diff --git a/library/stdarch/src/x86/mod.rs b/library/stdarch/src/x86/mod.rs
index 13e11a48b64f..6dbdb3e247e4 100644
--- a/library/stdarch/src/x86/mod.rs
+++ b/library/stdarch/src/x86/mod.rs
@@ -1,5 +1,6 @@
 pub use self::sse::*;
 pub use self::sse2::*;
+pub use self::sse3::*;
 pub use self::ssse3::*;
 pub use self::sse41::*;
 pub use self::sse42::*;
@@ -25,6 +26,7 @@ mod runtime;
 
 mod sse;
 mod sse2;
+mod sse3;
 mod ssse3;
 mod sse41;
 mod sse42;
diff --git a/library/stdarch/src/x86/sse3.rs b/library/stdarch/src/x86/sse3.rs
new file mode 100644
index 000000000000..3cca6fc32e01
--- /dev/null
+++ b/library/stdarch/src/x86/sse3.rs
@@ -0,0 +1,36 @@
+use x86::__m128i;
+
+#[cfg(test)]
+use stdsimd_test::assert_instr;
+
+/// Load 128-bits of integer data from unaligned memory.
+/// This intrinsic may perform better than `_mm_loadu_si128`
+/// when the data crosses a cache line boundary.
+#[inline(always)]
+#[target_feature = "+sse3"]
+#[cfg_attr(test, assert_instr(lddqu))]
+pub unsafe fn _mm_lddqu_si128(mem_addr: *const __m128i) -> __m128i {
+    lddqu(mem_addr as *const _)
+}
+
+#[allow(improper_ctypes)]
+extern {
+    #[link_name = "llvm.x86.sse3.ldu.dq"]
+    fn lddqu(mem_addr: *const i8) -> __m128i;
+}
+
+
+#[cfg(test)]
+mod tests {
+    use stdsimd_test::simd_test;
+
+    use v128::*;
+    use x86::sse3 as sse3;
+
+    #[simd_test = "sse3"]
+    unsafe fn _mm_lddqu_si128() {
+        let a = i8x16::new(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
+        let r = sse3::_mm_lddqu_si128(&a);
+        assert_eq!(a, r);
+    }
+}
\ No newline at end of file