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Author SHA1 Message Date
Sam Parker 47251582f5 [SimplifyCFG] Cost required selects 
Before we speculatively execute a basic block, query the cost of
inserting the necessary select instructions against the phi folding
threshold. For non-trivial insertions, a more accurate decision can
probably be made during machine if-conversion. With minsize we query
the CodeSize cost, otherwise we use SizeAndLatency.

Differential Revision: https://reviews.llvm.org/D82438
 2020-08-21 09:52:52 +01:00
Sam Parker ac50efd67c [NFC][ARM][SimplifyCFG] Add some tests. 
Add some tests around thresholds and minsize.
 2020-08-11 15:13:58 +01:00
Sam Parker ed48e6fa65 [NFC][ARM] Add SimplifyCFG test 2020-07-17 14:07:40 +01:00