Sam Parker 65f78e73ad [SimplifyCFG] Consider cost of combining predicates. ...

Modify FoldBranchToCommonDest to consider the cost of inserting
instructions when attempting to combine predicates to fold blocks.
The threshold can be controlled via a new option:
-simplifycfg-branch-fold-threshold which defaults to '2' to allow
the insertion of a not and another logical operator.

Differential Revision: https://reviews.llvm.org/D86526

2020-09-07 10:04:50 +01:00

241 KiB

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