From: "Paul Edwards" <mutazilah@gmail.com>
To: "Ulrich Weigand" <uweigand@de.ibm.com>
Cc: "Daniel Jacobowitz" <drow@false.org>, <gcc@gcc.gnu.org>
Subject: Re: i370 port
Date: Sat, 08 Aug 2009 12:04:00 -0000 [thread overview]
Message-ID: <F46C4F5791D94FA1B4496CCF057B73FF@Paullaptop> (raw)
In-Reply-To: <200907201426.n6KEQwOf024382@d12av02.megacenter.de.ibm.com>
>> I then found out that even with old versions of the machine definition,
>> I can have the warning removed by simply not defining CONST_INT
>> in the PREDICATE_CODES, even though it is allowed when the
>> function is called. ie it seems to have no effect on the code
>> generation, but succeeds in eliminating the warning, and without
>> needing to define an extra constraint for non-constant situations.
>
> Actually PREDICATE_CODES does have to match the predicate definitions.
> If it does not, you can run into subtle bugs, as the code in genrecog.c
> that generates the finite state automaton matching an RTX pattern
> against the .md insn definitions *does* make use of PREDICATE_CODES;
> for example, it will assume that two predicates with disjoint sets
> of PREDICATE_CODES can never both match the same RTX.
>
> This may or may not lead to visible differences when compiling simple
> test cases, but I'd expect effects to be visible in more complex
> scenarios.
Thanks Ulrich. When I went back to this I found that I had
misdiagnosed - actually the r_or_s didn't allow constants after
all. It was only const_rtx that it allowed. So the machine definition
no longer has any warnings and all looks good.
That's with 3.2.3.
With 3.4.6 I have now managed to get an MVS load module,
unoptimized (I already know that optimized doesn't work), to
compile a hello world program successfully, although it abends
at the end of that and I haven't investigated that yet.
So the theoretical EBCDIC support is less theoretical now.
I "needed" to change the parameter search algorithm to stop
being binary search though.
GCC 4 complained (on my Linux system) that I didn't have
various things (gimp etc) installed, which means I would need
that other software to be ported too, which is not a project
I want to work on at the moment. However, at least it means
that i have successfully merged all the GCCMVS changes
to 3.2.3 in with the (last available) 3.4.6 development, which
was a precursor to any GCC 4 port anyway. I'll see over time
how GCC 3.4.6 pans out.
Until then, back at GCC 3.2.3, I have a "need" to make the entry
point 0 in my MVS modules.
Currently I generate this:
COPY PDPTOP
CSECT
* X-var bytes
ENTRY BYTES
* Program data area
DS 0F
BYTES EQU *
DC F'258'
* Program text area
LC0 EQU *
DC C'bytes is %d'
DC X'15'
DC X'0'
DS 0F
DC C'GCCMVS!!'
EXTRN @@CRT0
ENTRY @@MAIN
@@MAIN DS 0H
USING *,15
L 15,=V(@@CRT0)
BR 15
DROP 15
LTORG
* X-func main prologue
MAIN PDPPRLG CINDEX=0,FRAME=96,BASER=12,ENTRY=YES
...
* Function main page table
DS 0F
PGT0 EQU *
DC A(PG0)
END @@MAIN
for a main program. In order to get the entry point to 0, I need to move
that
@@MAIN function to the top of the file.
But I only really want that function if this is a main program. I have
found
somewhere where I can add some code to see if the function "main" is
being compiled, and set a global variable.
Unfortunately, the place that happens (c-decl) isn't called until after all
the data has been written out!
I looked at the documentation:
http://gcc.gnu.org/onlinedocs/gcc-3.2.3/gccint/Assembler-Format.html#Assembler%20Format
but maybe I'm looking in the wrong place. Any ideas?
And I have another question - where is the code for __asm__?
Currently that is generating garbage for me:
unsigned int bytes = 258;
__asm__("? :");
int main(void)
BYTES EQU *
DC F'258'
o@z
* Program text area
when done in cross-compiler mode, and need to find out where
the literal is being translated (or more likely - failing to be
translated in the first instance). Any idea where that is?
And final thing - the interest in the __asm__ comes from the hope
that in the generated 370 assembler, it would be possible to have
the C code interspersed to whatever extent possible. The plan was
to basically somehow get every line of C code, e.g. "int main(void)"
above, and automatically generate an:
__asm__("int main void)");
although I'm not sure what to do about this:
int main(void)
__asm__("? :");
{
which gives a syntax error. Any idea how to get the mixed
C/assembler when I'm running with the "-S" option and don't
have the luxury of calling the normal "as" which would
normally handle that?
Thanks. Paul.
next prev parent reply other threads:[~2009-08-08 11:01 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-05 12:45 Paul Edwards
2009-06-05 14:33 ` Joseph S. Myers
2009-06-05 14:57 ` Paul Edwards
2009-06-05 15:03 ` Joseph S. Myers
2009-06-05 15:24 ` Paul Edwards
2009-06-05 15:47 ` Joseph S. Myers
2009-09-11 17:35 ` i370 port - in search of hooks Paul Edwards
2017-03-31 10:34 ` i370 port Paul Edwards
2009-09-12 12:41 ` Paul Edwards
2009-06-05 15:21 ` Ulrich Weigand
2009-06-05 15:39 ` Paul Edwards
2009-06-05 15:49 ` Daniel Jacobowitz
2009-06-05 15:57 ` Paul Edwards
2009-06-05 20:20 ` Joseph S. Myers
2009-06-05 20:45 ` Paul Edwards
2009-06-06 15:00 ` Paul Edwards
2009-06-15 17:46 ` Ulrich Weigand
2009-06-19 0:06 ` Paul Edwards
2009-06-19 12:28 ` Ulrich Weigand
2009-07-18 11:28 ` Paul Edwards
2009-07-20 14:27 ` Ulrich Weigand
2009-08-08 12:04 ` Paul Edwards [this message]
2009-08-10 21:25 ` Ulrich Weigand
2009-08-11 0:34 ` Paul Edwards
2009-08-11 15:21 ` Ulrich Weigand
2009-08-12 11:52 ` Paul Edwards
2009-08-12 15:27 ` Paolo Bonzini
2009-08-12 16:35 ` Ulrich Weigand
2009-08-12 17:27 ` Paul Edwards
2009-08-12 17:56 ` Paolo Bonzini
2009-08-12 19:46 ` Ulrich Weigand
2009-08-12 20:31 ` Paul Edwards
2009-08-19 12:07 ` Paul Edwards
2009-08-19 12:27 ` Paolo Bonzini
2009-08-20 12:49 ` Paul Edwards
2009-08-20 22:48 ` Ulrich Weigand
2009-08-21 2:37 ` Paul Edwards
2009-08-21 16:46 ` Ulrich Weigand
2009-06-05 15:44 ` Joseph S. Myers
2009-06-05 15:52 ` Paul Edwards
2009-09-08 15:55 ` Paul Edwards
2009-09-14 15:32 ` Ulrich Weigand
2021-09-02 8:15 ` s390 port Paul Edwards
2021-09-02 14:34 ` Ulrich Weigand
2021-09-02 14:50 ` Paul Edwards
2021-09-02 14:53 ` Ulrich Weigand
2021-09-02 15:01 ` Paul Edwards
2021-09-02 15:13 ` Ulrich Weigand
2021-09-02 15:26 ` Paul Edwards
2021-09-02 19:46 ` Ulrich Weigand
2021-09-02 20:05 ` Paul Edwards
2021-09-02 20:16 ` Andreas Schwab
2021-09-03 11:18 ` Ulrich Weigand
2021-09-03 11:35 ` Paul Edwards
2021-09-03 12:12 ` Ulrich Weigand
2021-09-03 12:38 ` Paul Edwards
2021-09-03 12:53 ` Jakub Jelinek
2021-09-03 13:12 ` Paul Edwards
2022-12-20 4:27 ` Paul Edwards
2009-08-23 8:50 i370 port Paul Edwards
2009-08-26 22:13 ` Henrik Sorensen
2009-09-09 22:33 Paul Edwards
2009-09-14 15:42 ` Ulrich Weigand
2009-09-15 12:59 ` Paul Edwards
2009-09-15 13:51 ` Ulrich Weigand
2009-09-17 13:00 ` Paul Edwards
2009-09-17 17:55 ` Ulrich Weigand
2009-09-18 0:35 ` Paul Edwards
2009-09-18 12:06 ` Ulrich Weigand
2009-09-18 12:23 ` Paul Edwards
2009-09-18 13:27 ` Ulrich Weigand
2009-09-18 13:42 ` Paul Edwards
2009-09-18 16:08 ` Ulrich Weigand
2009-09-19 12:57 ` Paul Edwards
2009-09-25 10:19 ` Paul Edwards
2009-09-25 15:20 ` Ulrich Weigand
2009-11-04 5:21 ` Paul Edwards
2009-11-04 16:47 ` Ulrich Weigand
2009-11-09 14:55 ` Paul Edwards
2009-11-09 15:57 ` Ian Lance Taylor
2009-11-09 23:10 ` Paul Edwards
2009-11-10 14:58 ` Paul Edwards
2009-11-10 15:36 ` Ian Lance Taylor
2009-11-10 15:51 ` Paul Edwards
2009-11-10 15:56 ` Ian Lance Taylor
2009-12-02 22:03 ` Paul Edwards
2011-08-13 8:34 ` Paul Edwards
2011-08-15 14:32 ` Ulrich Weigand
2011-08-15 15:26 ` Paul Edwards
2011-08-15 17:23 ` Ulrich Weigand
2011-08-16 11:20 ` Paul Edwards
2011-08-16 13:26 ` Ulrich Weigand
2011-08-18 12:15 ` Paul Edwards
2011-08-18 13:14 ` Ulrich Weigand
2011-08-18 14:18 ` Paul Edwards
2009-09-22 12:31 Paul Edwards
2011-08-20 7:44 Paul Edwards
2011-08-20 10:09 Paul Edwards
2011-08-20 12:15 Paul Edwards
2011-08-22 12:23 ` Ulrich Weigand
2012-04-05 13:32 ` Paul Edwards
2012-04-06 18:13 ` Ulrich Weigand
2012-04-06 5:51 Paul Edwards
2012-04-06 12:49 Paul Edwards
2012-04-06 18:16 ` Ulrich Weigand
2012-04-07 4:12 ` Paul Edwards
2012-04-07 5:45 Paul Edwards
2012-04-08 17:43 ` Ulrich Weigand
2014-02-11 17:01 ` Paul Edwards
2014-02-13 4:23 Paul Edwards
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