On Saturday, June 18, 2011, Andrew Johnson wrote:
> Hi Michael,
>
> On 2011-06-17 Michael Davidsaver wrote:
> > I'd like to add a standard 64-bit integer type to epicsTypes.h.
> > Currently this is only available when compiling with the C99 extensions
> > enabled.
> >
> > Attached are two proposed patches. The first adds sanity checks of the
> > existing type sizes. The second defines epicsUInt64 and epicsInt64.
> >
> > The C primitive used (either long or long long) is chosen by testing
> > the size of LONG_MAX. I think this should work for all toolchains
> > which actually provide a 64-bit integer type. The question is, are
> > there any which don't and need to be supported?
>
> There were issues with using long long on some vxWorks
> versions/architectures, although from what I can see they were only in
> vxWorks 5.3.x releases and the later releases apparently do provide full
> support. I believe there were some support routines that gcc calls
> implicitly which the OS relegated to an external libgcc.a library rather
> than building them into the OS image.
VxWorks 5.4.2 (or rather, the glibc shipped with it) does not fully support
64 bit integers on mv162. I needed division and modulo at some time and got
linker errors about missing __div64 etc functions. So I just copied the
attached file from some glibc version to the support module that needed the
operations and this stuff is running on our mv162 ever since w/o problems.
Cheers
Ben
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#if 0
/* __div64:
Division of signed long long 's
Contributed by Gert Ohme ([email protected])
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
long long __div64(long long x, long long y)
{
unsigned long long a = (x < 0) ? -x : x;
unsigned long long b = (y < 0) ? -y : y;
unsigned long long res = 0, d = 1;
if (b > 0)
while (b < a)
b <<= 1, d <<= 1;
do {
if (a >= b)
a -= b, res += d;
b >>= 1;
d >>= 1;
} while (d);
return (((x ^ y) & (1ll << 63)) == 0) ? res : -(long long)res;
}
/* __rem64:
Remainder of a division of signed long long 's
Contributed by Gert Ohme ([email protected])
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
long long __rem64(long long x, long long y)
{
unsigned long long a = (x < 0) ? -x : x;
unsigned long long b = (y < 0) ? -y : y;
unsigned long long d = 1;
if (b > 0)
while (b < a)
b <<= 1, d <<= 1;
do {
if (a >= b)
a -= b;
b >>= 1;
d >>= 1;
} while (d);
return ((x & (1ll << 63)) == 0) ? a : -(long long)a;
}
#endif
/* __udivdi3:
Division of unsigned long long 's
Contributed by Gert Ohme ([email protected])
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
unsigned long long __udivdi3(unsigned long long x, unsigned long long y)
{
unsigned long long res = 0, d = 1;
unsigned long long e = 1ll << 63;
if (x == 0)
return (0);
while ((x & e) == 0)
e >>= 1;
if (y > 0)
while (y < e)
y <<= 1, d <<= 1;
do {
if (x >= y)
x -= y, res += d;
y >>= 1;
d >>= 1;
} while (d);
return res;
}
/* __umoddi3:
Remainder of a division of unsigned long long 's
Contributed by Gert Ohme ([email protected])
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
unsigned long long __umoddi3(unsigned long long x, unsigned long long y)
{
unsigned long long d = 1;
unsigned long long e = 1ll << 63;
if (x == 0)
return (0);
while ((x & e) == 0)
e >>= 1;
if (y > 0)
while (y < e)
y <<= 1, d <<= 1;
do {
if (x >= y)
x -= y;
y >>= 1;
d >>= 1;
} while (d);
return x;
}
- References:
- 64 bit integers (aka. long or long long) Michael Davidsaver
- Re: 64 bit integers (aka. long or long long) Andrew Johnson
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