101 lines
4.1 KiB
C
101 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_mul128MTo256M
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void
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softfloat_mul128MTo256M(
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const uint32_t *aPtr, const uint32_t *bPtr, uint32_t *zPtr )
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{
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uint32_t *lastZPtr, wordB;
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uint64_t dwordProd;
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uint32_t wordZ;
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uint_fast8_t carry;
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bPtr += indexWordLo( 4 );
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lastZPtr = zPtr + indexMultiwordHi( 8, 5 );
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zPtr += indexMultiwordLo( 8, 5 );
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wordB = *bPtr;
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dwordProd = (uint64_t) aPtr[indexWord( 4, 0 )] * wordB;
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zPtr[indexWord( 5, 0 )] = dwordProd;
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dwordProd = (uint64_t) aPtr[indexWord( 4, 1 )] * wordB + (dwordProd>>32);
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zPtr[indexWord( 5, 1 )] = dwordProd;
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dwordProd = (uint64_t) aPtr[indexWord( 4, 2 )] * wordB + (dwordProd>>32);
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zPtr[indexWord( 5, 2 )] = dwordProd;
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dwordProd = (uint64_t) aPtr[indexWord( 4, 3 )] * wordB + (dwordProd>>32);
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zPtr[indexWord( 5, 3 )] = dwordProd;
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zPtr[indexWord( 5, 4 )] = dwordProd>>32;
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do {
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bPtr += wordIncr;
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zPtr += wordIncr;
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wordB = *bPtr;
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dwordProd = (uint64_t) aPtr[indexWord( 4, 0 )] * wordB;
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wordZ = zPtr[indexWord( 5, 0 )] + (uint32_t) dwordProd;
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zPtr[indexWord( 5, 0 )] = wordZ;
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carry = (wordZ < (uint32_t) dwordProd);
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dwordProd =
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(uint64_t) aPtr[indexWord( 4, 1 )] * wordB + (dwordProd>>32);
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wordZ = zPtr[indexWord( 5, 1 )] + (uint32_t) dwordProd + carry;
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zPtr[indexWord( 5, 1 )] = wordZ;
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if ( wordZ != (uint32_t) dwordProd ) {
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carry = (wordZ < (uint32_t) dwordProd);
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}
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dwordProd =
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(uint64_t) aPtr[indexWord( 4, 2 )] * wordB + (dwordProd>>32);
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wordZ = zPtr[indexWord( 5, 2 )] + (uint32_t) dwordProd + carry;
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zPtr[indexWord( 5, 2 )] = wordZ;
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if ( wordZ != (uint32_t) dwordProd ) {
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carry = (wordZ < (uint32_t) dwordProd);
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}
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dwordProd =
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(uint64_t) aPtr[indexWord( 4, 3 )] * wordB + (dwordProd>>32);
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wordZ = zPtr[indexWord( 5, 3 )] + (uint32_t) dwordProd + carry;
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zPtr[indexWord( 5, 3 )] = wordZ;
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if ( wordZ != (uint32_t) dwordProd ) {
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carry = (wordZ < (uint32_t) dwordProd);
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}
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zPtr[indexWord( 5, 4 )] = (dwordProd>>32) + carry;
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} while ( zPtr != lastZPtr );
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}
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#endif
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