<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> <title>poly_fct.c Source File</title> <link href="doxygen.css" rel="stylesheet" type="text/css"> </head><body> <!-- Generated by Doxygen 1.2.15 --> <center> <a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="annotated.html">Data Structures</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Data Fields</a> <a class="qindex" href="globals.html">Globals</a> </center> <hr><h1>poly_fct.c</h1><div class="fragment"><pre>00001 <font class="comment">/*</font> 00002 <font class="comment"> * Author : Defour David</font> 00003 <font class="comment"> * Contact : David.Defour@ens-lyon.fr</font> 00004 <font class="comment"> *</font> 00005 <font class="comment"> * This program is free software; you can redistribute it and/or modify</font> 00006 <font class="comment"> * it under the terms of the GNU Lesser General Public License as published by</font> 00007 <font class="comment"> * the Free Software Foundation; either version 2 of the License, or </font> 00008 <font class="comment"> * (at your option) any later version.</font> 00009 <font class="comment"> * </font> 00010 <font class="comment"> * This program is distributed in the hope that it will be useful,</font> 00011 <font class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</font> 00012 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</font> 00013 <font class="comment"> * GNU General Public License for more details.</font> 00014 <font class="comment"> *</font> 00015 <font class="comment"> * You should have received a copy of the GNU Lesser General Public License</font> 00016 <font class="comment"> * along with this program; if not, write to the Free Software</font> 00017 <font class="comment"> * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. </font> 00018 <font class="comment"> */</font> 00019 <font class="preprocessor">#include "<a class="code" href="scs_8h.html">scs.h</a>"</font> 00020 <font class="preprocessor">#include "<a class="code" href="scs__private_8h.html">scs_private.h</a>"</font> 00021 00022 00023 <font class="comment">/*</font> 00024 <font class="comment"> * result = z + (x * y)</font> 00025 <font class="comment"> */</font> 00026 <font class="comment">/* z->sign = X_SGN . Y_SGN */</font> 00027 <font class="keywordtype">void</font> scs_fma(<a class="code" href="structscs.html">scs_ptr</a> result, <a class="code" href="structscs.html">scs_ptr</a> x, <a class="code" href="structscs.html">scs_ptr</a> y, <a class="code" href="structscs.html">scs_ptr</a> z){ 00028 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> <font class="keywordtype">long</font> <font class="keywordtype">int</font> RES[2*SCS_NB_WORDS]; 00029 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> <font class="keywordtype">long</font> <font class="keywordtype">int</font> val, tmp; 00030 <font class="keywordtype">int</font> i, j, ind, Diff; 00031 00032 ind = X_IND + Y_IND; 00033 00034 <font class="keywordflow">for</font>(i=0; i<=SCS_NB_WORDS+1; i++) 00035 RES[i]=0; 00036 00037 <font class="keywordflow">for</font>(i=0 ; i<SCS_NB_WORDS; i++){ 00038 <font class="keywordflow">for</font>(j=0; j<(SCS_NB_WORDS-i); j++){ 00039 RES[i+j] += (<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> <font class="keywordtype">long</font> <font class="keywordtype">int</font>)X_HW[i] * Y_HW[j]; 00040 }} 00041 00042 <font class="comment">/* if we can perform an add */</font> 00043 <font class="keywordflow">if</font> (z-><a class="code" href="structscs.html#m3">sign</a> == (X_SGN * Y_SGN)){ 00044 Diff = z-><a class="code" href="structscs.html#m2">index</a> - ind; 00045 <font class="keywordflow">if</font> (Diff >= 0){ 00046 <font class="keywordflow">for</font>(i=(SCS_NB_WORDS-1), j=(SCS_NB_WORDS-Diff); j>=0; i--, j--) 00047 RES[i] = z-><a class="code" href="structscs.html#m0">h_word</a>[i] + RES[j]; 00048 <font class="keywordflow">for</font>( ; i>=0; i--) 00049 RES[i] = z-><a class="code" href="structscs.html#m0">h_word</a>[i]; 00050 }<font class="keywordflow">else</font> { 00051 <font class="keywordflow">for</font>(i=(SCS_NB_WORDS+Diff), j=(SCS_NB_WORDS-1); i>=0; i--, j--) 00052 RES[j] = z-><a class="code" href="structscs.html#m0">h_word</a>[i] + RES[j]; 00053 } 00054 00055 <font class="comment">/* Carry propagate */</font> 00056 RES[SCS_NB_WORDS-1] += (RES[SCS_NB_WORDS]>>SCS_NB_BITS); 00057 <font class="keywordflow">for</font>(i=(SCS_NB_WORDS-1); i>0; i--) 00058 {tmp = RES[i]>>SCS_NB_BITS; RES[i-1] += tmp; RES[i] -= (tmp<<SCS_NB_BITS);} 00059 00060 val = RES[0] >> SCS_NB_BITS; 00061 R_IND = X_IND + Y_IND; 00062 00063 <font class="comment">/* Store the result */</font> 00064 <font class="keywordflow">if</font>(val != 0){ 00065 <font class="comment">/* shift all the digits ! */</font> 00066 R_HW[0] = val; 00067 R_HW[1] = RES[0] - (val<<SCS_NB_BITS); 00068 <font class="keywordflow">for</font>(i=2; i<SCS_NB_WORDS; i++) 00069 R_HW[i] = RES[i-1]; 00070 00071 R_IND += 1; 00072 } 00073 <font class="keywordflow">else</font> { 00074 <font class="keywordflow">for</font>(i=0; i<SCS_NB_WORDS; i++) 00075 R_HW[i] = RES[i]; 00076 } 00077 00078 R_EXP = (z-><a class="code" href="structscs.html#m1">exception</a>.d + (X_EXP * Y_EXP)) - 1; 00079 R_SGN = X_SGN * Y_SGN; 00080 00081 }<font class="keywordflow">else</font> { 00082 <font class="comment">/* we have to do a sub */</font> 00083 00084 <font class="comment">/* Carry propagate */</font> 00085 RES[SCS_NB_WORDS-1] += (RES[SCS_NB_WORDS]>>SCS_NB_BITS); 00086 <font class="keywordflow">for</font>(i=(SCS_NB_WORDS-1); i>0; i--) 00087 {tmp = RES[i]>>SCS_NB_BITS; RES[i-1] += tmp; RES[i] -= (tmp<<SCS_NB_BITS);} 00088 00089 val = RES[0] >> SCS_NB_BITS; 00090 R_IND = X_IND + Y_IND; 00091 00092 <font class="comment">/* Store the result */</font> 00093 <font class="keywordflow">if</font>(val != 0){ 00094 <font class="comment">/* shift all the digits ! */</font> 00095 R_HW[0] = val; 00096 R_HW[1] = RES[0] - (val<<SCS_NB_BITS); 00097 <font class="keywordflow">for</font>(i=2; i<SCS_NB_WORDS; i++) 00098 R_HW[i] = RES[i-1]; 00099 00100 R_IND += 1; 00101 } 00102 <font class="keywordflow">else</font> { 00103 <font class="keywordflow">for</font>(i=0; i<SCS_NB_WORDS; i++) 00104 R_HW[i] = RES[i]; 00105 } 00106 00107 R_EXP = (X_EXP * Y_EXP); 00108 R_SGN = X_SGN * Y_SGN; 00109 00110 <a class="code" href="addition__scs_8c.html#a8">scs_add</a>(result, result, z); 00111 } 00112 } </pre></div><hr><address align="right"><small>Generated on Tue Jun 17 10:15:51 2003 for SCSLib by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border=0 width=110 height=53></a>1.2.15 </small></address> </body> </html>