From: David Edelsohn <dje.gcc@gmail.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>,
Michael Meissner <mrmeissn@us.ibm.com>,
Alan Modra <amodra@gmail.com>
Subject: Re: [RS6000] Fix 65576 regression
Date: Thu, 02 Apr 2015 17:03:00 -0000 [thread overview]
Message-ID: <CAGWvnymHfN8oTkSS0GA7YATtWHPkj_Thh+u-iisfaMcjaHw7dQ@mail.gmail.com> (raw)
In-Reply-To: <20150402052235.GU26234@bubble.grove.modra.org>
On Thu, Apr 2, 2015 at 1:22 AM, Alan Modra <amodra@gmail.com> wrote:
> This cures an unrecognizable insn ICE by modifying a predicate of
> extenddftf2_internal (the only place this predicate is used) to ensure
> that rtl optimization passes do not substitute 0.0 for a register with
> known 0.0 value, except when VSX is enabled. ie. Don't undo the
> necessary register move emitted by the extenddftf2_fprs expander.
> Bootstrapped and regression tested powerpc64le-linux, powerpc64-linux
> and powerpc-linux. OK to apply?
>
> PR target/65576
> PR target/65240
> * config/rs6000/predicates.md (zero_reg_mem_operand): Exclude
> 0.0 constant unless TARGET_VSX.
This change seems to disable the final alternative in the
extenddftf2_internal pattern.
- David
next prev parent reply other threads:[~2015-04-02 17:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-02 5:22 Alan Modra
2015-04-02 17:03 ` David Edelsohn [this message]
2015-04-02 23:19 ` Alan Modra
2015-04-02 23:41 ` Michael Meissner
2015-04-03 0:03 ` David Edelsohn
2015-04-03 12:51 ` Alan Modra
2015-04-03 13:35 ` David Edelsohn
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