On Fri, Nov 17, 2006 at 04:30:53PM -0700, Shaun Jackman wrote:
> The following macro expands to some rather frightful code on the AVR:
>
> #define BSWAP_16(x) \
> x) >> 8) & 0xff) | (((x) & 0xff) << 8))
[snip]
>
> Ideally, this macro would expand to three mov instructions and a ret.
> Is
Hi there
i have went through some of the GIMPLE stuff (mostly went through the GCCSummit
2003 paper). I think i have some reservations on the structure and semantics
of GIMPLE. Most of my compiler experience comes from interactions with the
SUIF2/MachSUIF2 infrastructure ; admittedly Machine-SUIF
a a. Conditional jumps in GIMPLE are not true three-address-code since they
specify two (2) branch targets (in their general form). E.g.:
if (cond) then
goto target1;
else
goto target2;
IMHO, this should be split (or at least made splittable) into:
if (cond) then
goto target1;
if (!cond)
> Ideally, this macro would expand to three mov instructions and a ret.
> Is there anything I can do to help GCC along here? I'm using GCC 4.1.0
> with -O2.
>
> I won't bother to show bswap_32 here, which produces a real disaster!
> Think 47 instructions, for what should be 6.
Use gcc head, __buil
Snapshot gcc-4.3-20061118 is now available on
ftp://gcc.gnu.org/pub/gcc/snapshots/4.3-20061118/
and on various mirrors, see http://gcc.gnu.org/mirrors.html for details.
This snapshot has been generated from the GCC 4.3 SVN branch
with the following options: svn://gcc.gnu.org/svn/gcc/trunk
The GCC build (svn revision 118976) is not finding the target as,
although it appears to be in the right place.
Thanks,
Shaun
$ ../configure --target=avr --enable-languages=c --prefix=/usr
...
$ cat gcc/as
#!/bin/sh
exec "$@"
$ /usr/bin/avr-as --version | head -1
GNU assembler 2.16.1
$ make
...
Hi Zdenek, all,
I'm running into some troubles with an if-conversion pass that runs
after reload, where we have to avoid lifting insns across a loop
exit edge into a loop. ifcvt.c uses flow_loops_find to find loops
and mark all loop exit edges:
if ((! targetm.cannot_modify_jumps_p ())
&&
On 11/18/06, Steven Bosscher <[EMAIL PROTECTED]> wrote:
Hi Zdenek, all,
Is this something that could be easily fixed? E.g. can we make it
that flow_loops_find only performs transformations if asked to (by
adding a function argument for that)?
Why not have a flow_canonicalize_loops that does
In the wake of PR28209 ([G]OMP environment variables undocumented), I came
across libgomp/NOTES:
"Notes on the external ABI presented by libgomp. This ought to get
transformed into proper documentation at some point."
Would a 1:1 transcription to texinfo suffice for the moment being?
E.g. some
> a a. Conditional jumps in GIMPLE are not true three-address-code since they
> > specify two (2) branch targets (in their general form). E.g.:
> >
> > if (cond) then
> > goto target1;
> > else
> > goto target2;
> >
> > IMHO, this should be split (or at least made splittable) into:
> >
> > if (
Sorry, but our NetCat (he he) ate part of my previous e-mail. She (yep it's a
she) lives in our mail server...
Here's what was left out...
> > b. Are LOOP_EXPRs decomposable to combinations of if-then-else and gotos?
> It
> > would help for VM (virtual machine) execution of GIMPLE IR. Ideally, a
On Sun, 2006-11-19 at 05:57 +0200, [EMAIL PROTECTED] wrote:
> > Errr, LOOP_EXPR doesn't actually exist anymore :)
> > Loops are always lowered to if-then-else and gotos.
>
> That's nice! I'll check on how things are handled now. Is this true for latest
> release, mainline - current gcc trunk, or g
> -Original Message-
> From:
> [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> org] On Behalf Of Paul Brook
> Sent: Saturday, November 18, 2006 9:46 AM
> To: gcc@gcc.gnu.org; Shaun Jackman
> Cc: avr-gcc-list@nongnu.org
> Subject: [avr-gcc-list] Re: AVR byte swap optimization
>
> > Ide
On Fri, 2006-11-17 at 22:19 -0500, Daniel Berlin wrote:
> On 11/17/06, Andrew MacLeod <[EMAIL PROTECTED]> wrote:
> > On Fri, 2006-11-17 at 12:22 -0500, Andrew MacLeod wrote:
> > > I just tried compiling cplusplus_grammer.ii with mainline, checking
> > > disabled, and had to stop it after 30 minutes
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