<p dir="ltr">Don't we normally do this by blacklisting the particular revision?</p>
<br><div class="gmail_quote">On Tue, Mar 17, 2015, 4:02 PM NAKAMURA Takumi <<a href="mailto:geek4civic@gmail.com">geek4civic@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: chapuni<br>
Date: Tue Mar 17 17:55:01 2015<br>
New Revision: 232561<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=232561&view=rev" target="_blank">http://llvm.org/viewvc/llvm-<u></u>project?rev=232561&view=rev</a><br>
Log:<br>
Appease AArch64ISelLowering.cpp miscompiled by g++-4.7.2.<br>
<br>
I will revert this when 4.7.3 is ready.<br>
<br>
Modified:<br>
    llvm/trunk/lib/Target/AArch64/<u></u>AArch64ISelLowering.cpp<br>
<br>
Modified: llvm/trunk/lib/Target/AArch64/<u></u>AArch64ISelLowering.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp?rev=232561&r1=232560&r2=232561&view=diff" target="_blank">http://llvm.org/viewvc/llvm-<u></u>project/llvm/trunk/lib/Target/<u></u>AArch64/AArch64ISelLowering.<u></u>cpp?rev=232561&r1=232560&r2=<u></u>232561&view=diff</a><br>
==============================<u></u>==============================<u></u>==================<br>
--- llvm/trunk/lib/Target/AArch64/<u></u>AArch64ISelLowering.cpp (original)<br>
+++ llvm/trunk/lib/Target/AArch64/<u></u>AArch64ISelLowering.cpp Tue Mar 17 17:55:01 2015<br>
@@ -7201,6 +7201,12 @@ static SDValue performConcatVectorsCombi<br>
         (N00VT == MVT::v2i64 || N00VT == MVT::v4i32) &&<br>
         N00VT.getScalarSizeInBits() == 4 * VT.getScalarSizeInBits()) {<br>
       MVT MidVT = (N00VT == MVT::v2i64 ? MVT::v2i32 : MVT::v4i16);<br>
+#if defined(__GNUC__)<br>
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 7 && __GNUC_PATCHLEVEL__ == 2<br>
+      // FIXME: g++-4.7.2 might miscompile PerformDAGCombine().<br>
+      asm volatile("":::"memory");<br>
+#endif<br>
+#endif<br>
       MVT ConcatMidVT = MVT::getVectorVT(MidVT.<u></u>getVectorElementType(),<br>
                                          MidVT.getVectorNumElements() * 2);<br>
       return DAG.getNode(<br>
<br>
<br>
______________________________<u></u>_________________<br>
llvm-commits mailing list<br>
<a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank">llvm-commits@cs.uiuc.edu</a><br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank">http://lists.cs.uiuc.edu/<u></u>mailman/listinfo/llvm-commits</a><br>
</blockquote></div>