diff --git a/src/llvm b/src/llvm
index 6d08185a5cf48..2717444753318 160000
--- a/src/llvm
+++ b/src/llvm
@@ -1 +1 @@
-Subproject commit 6d08185a5cf488d0a853b065a8a3a6d7a29f084f
+Subproject commit 2717444753318e461e0c3b30dacd03ffbac96903
diff --git a/src/rustllvm/llvm-rebuild-trigger b/src/rustllvm/llvm-rebuild-trigger
index feb6d98fe4614..7f54d9276bfc7 100644
--- a/src/rustllvm/llvm-rebuild-trigger
+++ b/src/rustllvm/llvm-rebuild-trigger
@@ -1,4 +1,4 @@
 # If this file is modified, then llvm will be (optionally) cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2017-11-07
+2017-11-08
diff --git a/src/test/codegen/issue-45466.rs b/src/test/codegen/issue-45466.rs
new file mode 100644
index 0000000000000..3702b6753898e
--- /dev/null
+++ b/src/test/codegen/issue-45466.rs
@@ -0,0 +1,25 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// min-llvm-version 4.0
+// compile-flags: -O
+
+#![crate_type="rlib"]
+
+// CHECK-LABEL: @memzero
+// CHECK-NOT: store
+// CHECK: call void @llvm.memset
+// CHECK-NOT: store
+#[no_mangle]
+pub fn memzero(data: &mut [u8]) {
+    for i in 0..data.len() {
+        data[i] = 0;
+    }
+}