// Canonicalize movddup shuffles.
if (V2IsUndef && Subtarget->hasSSE2() &&
+ VT.getSizeInBits() == 128 &&
X86::isMOVDDUPMask(PermMask.getNode()))
return CanonicalizeMovddup(Op, V1, PermMask, DAG, Subtarget->hasSSE3());
--- /dev/null
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+mmx,+sse2
+; PR2850
+
+@tmp_V2i = common global <2 x i32> zeroinitializer ; <<2 x i32>*> [#uses=2]
+
+define void @f0() nounwind {
+entry:
+ %0 = load <2 x i32>* @tmp_V2i, align 8 ; <<2 x i32>> [#uses=1]
+ %1 = shufflevector <2 x i32> %0, <2 x i32> undef, <2 x i32> zeroinitializer ; <<2 x i32>> [#uses=1]
+ store <2 x i32> %1, <2 x i32>* @tmp_V2i, align 8
+ ret void
+}