2 Commits

Author	SHA1	Message	Date
Guozhi Wei	d2210af332	[MBP] Move a latch block with conditional exit and multi predecessors to top of loop ... Current findBestLoopTop can find and move one kind of block to top, a latch block has one successor. Another common case is: * a latch block * it has two successors, one is loop header, another is exit * it has more than one predecessors If it is below one of its predecessors P, only P can fall through to it, all other predecessors need a jump to it, and another conditional jump to loop header. If it is moved before loop header, all its predecessors jump to it, then fall through to loop header. So all its predecessors except P can reduce one taken branch. Differential Revision: https://reviews.llvm.org/D43256 llvm-svn: 363471	2019-06-14 23:08:59 +00:00
Tony Jiang	3b49dc548f	[PowerPC] Partially enable the ISEL expansion pass. ... The pass to expand ISEL instructions into if-then-else sequences in patch D23630 is currently disabled. This patch partially enable it by always removing the unnecessary ISELs (all registers used by the ISELs are the same one) and folding the ISELs which have the same input registers into unconditional copies. Differential Revision: https://reviews.llvm.org/D40497 llvm-svn: 320414	2017-12-11 20:42:37 +00:00