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98 lines
4.0 KiB
C
98 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_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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carry =
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carry ? (wordZ <= (uint32_t) dwordProd)
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: (wordZ < (uint32_t) dwordProd);
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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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carry =
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carry ? (wordZ <= (uint32_t) dwordProd)
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: (wordZ < (uint32_t) dwordProd);
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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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carry =
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carry ? (wordZ <= (uint32_t) dwordProd)
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: (wordZ < (uint32_t) dwordProd);
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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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