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Re: combine accepting noop moves
- To: Jan Hubicka <jh at suse dot cz>, gcc-patches at gcc dot gnu dot org, rth at cygnus dot com, patches at x86-64 dot org, zackw at stanford dot edu
- Subject: Re: combine accepting noop moves
- From: Zachary Weinberg <zackw at stanford dot edu>
- Date: Sun, 22 Jul 2001 19:01:52 -0700 (PDT)
Jan Hubicka <jh@suse.cz> said:
> Hi,
> making set_noop_p to recognize noop-jumps reminded me the problem with
> noop moves in combine. This patch should track it. It makes combine
> to always recognize noop moves and then kill them by improved
> delete_noop_moves call.
Can you take out the peepholes I put in i386.md to deal with this and
then verify that if(!strcmp(...)) still doesn't generate unnecessary
set and cmp instructions, please?
zw