Fix alignment check for non 16-byte alignments

src/layout.jl

@@ -24,21 +24,21 @@ struct Vec{N, T} end
     error()
 end
 
-@inline function checkalignment(ptr)
-    checkalignment(Bool, ptr) || throw_alignmenterror(ptr)
+@inline function checkalignment(ptr, alignment)
+    checkalignment(Bool, ptr, alignment) || throw_alignmenterror(ptr)
     nothing
 end
 
-@inline function checkalignment(::Type{Bool}, ptr)
-    Int(ptr) % 16 == 0
+@inline function checkalignment(::Type{Bool}, ptr, alignment)
+    Int(ptr) % alignment == 0
 end
 
 @inline @generated function vloada(::Type{Vec{N, T}}, ptr::Core.LLVMPtr{T, AS}) where {N, T, AS}
     alignment = sizeof(T) * N
 
     return quote
         vec_ptr = Base.bitcast(Core.LLVMPtr{NTuple{N, VecElement{T}}, AS}, ptr)
-        @boundscheck checkalignment(vec_ptr)
+        @boundscheck checkalignment(vec_ptr, $alignment)
         return unsafe_load(vec_ptr, 1, Val($alignment))
     end
 end
@@ -55,7 +55,7 @@ end
         append!(ex.args, (quote
             y = @ntuple $N j -> VecElement{T}(x[j+$offset].value)
             vec_ptr = Base.bitcast(Core.LLVMPtr{NTuple{N, VecElement{T}}, AS}, ptr)
-            @boundscheck checkalignment(vec_ptr)
+            @boundscheck checkalignment(vec_ptr, $alignment)
             unsafe_store!(vec_ptr, y, $offset ÷ N + 1, Val($alignment))
         end).args)
     end