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https://github.com/openhwgroup/cvw
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87 lines
3.3 KiB
C
87 lines
3.3 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 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2017 The Regents of the University of
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California. All rights reserved.
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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 of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 80-bit extended floating-point values
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| pointed to by 'aSPtr' and 'bSPtr' is a NaN, stores the combined NaN result
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| at the location pointed to by 'zSPtr'. If either original floating-point
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| value is a signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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void
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softfloat_propagateNaNExtF80M(
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const struct extFloat80M *aSPtr,
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const struct extFloat80M *bSPtr,
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struct extFloat80M *zSPtr
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)
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{
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const struct extFloat80M *sPtr;
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bool isSigNaNA;
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uint_fast16_t uiZ64;
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uint_fast64_t uiZ0;
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sPtr = aSPtr;
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isSigNaNA = extF80M_isSignalingNaN( (const extFloat80_t *) aSPtr );
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if (
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isSigNaNA
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|| (bSPtr
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&& extF80M_isSignalingNaN( (const extFloat80_t *) bSPtr ))
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) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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if ( isSigNaNA ) goto copyNonsig;
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goto copyNonsigB;
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}
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uiZ64 = sPtr->signExp;
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uiZ0 = sPtr->signif;
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if ( isNaNExtF80UI( uiZ64, uiZ0 ) ) goto returnNonsig;
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copyNonsigB:
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sPtr = bSPtr;
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copyNonsig:
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uiZ64 = sPtr->signExp;
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uiZ0 = sPtr->signif;
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returnNonsig:
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zSPtr->signExp = uiZ64;
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zSPtr->signif = uiZ0 | UINT64_C( 0xC000000000000000 );
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}
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