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https://github.com/openhwgroup/cvw
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108 lines
4.1 KiB
C
108 lines
4.1 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 The Regents of the University of California.
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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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bool isSigNaNA;
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const struct extFloat80M *sPtr;
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bool isSigNaNB;
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uint_fast16_t uiB64;
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uint64_t uiB0;
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uint_fast16_t uiA64;
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uint64_t uiA0;
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uint_fast16_t uiMagA64, uiMagB64;
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isSigNaNA = extF80M_isSignalingNaN( (const extFloat80_t *) aSPtr );
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sPtr = aSPtr;
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if ( ! bSPtr ) {
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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 = extF80M_isSignalingNaN( (const extFloat80_t *) bSPtr );
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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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uiB64 = bSPtr->signExp;
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if ( isSigNaNB ) goto returnLargerUIMag;
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uiB0 = bSPtr->signif;
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if ( isNaNExtF80UI( uiB64, uiB0 ) ) goto copyB;
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goto copy;
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} else {
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uiA64 = aSPtr->signExp;
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uiA0 = aSPtr->signif;
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if ( isNaNExtF80UI( uiA64, uiA0 ) ) goto copy;
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goto copyB;
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}
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}
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uiB64 = bSPtr->signExp;
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returnLargerUIMag:
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uiA64 = aSPtr->signExp;
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uiMagA64 = uiA64 & 0x7FFF;
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uiMagB64 = uiB64 & 0x7FFF;
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if ( uiMagA64 < uiMagB64 ) goto copyB;
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if ( uiMagB64 < uiMagA64 ) goto copy;
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uiA0 = aSPtr->signif;
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uiB0 = bSPtr->signif;
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if ( uiA0 < uiB0 ) goto copyB;
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if ( uiB0 < uiA0 ) goto copy;
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if ( uiA64 < uiB64 ) goto copy;
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copyB:
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sPtr = bSPtr;
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copy:
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zSPtr->signExp = sPtr->signExp;
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zSPtr->signif = sPtr->signif | UINT64_C( 0xC000000000000000 );
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}
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