root / testing / matgen / HPL_lmul.c @ 9
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| 1 | 1 | equemene | /*
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| 2 | 1 | equemene | * -- High Performance Computing Linpack Benchmark (HPL)
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| 3 | 1 | equemene | * HPL - 2.0 - September 10, 2008
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| 4 | 1 | equemene | * Antoine P. Petitet
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| 5 | 1 | equemene | * University of Tennessee, Knoxville
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| 6 | 1 | equemene | * Innovative Computing Laboratory
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| 7 | 1 | equemene | * (C) Copyright 2000-2008 All Rights Reserved
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| 8 | 1 | equemene | *
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| 9 | 1 | equemene | * -- Copyright notice and Licensing terms:
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| 10 | 1 | equemene | *
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| 11 | 1 | equemene | * Redistribution and use in source and binary forms, with or without
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| 12 | 1 | equemene | * modification, are permitted provided that the following conditions
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| 13 | 1 | equemene | * are met:
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| 14 | 1 | equemene | *
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| 15 | 1 | equemene | * 1. Redistributions of source code must retain the above copyright
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| 16 | 1 | equemene | * notice, this list of conditions and the following disclaimer.
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| 17 | 1 | equemene | *
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| 18 | 1 | equemene | * 2. Redistributions in binary form must reproduce the above copyright
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| 19 | 1 | equemene | * notice, this list of conditions, and the following disclaimer in the
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| 20 | 1 | equemene | * documentation and/or other materials provided with the distribution.
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| 21 | 1 | equemene | *
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| 22 | 1 | equemene | * 3. All advertising materials mentioning features or use of this
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| 23 | 1 | equemene | * software must display the following acknowledgement:
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| 24 | 1 | equemene | * This product includes software developed at the University of
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| 25 | 1 | equemene | * Tennessee, Knoxville, Innovative Computing Laboratory.
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| 26 | 1 | equemene | *
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| 27 | 1 | equemene | * 4. The name of the University, the name of the Laboratory, or the
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| 28 | 1 | equemene | * names of its contributors may not be used to endorse or promote
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| 29 | 1 | equemene | * products derived from this software without specific written
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| 30 | 1 | equemene | * permission.
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| 31 | 1 | equemene | *
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| 32 | 1 | equemene | * -- Disclaimer:
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| 33 | 1 | equemene | *
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| 34 | 1 | equemene | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 35 | 1 | equemene | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 36 | 1 | equemene | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 37 | 1 | equemene | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY
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| 38 | 1 | equemene | * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 39 | 1 | equemene | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 40 | 1 | equemene | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 41 | 1 | equemene | * DATA OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 42 | 1 | equemene | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 43 | 1 | equemene | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 44 | 1 | equemene | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 45 | 1 | equemene | * ---------------------------------------------------------------------
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| 46 | 1 | equemene | */
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| 47 | 1 | equemene | /*
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| 48 | 1 | equemene | * Include files
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| 49 | 1 | equemene | */
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| 50 | 1 | equemene | #include "hpl.h" |
| 51 | 1 | equemene | |
| 52 | 1 | equemene | #ifdef STDC_HEADERS
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| 53 | 1 | equemene | void HPL_lmul
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| 54 | 1 | equemene | ( |
| 55 | 1 | equemene | int * K,
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| 56 | 1 | equemene | int * J,
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| 57 | 1 | equemene | int * I
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| 58 | 1 | equemene | ) |
| 59 | 1 | equemene | #else
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| 60 | 1 | equemene | void HPL_lmul
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| 61 | 1 | equemene | ( K, J, I ) |
| 62 | 1 | equemene | int * K;
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| 63 | 1 | equemene | int * J;
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| 64 | 1 | equemene | int * I;
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| 65 | 1 | equemene | #endif
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| 66 | 1 | equemene | {
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| 67 | 1 | equemene | /*
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| 68 | 1 | equemene | * Purpose
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| 69 | 1 | equemene | * =======
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| 70 | 1 | equemene | *
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| 71 | 1 | equemene | * HPL_lmul multiplies without carry two long positive integers K and J
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| 72 | 1 | equemene | * and puts the result into I. The long integers I, J, K are encoded on
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| 73 | 1 | equemene | * 32 bits using an array of 2 integers. The 32-lower bits are stored in
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| 74 | 1 | equemene | * the first entry of each array, the 32-higher bits in the second entry
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| 75 | 1 | equemene | * of each array. For efficiency purposes, the intrisic modulo function
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| 76 | 1 | equemene | * is inlined.
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| 77 | 1 | equemene | *
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| 78 | 1 | equemene | * Arguments
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| 79 | 1 | equemene | * =========
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| 80 | 1 | equemene | *
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| 81 | 1 | equemene | * K (local input) int *
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| 82 | 1 | equemene | * On entry, K is an integer array of dimension 2 containing the
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| 83 | 1 | equemene | * encoded long integer K.
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| 84 | 1 | equemene | *
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| 85 | 1 | equemene | * J (local input) int *
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| 86 | 1 | equemene | * On entry, J is an integer array of dimension 2 containing the
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| 87 | 1 | equemene | * encoded long integer J.
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| 88 | 1 | equemene | *
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| 89 | 1 | equemene | * I (local output) int *
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| 90 | 1 | equemene | * On entry, I is an integer array of dimension 2. On exit, this
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| 91 | 1 | equemene | * array contains the encoded long integer result.
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| 92 | 1 | equemene | *
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| 93 | 1 | equemene | * ---------------------------------------------------------------------
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| 94 | 1 | equemene | */
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| 95 | 1 | equemene | /*
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| 96 | 1 | equemene | * .. Local Variables ..
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| 97 | 1 | equemene | */
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| 98 | 1 | equemene | int r, c;
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| 99 | 1 | equemene | unsigned int kk[4], jj[4], res[5]; |
| 100 | 1 | equemene | /* ..
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| 101 | 1 | equemene | * .. Executable Statements ..
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| 102 | 1 | equemene | */
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| 103 | 1 | equemene | /*
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| 104 | 1 | equemene | * Addition is done with 16 bits at a time. Multiplying two 16-bit
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| 105 | 1 | equemene | * integers yields a 32-bit result. The lower 16-bits of the result
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| 106 | 1 | equemene | * are kept in I, and the higher 16-bits are carried over to the
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| 107 | 1 | equemene | * next multiplication.
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| 108 | 1 | equemene | */
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| 109 | 1 | equemene | for (c = 0; c < 2; ++c) { |
| 110 | 1 | equemene | kk[2*c] = K[c] & 65535; |
| 111 | 1 | equemene | kk[2*c+1] = ((unsigned)K[c] >> 16) & 65535; |
| 112 | 1 | equemene | jj[2*c] = J[c] & 65535; |
| 113 | 1 | equemene | jj[2*c+1] = ((unsigned)J[c] >> 16) & 65535; |
| 114 | 1 | equemene | } |
| 115 | 1 | equemene | |
| 116 | 1 | equemene | res[0] = 0; |
| 117 | 1 | equemene | for (c = 0; c < 4; ++c) { |
| 118 | 1 | equemene | res[c+1] = (res[c] >> 16) & 65535; |
| 119 | 1 | equemene | res[c] &= 65535;
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| 120 | 1 | equemene | for (r = 0; r < c+1; ++r) { |
| 121 | 1 | equemene | res[c] = kk[r] * jj[c-r] + (res[c] & 65535);
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| 122 | 1 | equemene | res[c+1] += (res[c] >> 16) & 65535; |
| 123 | 1 | equemene | } |
| 124 | 1 | equemene | } |
| 125 | 1 | equemene | |
| 126 | 1 | equemene | for (c = 0; c < 2; ++c) |
| 127 | 1 | equemene | I[c] = (int)(((res[2*c+1] & 65535) << 16) | (res[2*c] & 65535)); |
| 128 | 1 | equemene | /*
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| 129 | 1 | equemene | * End of HPL_lmul
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| 130 | 1 | equemene | */
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| 131 | 1 | equemene | } |