3 Commits

Author	SHA1	Message	Date
Erik Eckstein	1de19a1b32	SimplifyCFG: fix a compile time problem with block merging ... When merging many blocks to a single block (in the wrong order), instructions are getting moved over and over again. This is quadratic and can result in very long compile times for large functions. To fix this, always move the instruction to smaller block to the larger block. rdar://problem/56268570	2020-04-10 20:10:24 +02:00
Erik Eckstein	3ad7d548c2	LICM: hoist calls to global_init functions ... Global initializers are executed only once. Therefore it's possible to hoist such an initializer call to a loop pre-header - in case there are no conflicting side-effects in the loop before the call. Also, the call must post-dominate the loop pre-header. Otherwise it would be executed speculatively.	2020-03-23 16:08:56 +01:00
Erik Eckstein	71eebaa720	CSE: remove redundant global initializer calls	2020-03-23 15:53:23 +01:00