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Reapplying r278731 after fixing the problem that caused it to be reverted.

Description

Reapplying r278731 after fixing the problem that caused it to be reverted.

Enhance SCEV to compute the trip count for some loops with unknown stride.

Patch by Pankaj Chawla

Differential Revision: https://reviews.llvm.org/D22377

Details

Committed
dlkreitzSep 16 2016, 7:38 AM
Differential Revision
D22377: [SCEV] trip count calculation for loops with unknown stride
Parents
rL281731: [libcxx] Add missing c++98 xfail. NFC.
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