X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FTarget%2FAArch64%2FAArch64ISelLowering.cpp;h=464f56780dfd1a74c24704a7aafe53cb81a2a806;hp=f1073beb32f32576d1a63cf5886466f2a24b0c39;hb=f99fa6d5fd3c176ffdd9e723fe97d640667b34e6;hpb=ba5a585242e258b67a00ecb4f6708b634d098c17

diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp
index f1073beb32f..464f56780df 100644
--- a/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -7201,6 +7201,12 @@ static SDValue performConcatVectorsCombine(SDNode *N,
         (N00VT == MVT::v2i64 || N00VT == MVT::v4i32) &&
         N00VT.getScalarSizeInBits() == 4 * VT.getScalarSizeInBits()) {
       MVT MidVT = (N00VT == MVT::v2i64 ? MVT::v2i32 : MVT::v4i16);
+#if defined(__GNUC__)
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 7 && __GNUC_PATCHLEVEL__ == 2
+      // FIXME: g++-4.7.2 might miscompile PerformDAGCombine().
+      asm volatile("":::"memory");
+#endif
+#endif
       MVT ConcatMidVT = MVT::getVectorVT(MidVT.getVectorElementType(),
                                          MidVT.getVectorNumElements() * 2);
       return DAG.getNode(