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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 | /* * Linux/PA-RISC Project (http://www.parisc-linux.org/) * * Floating-point emulation code * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * BEGIN_DESC * * Purpose: * Single Floating-point Round to Integer * Double Floating-point Round to Integer * Quad Floating-point Round to Integer (returns unimplemented) * * External Interfaces: * dbl_frnd(srcptr,nullptr,dstptr,status) * sgl_frnd(srcptr,nullptr,dstptr,status) * * END_DESC */ #include "float.h" #include "sgl_float.h" #include "dbl_float.h" #include "cnv_float.h" /* * Single Floating-point Round to Integer */ /*ARGSUSED*/ int sgl_frnd(sgl_floating_point *srcptr, unsigned int *nullptr, sgl_floating_point *dstptr, unsigned int *status) { register unsigned int src, result; register int src_exponent; register boolean inexact = FALSE; src = *srcptr; /* * check source operand for NaN or infinity */ if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) { /* * is signaling NaN? */ if (Sgl_isone_signaling(src)) { /* trap if INVALIDTRAP enabled */ if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); /* make NaN quiet */ Set_invalidflag(); Sgl_set_quiet(src); } /* * return quiet NaN or infinity */ *dstptr = src; return(NOEXCEPTION); } /* * Need to round? */ if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) { *dstptr = src; return(NOEXCEPTION); } /* * Generate result */ if (src_exponent >= 0) { Sgl_clear_exponent_set_hidden(src); result = src; Sgl_rightshift(result,(SGL_P-1) - (src_exponent)); /* check for inexact */ if (Sgl_isinexact_to_fix(src,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) Sgl_increment(result); break; case ROUNDMINUS: if (Sgl_isone_sign(src)) Sgl_increment(result); break; case ROUNDNEAREST: if (Sgl_isone_roundbit(src,src_exponent)) if (Sgl_isone_stickybit(src,src_exponent) || (Sgl_isone_lowmantissa(result))) Sgl_increment(result); } } Sgl_leftshift(result,(SGL_P-1) - (src_exponent)); if (Sgl_isone_hiddenoverflow(result)) Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1)); else Sgl_set_exponent(result,src_exponent + SGL_BIAS); } else { result = src; /* set sign */ Sgl_setzero_exponentmantissa(result); /* check for inexact */ if (Sgl_isnotzero_exponentmantissa(src)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) Sgl_set_exponent(result,SGL_BIAS); break; case ROUNDMINUS: if (Sgl_isone_sign(src)) Sgl_set_exponent(result,SGL_BIAS); break; case ROUNDNEAREST: if (src_exponent == -1) if (Sgl_isnotzero_mantissa(src)) Sgl_set_exponent(result,SGL_BIAS); } } } *dstptr = result; if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); } /* * Double Floating-point Round to Integer */ /*ARGSUSED*/ int dbl_frnd( dbl_floating_point *srcptr, unsigned int *nullptr, dbl_floating_point *dstptr, unsigned int *status) { register unsigned int srcp1, srcp2, resultp1, resultp2; register int src_exponent; register boolean inexact = FALSE; Dbl_copyfromptr(srcptr,srcp1,srcp2); /* * check source operand for NaN or infinity */ if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) { /* * is signaling NaN? */ if (Dbl_isone_signaling(srcp1)) { /* trap if INVALIDTRAP enabled */ if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); /* make NaN quiet */ Set_invalidflag(); Dbl_set_quiet(srcp1); } /* * return quiet NaN or infinity */ Dbl_copytoptr(srcp1,srcp2,dstptr); return(NOEXCEPTION); } /* * Need to round? */ if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) { Dbl_copytoptr(srcp1,srcp2,dstptr); return(NOEXCEPTION); } /* * Generate result */ if (src_exponent >= 0) { Dbl_clear_exponent_set_hidden(srcp1); resultp1 = srcp1; resultp2 = srcp2; Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); /* check for inexact */ if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) Dbl_increment(resultp1,resultp2); break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) Dbl_increment(resultp1,resultp2); break; case ROUNDNEAREST: if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) || (Dbl_isone_lowmantissap2(resultp2))) Dbl_increment(resultp1,resultp2); } } Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); if (Dbl_isone_hiddenoverflow(resultp1)) Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1)); else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS); } else { resultp1 = srcp1; /* set sign */ Dbl_setzero_exponentmantissa(resultp1,resultp2); /* check for inexact */ if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) Dbl_set_exponent(resultp1,DBL_BIAS); break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) Dbl_set_exponent(resultp1,DBL_BIAS); break; case ROUNDNEAREST: if (src_exponent == -1) if (Dbl_isnotzero_mantissa(srcp1,srcp2)) Dbl_set_exponent(resultp1,DBL_BIAS); } } } Dbl_copytoptr(resultp1,resultp2,dstptr); if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); } |