Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
113 lines
4.4 KiB
C
113 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 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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#ifdef SOFTFLOAT_FAST_INT64
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bool extF80M_le_quiet( const extFloat80_t *aPtr, const extFloat80_t *bPtr )
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{
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return extF80_le_quiet( *aPtr, *bPtr );
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}
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#else
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bool extF80M_le_quiet( const extFloat80_t *aPtr, const extFloat80_t *bPtr )
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{
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const struct extFloat80M *aSPtr, *bSPtr;
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uint_fast16_t uiA64;
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uint64_t uiA0;
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uint_fast16_t uiB64;
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uint64_t uiB0;
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bool signA, ltMags;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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aSPtr = (const struct extFloat80M *) aPtr;
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bSPtr = (const struct extFloat80M *) bPtr;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = aSPtr->signExp;
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uiA0 = aSPtr->signif;
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uiB64 = bSPtr->signExp;
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uiB0 = bSPtr->signif;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( isNaNExtF80UI( uiA64, uiA0 ) || isNaNExtF80UI( uiB64, uiB0 ) ) {
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if (
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softfloat_isSigNaNExtF80UI( uiA64, uiA0 )
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|| softfloat_isSigNaNExtF80UI( uiB64, uiB0 )
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) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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}
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return false;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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signA = signExtF80UI64( uiA64 );
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if ( (uiA64 ^ uiB64) & 0x8000 ) {
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/*--------------------------------------------------------------------
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| Signs are different.
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*--------------------------------------------------------------------*/
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return signA || ! (uiA0 | uiB0);
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} else {
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/*--------------------------------------------------------------------
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| Signs are the same.
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*--------------------------------------------------------------------*/
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if ( ! ((uiA0 & uiB0) & UINT64_C( 0x8000000000000000 )) ) {
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return (softfloat_compareNonnormExtF80M( aSPtr, bSPtr ) <= 0);
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}
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if ( uiA64 == uiB64 ) {
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if ( uiA0 == uiB0 ) return true;
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ltMags = (uiA0 < uiB0);
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} else {
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ltMags = (uiA64 < uiB64);
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}
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return signA ^ ltMags;
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}
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}
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#endif
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