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Re: Patch to improve PIC find_base_term
- To: john at feith dot com
- Subject: Re: Patch to improve PIC find_base_term
- From: Geoff Keating <geoffk at cygnus dot com>
- Date: Mon, 21 Aug 2000 17:41:14 -0700
- CC: gcc-patches at gcc dot gnu dot org
- References: <200008212129.RAA02438@jwlab.FEITH.COM>
> Date: Mon, 21 Aug 2000 17:29:32 -0400 (EDT)
> From: John Wehle <john@feith.com>
> Something such as PIC_BASE_TERM is still necessary for alias analysis
> to understand PIC addresses which refer to static objects. Actually,
> it would also be nice if alias analysis understood the GOT loads
> (so it knew about references to global objects when using PIC) ...
> perhaps a change to find_base_value? I'll investigate further.
You could portably represent that in the RTL by adding a
REG_EQUAL/REG_EQUIV note: (reg_equiv (symbol_ref "foo")).
Then propagate this with the alias-analysis code.
--
- Geoffrey Keating <geoffk@cygnus.com>