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Re: [PATCH 4.8, i386]: Enable post-reload compare optimization pass (PR28685)

From: Uros Bizjak <ubizjak at gmail dot com>
To: Steven Bosscher <stevenb dot gcc at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org, Richard Henderson <rth at redhat dot com>
Date: Sun, 5 Feb 2012 18:34:23 +0100
Subject: Re: [PATCH 4.8, i386]: Enable post-reload compare optimization pass (PR28685)
References: <CAFULd4Z+BZ3-rLckm0s5cQtjnrJ8evAneccZbNvwS78ynLO5vA@mail.gmail.com> <CABu31nNUFewfXuZ8kkMAOYtbuBtZSdEr8Qc4cuQm6_L2pAEz5g@mail.gmail.com>

On Sun, Feb 5, 2012 at 6:27 PM, Steven Bosscher <stevenb.gcc@gmail.com> wrote:

>> ? ? ? ?PR target/28685
>> ? ? ? ?* config/i386/i386.c (TARGET_FLAGS_REGNUM): New.
>>
>
> Hmm, how is this (apparently new in 2011) TARGET_FLAGS_REGNUM
> different from the older targetm.fixed_condition_code_regs?

This is how backend enables the pass, please see
gate_compare_elim_after_reload function in gcc/compare-elim.c.

FWIW, the value could be anything != INVALID_REGNUM.

Uros.

References:
- [PATCH 4.8, i386]: Enable post-reload compare optimization pass (PR28685)
  - From: Uros Bizjak
- Re: [PATCH 4.8, i386]: Enable post-reload compare optimization pass (PR28685)
  - From: Steven Bosscher

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