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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://llvm.org/bugs/show_bug.cgi?id=9190">http://llvm.org/bugs/show_bug.cgi?id=9190</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The bug happens when the DAGCombiner attempts to optimize one of the patterns of the SUB opcode. It tries to create a zero of type v2i64. This type is legal on 32bit machines, but the initializer is target dependent. Currently, the initializer attempts to create an i64 zero constant, which fails. <o:p></o:p></p><p class=MsoNormal>Added a flag to tell the DAGCombiner to create a legal zero, if we require that the pass would generate legal types. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp<o:p></o:p></p><p class=MsoNormal>===================================================================<o:p></o:p></p><p class=MsoNormal>--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp (revision 124985)<o:p></o:p></p><p class=MsoNormal>+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp (working copy)<o:p></o:p></p><p class=MsoNormal>@@ -1533,7 +1533,7 @@<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> // fold (sub x, x) -> 0<o:p></o:p></p><p class=MsoNormal> if (N0 == N1)<o:p></o:p></p><p class=MsoNormal>- return DAG.getConstant(0, N->getValueType(0));<o:p></o:p></p><p class=MsoNormal>+ return DAG.getConstant(0, N->getValueType(0), LegalTypes);<o:p></o:p></p><p class=MsoNormal> // fold (sub c1, c2) -> c1-c2<o:p></o:p></p><p class=MsoNormal> if (N0C && N1C)<o:p></o:p></p><p class=MsoNormal> return DAG.FoldConstantArithmetic(ISD::SUB, VT, N0C, N1C);<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers, <o:p></o:p></p><p class=MsoNormal>Nadav<o:p></o:p></p></div><font face="monospace">---------------------------------------------------------------------<br>
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