3 Commits

Author	SHA1	Message	Date
Dan Gohman	15cab2817b	Back out the change in 64918 that used sign-extensions when promoting ... trip counts that use signed comparisons. It's not obviously the best approach for preserving trip count information, and at any rate there isn't anything in the tree right now that makes use of that, so for now always using zero-extensions is preferable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65347 91177308-0d34-0410-b5e6-96231b3b80d8	2009-02-23 23:20:35 +00:00
Dan Gohman	f5a309e989	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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64918 91177308-0d34-0410-b5e6-96231b3b80d8	2009-02-18 17:22:41 +00:00
Dan Gohman	74786c0f43	Rename IndVarsSimplify to IndVarSimplify, to be consistent with ... the name used in the code that these tests are for. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64624 91177308-0d34-0410-b5e6-96231b3b80d8	2009-02-16 00:56:15 +00:00