diff --git a/test/CodeGen/X86/pr20012.ll b/test/CodeGen/X86/pr20012.ll
new file mode 100644
index 00000000000..b6e4b8eaa0a
--- /dev/null
+++ b/test/CodeGen/X86/pr20012.ll
@@ -0,0 +1,17 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s --check-prefix=X86
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s --check-prefix=X64
+
+define void @test () {
+; X86-LABEL: test:
+; X86:       # BB#0:
+; X86-NEXT:    movb $0, (%eax)
+; X86-NEXT:    retl
+;
+; X64-LABEL: test:
+; X64:       # BB#0:
+; X64-NEXT:    movb $0, (%rax)
+; X64-NEXT:    retq
+  store <2 x i4> zeroinitializer, <2 x i4>* undef, align 1
+  ret void
+}