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124 lines
4.0 KiB
C
124 lines
4.0 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 3, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of
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California (Regents). All Rights Reserved. Redistribution and use in source
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and binary forms, with or without modification, are permitted provided that
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the following conditions are met:
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Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer in the
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documentation and/or other materials provided with the distribution. Neither
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the name of the Regents nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior
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written permission.
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IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
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BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
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HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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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 count,
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uint64_t *zPtr
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)
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{
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uint_fast8_t negCount;
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unsigned int index, lastIndex;
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uint64_t partWordZ, wordA;
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negCount = -count;
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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>>count;
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if ( partWordZ<<count != 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<<(negCount & 63) | partWordZ;
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index += wordIncr;
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partWordZ = wordA>>count;
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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 count, uint64_t *zPtr )
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{
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uint64_t wordJam;
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uint_fast32_t wordCount;
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uint64_t *ptr;
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uint_fast8_t i, innerCount;
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wordJam = 0;
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wordCount = count>>6;
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if ( wordCount ) {
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if ( 4 < wordCount ) wordCount = 4;
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ptr = (uint64_t *) (aPtr + indexMultiwordLo( 4, wordCount ));
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i = wordCount;
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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 ( wordCount < 4 ) {
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aPtr += indexMultiwordHiBut( 4, wordCount );
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innerCount = count & 63;
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if ( innerCount ) {
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softfloat_shortShiftRightJamM(
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4 - wordCount,
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aPtr,
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innerCount,
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zPtr + indexMultiwordLoBut( 4, wordCount )
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);
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if ( ! wordCount ) goto wordJam;
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} else {
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aPtr += indexWordLo( 4 - wordCount );
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ptr = zPtr + indexWordLo( 4 );
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for ( i = 4 - wordCount; 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, wordCount );
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}
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do {
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*ptr++ = 0;
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--wordCount;
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} while ( wordCount );
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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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