This is a revision of a patch I proposed a while back, to add udivhi3 and
umodhi3 functions to libgcc since some platforms (like pdp11) need it. The
code is adopted from that of udivsi3.
In earlier discussion it was pointed out that internal functions need to start
with __. The code I had copied does not do that, so I corrected mine and also
changed the existing code to conform to the rules.
Ok for trunk?
paul
ChangeLog:
2018-10-17 Paul Koning <n...@arrl.net>
* udivmodsi4.c (__udivmodsi4): Rename to conform to coding
standard.
* udivmod.c: Update references to __udivmodsi4.
* udivhi3.c: New file.
* udivmodhi4.c: New file.
* config/pdp11/t-pdp11 (LIB2ADD): Add the new files.
Index: config/pdp11/t-pdp11
===================================================================
--- config/pdp11/t-pdp11 (revision 265151)
+++ config/pdp11/t-pdp11 (working copy)
@@ -1,5 +1,7 @@
LIB2ADD = $(srcdir)/udivmod.c \
$(srcdir)/udivmodsi4.c \
+ $(srcdir)/udivhi3.c \
+ $(srcdir)/udivmodhi4.c \
$(srcdir)/memcmp.c \
$(srcdir)/memcpy.c \
$(srcdir)/memmove.c \
Index: udivhi3.c
===================================================================
--- udivhi3.c (nonexistent)
+++ udivhi3.c (working copy)
@@ -0,0 +1,38 @@
+/* Copyright (C) 2000-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+extern unsigned short __udivmodhi4(unsigned short num, unsigned short den,
+ int
modwanted);
+
+unsigned short
+__udivhi3 (unsigned short a, unsigned short b)
+{
+ return __udivmodhi4 (a, b, 0);
+}
+
+unsigned short
+__umodhi3 (unsigned short a, unsigned short b)
+{
+ return __udivmodhi4 (a, b, 1);
+}
+
Index: udivmod.c
===================================================================
--- udivmod.c (revision 265151)
+++ udivmod.c (working copy)
@@ -21,17 +21,18 @@ a copy of the GCC Runtime Library Exception along
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
-long udivmodsi4 ();
+extern unsigned long __udivmodsi4(unsigned long num, unsigned long den,
+ int
modwanted);
long
__udivsi3 (long a, long b)
{
- return udivmodsi4 (a, b, 0);
+ return __udivmodsi4 (a, b, 0);
}
long
__umodsi3 (long a, long b)
{
- return udivmodsi4 (a, b, 1);
+ return __udivmodsi4 (a, b, 1);
}
Index: udivmodhi4.c
===================================================================
--- udivmodhi4.c (nonexistent)
+++ udivmodhi4.c (working copy)
@@ -0,0 +1,47 @@
+/* Copyright (C) 2000-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+unsigned short
+__udivmodhi4(unsigned short num, unsigned short den, int modwanted)
+{
+ unsigned short bit = 1;
+ unsigned short res = 0;
+
+ while (den < num && bit && !(den & (1L<<31)))
+ {
+ den <<=1;
+ bit <<=1;
+ }
+ while (bit)
+ {
+ if (num >= den)
+ {
+ num -= den;
+ res |= bit;
+ }
+ bit >>=1;
+ den >>=1;
+ }
+ if (modwanted) return num;
+ return res;
+}
Index: udivmodsi4.c
===================================================================
--- udivmodsi4.c (revision 265151)
+++ udivmodsi4.c (working copy)
@@ -22,7 +22,7 @@ see the files COPYING3 and COPYING.RUNTIME respect
<http://www.gnu.org/licenses/>. */
unsigned long
-udivmodsi4(unsigned long num, unsigned long den, int modwanted)
+__udivmodsi4(unsigned long num, unsigned long den, int modwanted)
{
unsigned long bit = 1;
unsigned long res = 0;
