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82 lines
3.7 KiB
C
82 lines
3.7 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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| Interpreting `uiA' and `uiB' as the bit patterns of two 32-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either `uiA' or `uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast32_t
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softfloat_propagateNaNF32UI( uint_fast32_t uiA, uint_fast32_t uiB )
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{
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bool isSigNaNA, isSigNaNB;
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uint_fast32_t uiNonsigA, uiNonsigB, uiMagA, uiMagB;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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isSigNaNA = softfloat_isSigNaNF32UI( uiA );
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isSigNaNB = softfloat_isSigNaNF32UI( uiB );
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/*------------------------------------------------------------------------
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| Make NaNs non-signaling.
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*------------------------------------------------------------------------*/
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uiNonsigA = uiA | 0x00400000;
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uiNonsigB = uiB | 0x00400000;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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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 returnLargerMag;
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return isNaNF32UI( uiB ) ? uiNonsigB : uiNonsigA;
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} else {
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return isNaNF32UI( uiA ) ? uiNonsigA : uiNonsigB;
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}
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}
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returnLargerMag:
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uiMagA = uiNonsigA & 0x7FFFFFFF;
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uiMagB = uiNonsigB & 0x7FFFFFFF;
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if ( uiMagA < uiMagB ) return uiNonsigB;
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if ( uiMagB < uiMagA ) return uiNonsigA;
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return (uiNonsigA < uiNonsigB) ? uiNonsigA : uiNonsigB;
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}
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