<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Unfortunately there is not target on llvm trunk that comes close to having 32 subregister lanes. So I can't commit a testcase here.</div><div class=""><br class=""></div><div class="">- Matthias</div><div class=""><br class=""></div>On Mar 3, 2015, at 5:21 PM, Chandler Carruth <<a href="mailto:chandlerc@google.com" class="">chandlerc@google.com</a>> wrote:<div><blockquote type="cite" class=""><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">On Tue, Mar 3, 2015 at 4:43 PM, Matthias Braun <span dir="ltr" class=""><<a href="mailto:matze@braunis.de" target="_blank" class="">matze@braunis.de</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div id=":5j" class="a3s" style="overflow:hidden">Author: matze<br class="">
Date: Tue Mar 3 18:43:50 2015<br class="">
New Revision: 231186<br class="">
<br class="">
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=231186&view=rev" target="_blank" class="">http://llvm.org/viewvc/llvm-project?rev=231186&view=rev</a><br class="">
Log:<br class="">
RegisterCoalescer: Gracefully continue if subrange merging fails.<br class="">
<br class="">
There is a known bug where the register coalescer fails to merge<br class="">
subranges when multiple ranges end up in the "overflow" bit 32 of the<br class="">
lanemasks. A proper fix for this is complicated so for now this is a<br class="">
workaround which lets the register coalescer drop the subregister<br class="">
liveness information (we just loose some precision by that) and<br class="">
continue.<br class="">
<br class="">
Modified:<br class="">
llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp</div></blockquote></div><br class="">No test case? This seems like something really important to cover...</div></div>
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