Dan Gohman 8078b8bddc Use a sign-extend instead of a zero-extend when promoting a
trip count value when the original loop iteration condition is
signed and the canonical induction variable won't undergo signed
overflow. This isn't required for correctness; it just preserves
more information about original loop iteration values.

Add a getTruncateOrSignExtend method to ScalarEvolution,
following getTruncateOrZeroExtend.

llvm-svn: 64918
2009-02-18 17:22:41 +00:00
..
2009-02-13 07:15:53 +00:00
2008-12-18 09:01:18 +00:00
2008-05-29 21:05:16 +00:00