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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/parisc/math-emu/denormal.c
Initial import
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+/*
+ * 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;
+}