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8c40c5bf03
... for AddRec's in loops for which SCEV is unable to compute a max tripcount. This is not a problem for "normal" loops[0] that don't have guards or assumes, but helps in cases where we have guards or assumes in the loop that can be used to constrain incoming values over the backedge. This partially fixes PR27691 (we still don't handle the NUW case). [0]: for "normal" loops, in the cases where we'd be able to prove no-wrap via isKnownPredicate, we'd also be able to compute a max tripcount. llvm-svn: 269211 |
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