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To: Daniel Berlin <dberlin@dberlin.org>,
   Toon Moene <toon@moene.indiv.nluug.nl>
cc: gcc@gcc.gnu.org
Subject: Re: Alias analysis - does base_alias_check still work ? 
In-Reply-To: Message from Daniel Berlin <dberlin@dberlin.org> 
   of "Fri, 19 Jul 2002 10:51:59 EDT." <Pine.LNX.4.44.0207191051100.18232-100000@dberlin.org> 
Date: Fri, 19 Jul 2002 11:03:00 -0000
From: David Edelsohn <dje@watson.ibm.com>
X-SW-Source: 2002-07/txt/msg00862.txt.bz2

>>>>> Daniel Berlin writes:

>> Which begs the question: Is there a reason -fschedule-insns isn't on by
>> default when using -O2 ?

Daniel> Err, it is.

Daniel> if (optimize >= 2)

Daniel> flag_peephole2 = 1;
Daniel> #ifdef INSN_SCHEDULING
Daniel> flag_schedule_insns = 1;
Daniel> flag_schedule_insns_after_reload = 1;
Daniel> #endif

	Except i386.c turns it off:

void
optimization_options (level, size)
     int level;
     int size ATTRIBUTE_UNUSED;
{
  /* For -O2 and beyond, turn off -fschedule-insns by default.  It tends to
     make the problem with not enough registers even worse.  */
#ifdef INSN_SCHEDULING
  if (level > 1)
    flag_schedule_insns = 0;
#endif

David