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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 | /* * 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 * * File: * @(#) pa/fp/denormal.c $ Revision: $ * * Purpose: * <<please update with a synopsis of the functionality provided by this file>> * * External Interfaces: * <<the following list was autogenerated, please review>> * dbl_denormalize(dbl_opndp1,dbl_opndp2,inexactflag,rmode) * sgl_denormalize(sgl_opnd,inexactflag,rmode) * * Internal Interfaces: * <<please update>> * * Theory: * <<please update with a overview of the operation of this file>> * * END_DESC */ #include "float.h" #include "sgl_float.h" #include "dbl_float.h" #include "hppa.h" #include <linux/kernel.h> /* #include <machine/sys/mdep_private.h> */ #undef Fpustatus_register #define Fpustatus_register Fpu_register[0] void sgl_denormalize(unsigned int *sgl_opnd, boolean *inexactflag, int rmode) { unsigned int opnd; int sign, exponent; boolean guardbit = FALSE, stickybit, inexact; opnd = *sgl_opnd; stickybit = *inexactflag; exponent = Sgl_exponent(opnd) - SGL_WRAP; sign = Sgl_sign(opnd); Sgl_denormalize(opnd,exponent,guardbit,stickybit,inexact); if (inexact) { switch (rmode) { case ROUNDPLUS: if (sign == 0) { Sgl_increment(opnd); } break; case ROUNDMINUS: if (sign != 0) { Sgl_increment(opnd); } break; case ROUNDNEAREST: if (guardbit && (stickybit || Sgl_isone_lowmantissa(opnd))) { Sgl_increment(opnd); } break; } } Sgl_set_sign(opnd,sign); *sgl_opnd = opnd; *inexactflag = inexact; return; } void dbl_denormalize(unsigned int *dbl_opndp1, unsigned int * dbl_opndp2, boolean *inexactflag, int rmode) { unsigned int opndp1, opndp2; int sign, exponent; boolean guardbit = FALSE, stickybit, inexact; opndp1 = *dbl_opndp1; opndp2 = *dbl_opndp2; stickybit = *inexactflag; exponent = Dbl_exponent(opndp1) - DBL_WRAP; sign = Dbl_sign(opndp1); Dbl_denormalize(opndp1,opndp2,exponent,guardbit,stickybit,inexact); if (inexact) { switch (rmode) { case ROUNDPLUS: if (sign == 0) { Dbl_increment(opndp1,opndp2); } break; case ROUNDMINUS: if (sign != 0) { Dbl_increment(opndp1,opndp2); } break; case ROUNDNEAREST: if (guardbit && (stickybit || Dbl_isone_lowmantissap2(opndp2))) { Dbl_increment(opndp1,opndp2); } break; } } Dbl_set_sign(opndp1,sign); *dbl_opndp1 = opndp1; *dbl_opndp2 = opndp2; *inexactflag = inexact; return; } |