root / testing / matgen / HPL_ladd.c
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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_ladd
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| 54 | 1 | equemene | ( |
| 55 | 1 | equemene | int * J,
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| 56 | 1 | equemene | int * K,
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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_ladd
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| 61 | 1 | equemene | ( J, K, I ) |
| 62 | 1 | equemene | int * J;
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| 63 | 1 | equemene | int * K;
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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_ladd adds without carry two long positive integers K and J and
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| 72 | 1 | equemene | * puts the result into I. The long integers I, J, K are encoded on 64
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| 73 | 1 | equemene | * 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
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| 75 | 1 | equemene | * entry.
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| 76 | 1 | equemene | *
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| 77 | 1 | equemene | * Arguments
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| 78 | 1 | equemene | * =========
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| 79 | 1 | equemene | *
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| 80 | 1 | equemene | * J (local input) int *
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| 81 | 1 | equemene | * On entry, J is an integer array of dimension 2 containing the
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| 82 | 1 | equemene | * encoded long integer J.
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| 83 | 1 | equemene | *
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| 84 | 1 | equemene | * K (local input) int *
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| 85 | 1 | equemene | * On entry, K is an integer array of dimension 2 containing the
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| 86 | 1 | equemene | * encoded long integer K.
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| 87 | 1 | equemene | *
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| 88 | 1 | equemene | * I (local output) int *
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| 89 | 1 | equemene | * On entry, I is an integer array of dimension 2. On exit, this
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| 90 | 1 | equemene | * array contains the encoded long integer result.
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| 91 | 1 | equemene | *
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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 | * .. Local Variables ..
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| 96 | 1 | equemene | */
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| 97 | 1 | equemene | unsigned int itmp0, itmp1; |
| 98 | 1 | equemene | unsigned int ktmp0 = K[0] & 65535, ktmp1 = (unsigned)K[0] >> 16; |
| 99 | 1 | equemene | unsigned int ktmp2 = K[1] & 65535, ktmp3 = (unsigned)K[1] >> 16; |
| 100 | 1 | equemene | unsigned int jtmp0 = J[0] & 65535, jtmp1 = (unsigned)J[0] >> 16; |
| 101 | 1 | equemene | unsigned int jtmp2 = J[1] & 65535, jtmp3 = (unsigned)J[1] >> 16; |
| 102 | 1 | equemene | |
| 103 | 1 | equemene | /* ..
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| 104 | 1 | equemene | * .. Executable Statements ..
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| 105 | 1 | equemene | */
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| 106 | 1 | equemene | /*
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| 107 | 1 | equemene | * K[1] K[0] K I[0] = (K[0]+J[0]) % 2^32
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| 108 | 1 | equemene | * XXXX XXXX carry = (K[0]+J[0]) / 2^32
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| 109 | 1 | equemene | *
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| 110 | 1 | equemene | * + J[1] J[0] J I[1] = K[1] + J[1] + carry
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| 111 | 1 | equemene | * XXXX XXXX I[1] = I[1] % 2^32
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| 112 | 1 | equemene | * -------------
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| 113 | 1 | equemene | * I[1] I[0]
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| 114 | 1 | equemene | * 0XXX XXXX I
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| 115 | 1 | equemene | */
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| 116 | 1 | equemene | itmp0 = ktmp0 + jtmp0; |
| 117 | 1 | equemene | itmp1 = itmp0 >> 16; I[0] = itmp0 - (itmp1 << 16 ); |
| 118 | 1 | equemene | itmp1 += ktmp1 + jtmp1; I[0] |= (itmp1 & 65535) << 16; |
| 119 | 1 | equemene | itmp0 = (itmp1 >> 16) + ktmp2 + jtmp2;
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| 120 | 1 | equemene | I[1] = itmp0 - ((itmp0 >> 16 ) << 16); |
| 121 | 1 | equemene | itmp1 = (itmp0 >> 16) + ktmp3 + jtmp3;
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| 122 | 1 | equemene | I[1] |= (itmp1 & 65535) << 16; |
| 123 | 1 | equemene | /*
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| 124 | 1 | equemene | * End of HPL_ladd
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| 125 | 1 | equemene | */
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| 126 | 1 | equemene | } |