; RUN: opt < %s -instcombine -S | not grep sub
define <3 x i8> @f(<3 x i8> %a) {
%A = sub <3 x i8> zeroinitializer, %a
%B = mul <3 x i8> %A, <i8 5, i8 5, i8 5>
ret <3 x i8> %B
}