Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: llc < %s -mtriple=x86_64-- -mattr=+sse2 define void @test(ptr %R, <4 x float> %X) nounwind { %tmp = extractelement <4 x float> %X, i32 3 store float %tmp, ptr %R ret void }