llvm-6502

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Commit Graph

Author	SHA1	Message	Date
Dan Gohman	51f53b7f5a	Fix ScalarEvolution's backedge-taken count computations to check for overflow when computing a integer division to round up. Thanks to Nick Lewycky for noticing this! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73862 91177308-0d34-0410-b5e6-96231b3b80d8	2009-06-21 23:46:38 +00:00
Dan Gohman	a1af757e0a	Extend ScalarEvolution's getBackedgeTakenCount to be able to compute an upper-bound value for the trip count, in addition to the actual trip count. Use this to allow getZeroExtendExpr and getSignExtendExpr to fold casts in more cases. This may eventually morph into a more general value-range analysis capability; there are certainly plenty of places where more complete value-range information would allow more folding. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70509 91177308-0d34-0410-b5e6-96231b3b80d8	2009-04-30 20:47:05 +00:00

Author

SHA1

Message

Date

Dan Gohman

51f53b7f5a

Fix ScalarEvolution's backedge-taken count computations to check for

overflow when computing a integer division to round up.

Thanks to Nick Lewycky for noticing this!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73862 91177308-0d34-0410-b5e6-96231b3b80d8

2009-06-21 23:46:38 +00:00

Dan Gohman

a1af757e0a

Extend ScalarEvolution's getBackedgeTakenCount to be able to

compute an upper-bound value for the trip count, in addition to
the actual trip count. Use this to allow getZeroExtendExpr and
getSignExtendExpr to fold casts in more cases.

This may eventually morph into a more general value-range
analysis capability; there are certainly plenty of places where
more complete value-range information would allow more folding.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70509 91177308-0d34-0410-b5e6-96231b3b80d8

2009-04-30 20:47:05 +00:00

2 Commits