From: Andrew Stubbs <andrew_stubbs@mentor.com>
To: Richard Biener <richard.guenther@gmail.com>
Cc: GCC Development <gcc@gcc.gnu.org>
Subject: Re: DSE and maskstore trouble
Date: Tue, 03 Jul 2018 11:38:00 -0000 [thread overview]
Message-ID: <1c2e2b84-694f-770a-8db5-2e77a7123cda@mentor.com> (raw)
In-Reply-To: <CAFiYyc0htULzK3W-RVdALC3f+jFtTpqq-k85PbMavYOCyHg6og@mail.gmail.com>
On 03/07/18 12:30, Richard Biener wrote:
>> Hmm, so they're safe, but may prevent the optimization of nearby variables?
>
> Yes, they prevent earlier stores into lanes that are "really" written
> to to be DSEd.
Right, but I have unrelated variables allocated to the stack within the
"shadow" of the masked vector. I didn't ask it to do that, it just does,
so I presume this is an expect feature of masked vectors with a known mask.
Surely this prevents valid optimizations on those variables?
Andrew
next prev parent reply other threads:[~2018-07-03 11:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 9:59 Andrew Stubbs
2018-07-03 10:16 ` Richard Biener
2018-07-03 10:33 ` Andrew Stubbs
2018-07-03 10:57 ` Andrew Stubbs
2018-07-03 11:02 ` Richard Biener
2018-07-03 11:06 ` Andrew Stubbs
2018-07-03 11:31 ` Richard Biener
2018-07-03 11:38 ` Andrew Stubbs [this message]
2018-07-03 11:46 ` Richard Biener
2018-07-03 11:57 ` Andrew Stubbs
2018-07-03 12:21 ` Richard Biener
2018-07-03 12:46 ` Andrew Stubbs
2018-07-03 13:52 ` Richard Biener
2018-07-03 15:19 ` Andrew Stubbs
2018-07-03 16:45 ` Richard Biener
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