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List:       llvm-dev
Subject:    Re: [llvm-dev] [FPEnv] FNEG instruction
From:       Cameron McInally via llvm-dev <llvm-dev () lists ! llvm ! org>
Date:       2018-08-30 15:38:05
Message-ID: CAKs25gPYUv0PBnWUoWG8j=GzYNSSjL7T_CZJ7tSR796aJt6Nmg () mail ! gmail ! com
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On Thu, Aug 30, 2018 at 11:14 AM, Tim Northover <t.p.northover@gmail.com>
wrote:

> ...
> I don't think it matters for the question at hand, but I tested
> AArch64 too and it exhibits the behaviour you were describing. That
> is, we'd have problems if an fsub -0.0 was actually CodeGened like
> that (it's not, of course).


Great data point. So it's not just a theoretical problem. Thanks, Tim!

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<div dir="ltr">On Thu, Aug 30, 2018 at 11:14 AM, Tim Northover <span dir="ltr">&lt;<a \
href="mailto:t.p.northover@gmail.com" \
target="_blank">t.p.northover@gmail.com</a>&gt;</span> wrote:<br><div \
class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div \
class="HOEnZb"><div class="h5">...</div></div>I don&#39;t think it matters for the \
question at hand, but I tested<br> AArch64 too and it exhibits the behaviour you were \
describing. That<br> is, we&#39;d have problems if an fsub -0.0 was actually \
CodeGened like<br> that (it&#39;s not, of \
course).</blockquote><div><br></div><div>Great data point. So it&#39;s not just a \
theoretical problem. Thanks, Tim!</div></div><br></div></div>


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