--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/X86/fold-vector-sext-crash.ll	Mon Sep 08 22:06:00 2014 +0900
@@ -0,0 +1,12 @@
+; RUN: llc < %s -mcpu=core-avx-i -mtriple=i386-unknown-linux-gnu -mattr=+avx,+popcnt,+cmov
+
+; Make sure that we don't introduce illegal build_vector dag nodes
+; when trying to fold a sign_extend of a constant build_vector.
+; After r200234 the test case below was crashing the compiler with an assertion failure
+; due to an illegal build_vector of type MVT::v4i64.
+
+define <4 x i64> @foo(<4 x i64> %A) {
+  %1 = select <4 x i1> <i1 true, i1 true, i1 false, i1 false>, <4 x i64> %A, <4 x i64><i64 undef, i64 undef, i64 0, i64 0>
+  ret <4 x i64> %1
+}
+