Sanjoy Das 45dc94a856 [IRCE] Fix how IRCE checks for no-sign-overflow. ...

IRCE requires the induction variables it handles to not sign-overflow.
The current scheme of checking if sext({X,+,S}) == {sext(X),+,sext(S)}
fails when SCEV simplifies sext(X) too.  After this change we //also//
check no-signed-wrap by looking at the flags set on the SCEVAddRecExpr.

llvm-svn: 233102

2015-03-24 19:29:22 +00:00

52 KiB

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