diff --git a/src/datatype.c b/src/datatype.c
index 57f2111127bfaa..3f511ae8d9723a 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -191,18 +191,6 @@ unsigned jl_special_vector_alignment(size_t nfields, jl_value_t *t)
 {
     if (!jl_is_vecelement_type(t))
         return 0;
-    // LLVM 3.7 and 3.8 either crash or generate wrong code for many
-    // SIMD vector sizes N. It seems the rule is that N can have at
-    // most 2 non-zero bits. (This is true at least for N<=100.) See
-    // also <https://llvm.org/bugs/show_bug.cgi?id=27708>.
-    size_t mask = nfields;
-    // See e.g.
-    // <https://graphics.stanford.edu/%7Eseander/bithacks.html> for an
-    // explanation of this bit-counting algorithm.
-    mask &= mask-1;             // clear least-significant 1 if present
-    mask &= mask-1;             // clear another 1
-    if (mask)
-        return 0;               // nfields has more than two 1s
     assert(jl_datatype_nfields(t)==1);
     jl_value_t *ty = jl_field_type((jl_datatype_t*)t, 0);
     if (!jl_is_primitivetype(ty))