patch-2.4.20 linux-2.4.20/arch/parisc/math-emu/denormal.c

• Lines: 136
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/parisc/math-emu/denormal.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/parisc/math-emu/denormal.c linux-2.4.20/arch/parisc/math-emu/denormal.c
@@ -0,0 +1,135 @@
+/*
+ * 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., 675 Mass Ave, Cambridge, MA 02139, 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 "types.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;
+}