mirror of https://gitee.com/openkylin/linux.git
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
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/*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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*
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* Floating-point emulation code
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* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* BEGIN_DESC
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*
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* File:
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* @(#) pa/fp/denormal.c $ Revision: $
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*
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* Purpose:
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* <<please update with a synopsis of the functionality provided by this file>>
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*
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* External Interfaces:
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* <<the following list was autogenerated, please review>>
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* dbl_denormalize(dbl_opndp1,dbl_opndp2,inexactflag,rmode)
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* sgl_denormalize(sgl_opnd,inexactflag,rmode)
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*
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* Internal Interfaces:
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* <<please update>>
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*
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* Theory:
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* <<please update with a overview of the operation of this file>>
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*
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* END_DESC
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*/
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#include "float.h"
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#include "sgl_float.h"
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#include "dbl_float.h"
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#include "hppa.h"
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#include <linux/kernel.h>
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/* #include <machine/sys/mdep_private.h> */
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#undef Fpustatus_register
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#define Fpustatus_register Fpu_register[0]
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void
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sgl_denormalize(unsigned int *sgl_opnd, boolean *inexactflag, int rmode)
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{
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unsigned int opnd;
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int sign, exponent;
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boolean guardbit = FALSE, stickybit, inexact;
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opnd = *sgl_opnd;
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stickybit = *inexactflag;
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exponent = Sgl_exponent(opnd) - SGL_WRAP;
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sign = Sgl_sign(opnd);
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Sgl_denormalize(opnd,exponent,guardbit,stickybit,inexact);
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if (inexact) {
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switch (rmode) {
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case ROUNDPLUS:
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if (sign == 0) {
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Sgl_increment(opnd);
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}
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break;
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case ROUNDMINUS:
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if (sign != 0) {
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Sgl_increment(opnd);
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}
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break;
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case ROUNDNEAREST:
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if (guardbit && (stickybit ||
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Sgl_isone_lowmantissa(opnd))) {
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Sgl_increment(opnd);
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}
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break;
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}
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}
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Sgl_set_sign(opnd,sign);
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*sgl_opnd = opnd;
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*inexactflag = inexact;
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return;
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}
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void
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dbl_denormalize(unsigned int *dbl_opndp1,
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unsigned int * dbl_opndp2,
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boolean *inexactflag,
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int rmode)
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{
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unsigned int opndp1, opndp2;
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int sign, exponent;
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boolean guardbit = FALSE, stickybit, inexact;
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opndp1 = *dbl_opndp1;
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opndp2 = *dbl_opndp2;
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stickybit = *inexactflag;
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exponent = Dbl_exponent(opndp1) - DBL_WRAP;
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sign = Dbl_sign(opndp1);
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Dbl_denormalize(opndp1,opndp2,exponent,guardbit,stickybit,inexact);
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if (inexact) {
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switch (rmode) {
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case ROUNDPLUS:
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if (sign == 0) {
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Dbl_increment(opndp1,opndp2);
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}
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break;
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case ROUNDMINUS:
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if (sign != 0) {
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Dbl_increment(opndp1,opndp2);
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}
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break;
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case ROUNDNEAREST:
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if (guardbit && (stickybit ||
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Dbl_isone_lowmantissap2(opndp2))) {
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Dbl_increment(opndp1,opndp2);
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}
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break;
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}
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}
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Dbl_set_sign(opndp1,sign);
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*dbl_opndp1 = opndp1;
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*dbl_opndp2 = opndp2;
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*inexactflag = inexact;
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return;
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}
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