set(objs obj1 obj2)
set(targets  sse2 sse4 avx avx2)
foreach(o IN LISTS objs)
  set(item "objs/${o}\\.ispc\\.(o|obj)")
  check_installed("${item}")
  foreach(t IN LISTS targets)
    set(item "objs/${o}\\.ispc_${t}\\.(o|obj)")
    check_installed("${item}")
  endforeach()
endforeach()