127 lines
4.1 KiB
C
127 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, 2015, 2016 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 <stdint.h>
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#include "platform.h"
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#include "primitiveTypes.h"
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#ifndef softfloat_shiftRightJam256M
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static
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void
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softfloat_shortShiftRightJamM(
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uint_fast8_t size_words,
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const uint64_t *aPtr,
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uint_fast8_t dist,
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uint64_t *zPtr
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)
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{
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uint_fast8_t uNegDist;
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unsigned int index, lastIndex;
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uint64_t partWordZ, wordA;
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uNegDist = -dist;
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index = indexWordLo( size_words );
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lastIndex = indexWordHi( size_words );
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wordA = aPtr[index];
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partWordZ = wordA>>dist;
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if ( partWordZ<<dist != wordA ) partWordZ |= 1;
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while ( index != lastIndex ) {
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wordA = aPtr[index + wordIncr];
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zPtr[index] = wordA<<(uNegDist & 63) | partWordZ;
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index += wordIncr;
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partWordZ = wordA>>dist;
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}
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zPtr[index] = partWordZ;
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}
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void
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softfloat_shiftRightJam256M(
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const uint64_t *aPtr, uint_fast32_t dist, uint64_t *zPtr )
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{
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uint64_t wordJam;
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uint_fast32_t wordDist;
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uint64_t *ptr;
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uint_fast8_t i, innerDist;
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wordJam = 0;
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wordDist = dist>>6;
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if ( wordDist ) {
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if ( 4 < wordDist ) wordDist = 4;
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ptr = (uint64_t *) (aPtr + indexMultiwordLo( 4, wordDist ));
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i = wordDist;
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do {
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wordJam = *ptr++;
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if ( wordJam ) break;
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--i;
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} while ( i );
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ptr = zPtr;
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}
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if ( wordDist < 4 ) {
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aPtr += indexMultiwordHiBut( 4, wordDist );
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innerDist = dist & 63;
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if ( innerDist ) {
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softfloat_shortShiftRightJamM(
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4 - wordDist,
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aPtr,
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innerDist,
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zPtr + indexMultiwordLoBut( 4, wordDist )
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);
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if ( ! wordDist ) goto wordJam;
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} else {
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aPtr += indexWordLo( 4 - wordDist );
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ptr = zPtr + indexWordLo( 4 );
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for ( i = 4 - wordDist; i; --i ) {
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*ptr = *aPtr;
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aPtr += wordIncr;
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ptr += wordIncr;
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}
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}
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ptr = zPtr + indexMultiwordHi( 4, wordDist );
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}
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do {
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*ptr++ = 0;
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--wordDist;
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} while ( wordDist );
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wordJam:
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if ( wordJam ) zPtr[indexWordLo( 4 )] |= 1;
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}
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#endif
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