112 lines
4.3 KiB
C
112 lines
4.3 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 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 <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "softfloat_types.h"
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int
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softfloat_compareNonnormExtF80M(
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const struct extFloat80M *aSPtr, const struct extFloat80M *bSPtr )
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{
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uint_fast16_t uiA64, uiB64;
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uint64_t sigA;
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bool signB;
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uint64_t sigB;
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int32_t expA, expB;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = aSPtr->signExp;
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uiB64 = bSPtr->signExp;
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sigA = aSPtr->signif;
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signB = signExtF80UI64( uiB64 );
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sigB = bSPtr->signif;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( (uiA64 ^ uiB64) & 0x8000 ) {
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if ( ! (sigA | sigB) ) return 0;
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goto resultFromSignB;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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expA = expExtF80UI64( uiA64 );
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expB = expExtF80UI64( uiB64 );
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if ( expA == 0x7FFF ) {
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if (expB == 0x7FFF) return 0;
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signB = ! signB;
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goto resultFromSignB;
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}
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if ( expB == 0x7FFF ) {
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goto resultFromSignB;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( ! expA ) expA = 1;
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if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
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if ( sigA ) {
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expA += softfloat_normExtF80SigM( &sigA );
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} else {
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expA = -128;
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}
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}
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if ( ! expB ) expB = 1;
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if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) {
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if ( sigB ) {
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expB += softfloat_normExtF80SigM( &sigB );
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} else {
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expB = -128;
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}
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( signB ) {
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if ( expA < expB ) return 1;
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if ( (expB < expA) || (sigB < sigA) ) return -1;
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} else {
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if ( expB < expA ) return 1;
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if ( (expA < expB) || (sigA < sigB) ) return -1;
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}
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return (sigA != sigB);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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resultFromSignB:
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return signB ? 1 : -1;
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}
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