<div dir="ltr">I hit this issue in D37286 where depending on the types, some of the patterns start with a unnecessary bitconvert that SimplfiyTree is trying to skip over. So it is currently being tested by the x86 backend.<div><br></div><div>I can try to write a unit test if you want. I've not really looked much at our existing TableGen tests before.</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature">~Craig</div></div>
<br><div class="gmail_quote">On Mon, Sep 4, 2017 at 10:22 AM, David Blaikie via llvm-commits <span dir="ltr"><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">No chance of a test case for this, I take it?</div><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 29, 2017 at 7:06 PM Craig Topper via llvm-commits <<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: ctopper<br>
Date: Tue Aug 29 19:05:03 2017<br>
New Revision: 312088<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=312088&view=rev" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-<wbr>project?rev=312088&view=rev</a><br>
Log:<br>
[TableGen] Fix a range based for loop to take the value by reference so that SimplifyTree can modify the copy in the array if its needs to.<br>
<br>
Modified:<br>
    llvm/trunk/utils/TableGen/<wbr>CodeGenDAGPatterns.cpp<br>
<br>
Modified: llvm/trunk/utils/TableGen/<wbr>CodeGenDAGPatterns.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp?rev=312088&r1=312087&r2=312088&view=diff" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-<wbr>project/llvm/trunk/utils/<wbr>TableGen/CodeGenDAGPatterns.<wbr>cpp?rev=312088&r1=312087&r2=<wbr>312088&view=diff</a><br>
==============================<wbr>==============================<wbr>==================<br>
--- llvm/trunk/utils/TableGen/<wbr>CodeGenDAGPatterns.cpp (original)<br>
+++ llvm/trunk/utils/TableGen/<wbr>CodeGenDAGPatterns.cpp Tue Aug 29 19:05:03 2017<br>
@@ -2304,7 +2304,7 @@ InferAllTypes(const StringMap<SmallVecto<br>
   bool MadeChange = true;<br>
   while (MadeChange) {<br>
     MadeChange = false;<br>
-    for (TreePatternNode *Tree : Trees) {<br>
+    for (TreePatternNode *&Tree : Trees) {<br>
       MadeChange |= Tree->ApplyTypeConstraints(*<wbr>this, false);<br>
       MadeChange |= SimplifyTree(Tree);<br>
     }<br>
<br>
<br>
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</blockquote></div>
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<br></blockquote></div><br></div>