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https://github.com/openhwgroup/cvw
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106 lines
4.5 KiB
C
106 lines
4.5 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, 2018 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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| Interpreting the unsigned integer formed from concatenating 'uiA64' and
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| 'uiA0' as a 128-bit floating-point value, and likewise interpreting the
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| unsigned integer formed from concatenating 'uiB64' and 'uiB0' as another
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| 128-bit floating-point value, and assuming at least on of these floating-
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| point values is a NaN, returns the bit pattern of the combined NaN result.
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| If either original floating-point value is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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struct uint128
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softfloat_propagateNaNF128UI(
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uint_fast64_t uiA64,
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uint_fast64_t uiA0,
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uint_fast64_t uiB64,
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uint_fast64_t uiB0
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)
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{
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bool isSigNaNA, isSigNaNB;
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uint_fast64_t uiNonsigA64, uiNonsigB64, uiMagA64, uiMagB64;
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struct uint128 uiZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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isSigNaNA = softfloat_isSigNaNF128UI( uiA64, uiA0 );
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isSigNaNB = softfloat_isSigNaNF128UI( uiB64, uiB0 );
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/*------------------------------------------------------------------------
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| Make NaNs non-signaling.
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*------------------------------------------------------------------------*/
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uiNonsigA64 = uiA64 | UINT64_C( 0x0000800000000000 );
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uiNonsigB64 = uiB64 | UINT64_C( 0x0000800000000000 );
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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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if ( isNaNF128UI( uiB64, uiB0 ) ) goto returnB;
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goto returnA;
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} else {
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if ( isNaNF128UI( uiA64, uiA0 ) ) goto returnA;
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goto returnB;
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}
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}
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returnLargerMag:
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uiMagA64 = uiA64 & UINT64_C( 0x7FFFFFFFFFFFFFFF );
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uiMagB64 = uiB64 & UINT64_C( 0x7FFFFFFFFFFFFFFF );
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if ( uiMagA64 < uiMagB64 ) goto returnB;
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if ( uiMagB64 < uiMagA64 ) goto returnA;
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if ( uiA0 < uiB0 ) goto returnB;
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if ( uiB0 < uiA0 ) goto returnA;
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if ( uiNonsigA64 < uiNonsigB64 ) goto returnA;
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returnB:
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uiZ.v64 = uiNonsigB64;
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uiZ.v0 = uiB0;
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return uiZ;
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returnA:
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uiZ.v64 = uiNonsigA64;
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uiZ.v0 = uiA0;
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return uiZ;
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}
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