another tweak for WIN64

git-svn-id: https://svn.r-project.org/R/trunk@66830 00db46b3-68df-0310-9c12-caf00c1e9a41
tweaks

git-svn-id: https://svn.r-project.org/R/trunk@66832 00db46b3-68df-0310-9c12-caf00c1e9a41
minor simplification (as.double happens in C)


git-svn-id: https://svn.r-project.org/R/trunk@66833 00db46b3-68df-0310-9c12-caf00c1e9a41