From: Jeff Law <law@redhat.com>
To: Richard Biener <richard.guenther@gmail.com>,
GCC Patches <gcc-patches@gcc.gnu.org>,
richard.sandiford@arm.com
Subject: Re: Remove redundant AND from count reduction loop
Date: Wed, 24 Jun 2015 16:42:00 -0000 [thread overview]
Message-ID: <558AD54D.9050204@redhat.com> (raw)
In-Reply-To: <CAFiYyc1M4-j8QOWSkowHp8fh5D9ScYACEDPQ0KHH52tEBrP54g@mail.gmail.com>
On 06/24/2015 05:43 AM, Richard Biener wrote:
>>> Note that ISTR code performing exactly the opposite transform in
>>> fold-const.c ...
>>
>> That's another reason why I'm worried about just doing the (negate ...)
>> thing without knowing whether the negate can be folded into anything else.
>
> I'm not aware of anything here.
It's worth looking at -- I've certainly seen cases where we end up
infinite recursion because we've got a transformation in once place (say
match.pd) and its inverse elsewhere (fold-const.c).
Jeff
next prev parent reply other threads:[~2015-06-24 16:05 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-23 15:42 Richard Sandiford
2015-06-23 21:36 ` Marc Glisse
2015-06-24 9:25 ` Richard Biener
2015-06-24 9:59 ` Richard Sandiford
2015-06-24 10:22 ` Richard Biener
2015-06-24 11:29 ` Richard Sandiford
2015-06-24 11:56 ` Richard Biener
2015-06-24 12:37 ` Richard Sandiford
2015-06-24 13:11 ` Richard Biener
2015-06-24 13:53 ` Richard Sandiford
2015-06-24 14:09 ` Richard Biener
2015-06-25 8:19 ` Richard Sandiford
2015-06-25 10:39 ` Richard Biener
2015-06-25 11:52 ` Richard Sandiford
2015-06-25 13:17 ` Richard Biener
2015-06-24 16:42 ` Jeff Law [this message]
2015-06-25 22:48 ` Marc Glisse
2015-06-26 9:59 ` Richard Biener
2015-06-28 14:09 ` Marc Glisse
2015-06-29 9:16 ` Richard Biener
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