s_shiftLeftM.c

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/*============================================================================
 
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3e, by John R. Hauser.
 
Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
California.  All rights reserved.
 
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modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice,
    this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions, and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
 
 3. Neither the name of the University nor the names of its contributors may
    be used to endorse or promote products derived from this software without
    specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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=============================================================================*/
 
#include <stdint.h>
#include "platform.h"
 
#ifndef softfloat_shiftLeftM
 
#define softfloat_shiftLeftM softfloat_shiftLeftM
#include "primitives.h"
 
void
 softfloat_shiftLeftM(
     uint_fast8_t size_words,
     const uint32_t *aPtr,
     uint32_t dist,
     uint32_t *zPtr
 )
{
    uint32_t wordDist;
    uint_fast8_t innerDist;
    uint32_t *destPtr;
    uint_fast8_t i;
 
    wordDist = dist>>5;
    if ( wordDist < size_words ) {
        aPtr += indexMultiwordLoBut( size_words, wordDist );
        innerDist = dist & 31;
        if ( innerDist ) {
            softfloat_shortShiftLeftM(
                size_words - wordDist,
                aPtr,
                innerDist,
                zPtr + indexMultiwordHiBut( size_words, wordDist )
            );
            if ( ! wordDist ) return;
        } else {
            aPtr += indexWordHi( size_words - wordDist );
            destPtr = zPtr + indexWordHi( size_words );
            for ( i = size_words - wordDist; i; --i ) {
                *destPtr = *aPtr;
                aPtr -= wordIncr;
                destPtr -= wordIncr;
            }
        }
        zPtr += indexMultiwordLo( size_words, wordDist );
    } else {
        wordDist = size_words;
    }
    do {
        *zPtr++ = 0;
        --wordDist;
    } while ( wordDist );
 
}
 
#endif