On Fri, Jul 4, 2008 at 12:05 AM, Tianwei <[EMAIL PROTECTED]> wrote:
> Hi, all,
> My current project wants to reuse DDG's infrastructure to get some
> loop carried dependency information, I debug these code for a while,
> but have some questions, Hope you can
> give me some suggestions.
>
> 1. my platform is X86, and gcc version is 4.3.1, when i use -fsms,
> and debug the code, found that for the following code, if always
> return NULL_RTX:
>
> /* Make sure this is a doloop. */
> if ( !(count_reg = doloop_register_get (head, tail)))
> {
> if (dump_file)
> fprintf (dump_file, "SMS doloop_register_get failed\n");
> continue;
> }
>
> when I check the doloop_register_get, and found that it's guarded by a
> ifdef "HAVE_doloop_end", even i make clobber the whole compiler,
> rebuild the compiler by "CFLAGS='-DHAVE_doloop_end'", it still will
> complain error, can't find the gen_doloop_end.
>
> so the first question is: does SMS is support on X86?
No. the x86 backend has no doloop insn pattern. To see what that
means, see loop-doloop.c, and look for doloop in
http://gcc.gnu.org/onlinedocs/gccint/Standard-Names.html.
Gr.
Steven
