------------------------*/
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void
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softfloat_propagateNaNF128M(
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const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr )
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{
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bool isSigNaNA;
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const uint32_t *ptr;
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bool isSigNaNB;
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uint32_t uiA96, uiB96, wordMagA, wordMagB;
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isSigNaNA = f128M_isSignalingNaN( (const float128_t *) aWPtr );
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ptr = aWPtr;
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if ( ! bWPtr ) {
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if ( isSigNaNA ) softfloat_raiseFlags( softfloat_flag_invalid );
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goto copy;
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}
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isSigNaNB = f128M_isSignalingNaN( (const float128_t *) bWPtr );
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if ( isSigNaNA | isSigNaNB ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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if ( isSigNaNA ) {
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if ( isSigNaNB ) goto returnLargerUIMag;
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if ( softfloat_isNaNF128M( bWPtr ) ) goto copyB;
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goto copy;
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} else {
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if ( softfloat_isNaNF128M( aWPtr ) ) goto copy;
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goto copyB;
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}
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}
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returnLargerUIMag:
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uiA96 = aWPtr[indexWordHi( 4 )];
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uiB96 = bWPtr[indexWordHi( 4 )];
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wordMagA = uiA96 & 0x7FFFFFFF;
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wordMagB = uiB96 & 0x7FFFFFFF;
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if ( wordMagA < wordMagB ) goto copyB;
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if ( wordMagB < wordMagA ) goto copy;
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wordMagA = aWPtr[indexWord( 4, 2 )];
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wordMagB = bWPtr[indexWord( 4, 2 )];
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if ( wordMagA < wordMagB ) goto copyB;
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if ( wordMagB < wordMagA ) goto copy;
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wordMagA = aWPtr[indexWord( 4, 1 )];
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wordMagB = bWPtr[indexWord( 4, 1 )];
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if ( wordMagA < wordMagB ) goto copyB;
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if ( wordMagB < wordMagA ) goto copy;
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wordMagA = aWPtr[indexWord( 4, 0 )];
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wordMagB = bWPtr[indexWord( 4, 0 )];
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if ( wordMagA < wordMagB ) goto copyB;
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if ( wordMagB < wordMagA ) goto copy;
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if ( uiA96 < uiB96 ) goto copy;
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copyB:
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ptr = bWPtr;
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copy:
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zWPtr[indexWordHi( 4 )] = ptr[indexWordHi( 4 )] | 0x00008000;
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zWPtr[indexWord( 4, 2 )] = ptr[indexWord( 4, 2 )];
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zWPtr[indexWord( 4, 1 )] = ptr[indexWord( 4, 1 )];
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zWPtr[indexWord( 4, 0 )] = ptr[indexWord( 4, 0 )];
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}
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