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<body><span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Potential improvement for vectorization of sub"
href="https://bugs.llvm.org/show_bug.cgi?id=35295">bug 35295</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>FIXED
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Potential improvement for vectorization of sub"
href="https://bugs.llvm.org/show_bug.cgi?id=35295#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Potential improvement for vectorization of sub"
href="https://bugs.llvm.org/show_bug.cgi?id=35295">bug 35295</a>
from <span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span></b>
<pre>(In reply to Serguei Katkov from <a href="show_bug.cgi?id=35295#c3">comment #3</a>)
<span class="quote">> Also the code for mul generated by icc is better than code generated by
> clang as well... I guess the reason should be close to this sub but I'm not
> sure.</span >
Yes - this is very similar to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Potential improvement for Loop Vectorization: XMM vs YMM vs ZMM"
href="show_bug.cgi?id=35299">bug 35299</a>.
This should be fixed in IR with:
<a href="https://reviews.llvm.org/rL318404">https://reviews.llvm.org/rL318404</a>
We might still want to add ISD::SUB to x86's list of narrowable binops in
combineTruncatedArithmetic(), but I think we should open another bug if that's
needed.
Also, someone looking at non-x86 optimizations might want to open a bug for the
problem mentioned in <a href="show_bug.cgi?id=35295#c5">comment 5</a>.</pre>
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