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Re: Parallel execution
I could not make these options work, they do not produce any output --neither to
the stdout, nor to a file. I tried in different machines with different versions
of gcc. Do you have any idea what the problem could be?
Thanks.
----- Original Message ----
From: Ian Lance Taylor <iant@google.com>
To: Hasan MUTLU <bigpatboy@yahoo.com>
Cc: gcc-help@gcc.gnu.org
Sent: Wed, April 13, 2011 10:08:57 PM
Subject: Re: Parallel execution
Hasan MUTLU <bigpatboy@yahoo.com> writes:
> I have implemented a multiprocessor system and want to run a code on my system.
>
> My idea is to have a compiler support that tells me which instructions could be
>
> executed in parallel without any problems. In other words, I have a given code
> that is written without considering any kind of parallelization (a standard C
> code written for single processor) and I want my compiler to tell me which
> instructions don't have any kind of dependencies, so could be run in parallel.
> This might remind you VLIW, which deals more or less with the same problem. You
>
> can ignore how my hardware deals with this information. My question is how
>close
>
> I can get to this information with gcc compiler. In other words, how can I
> determine instruction dependencies, the instructions that could be run in
> parallel? Any command line options (if there is) or a pointer in the source
>code
>
> of gcc would be helpful.
gcc doesn't support this directly. You can get the information by using
-fdump-rtl-sched2. Also fiddle with -fsched-verbose=N.
Ian