llvm-6502

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Commit Graph

Author	SHA1	Message	Date
Nick Lewycky	789558db70	Wind SCEV back in time, to Nov 18th. This 'fixes' PR3275, PR3294, PR3295, PR3296 and PR3302. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62160 91177308-0d34-0410-b5e6-96231b3b80d8	2009-01-13 09:18:58 +00:00
Nick Lewycky	dd643f26c4	Add a utility function that detects whether a loop is guaranteed to be finite. Use it to safely handle less-than-or-equals-to exit conditions in loops. These also occur when the loop exit branch is exit on true because SCEV inverses the icmp predicate. Use it again to handle non-zero strides, but only with an unsigned comparison in the exit condition. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59528 91177308-0d34-0410-b5e6-96231b3b80d8	2008-11-18 15:10:54 +00:00

Author

SHA1

Message

Date

Nick Lewycky

789558db70

Wind SCEV back in time, to Nov 18th. This 'fixes' PR3275, PR3294, PR3295,

PR3296 and PR3302.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62160 91177308-0d34-0410-b5e6-96231b3b80d8

2009-01-13 09:18:58 +00:00

Nick Lewycky

dd643f26c4

Add a utility function that detects whether a loop is guaranteed to be finite.

Use it to safely handle less-than-or-equals-to exit conditions in loops. These
also occur when the loop exit branch is exit on true because SCEV inverses the
icmp predicate.

Use it again to handle non-zero strides, but only with an unsigned comparison
in the exit condition.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59528 91177308-0d34-0410-b5e6-96231b3b80d8

2008-11-18 15:10:54 +00:00

2 Commits