Quentin Colombet e9a4e0681e [PeepholeOptimizer] Advanced rewriting of copies to avoid cross register banks ... copies. This patch extends the peephole optimization introduced in r190713 to produce register-coalescer friendly copies when possible. This extension taught the existing cross-bank copy optimization how to deal with the instructions that generate cross-bank copies, i.e., insert_subreg, extract_subreg, reg_sequence, and subreg_to_reg. E.g. b = insert_subreg e, A, sub0 <-- cross-bank copy ... C = copy b.sub0 <-- cross-bank copy Would produce the following code: b = insert_subreg e, A, sub0 <-- cross-bank copy ... C = copy A <-- same-bank copy This patch also introduces a new helper class for that: ValueTracker. This class implements the logic to look through the copy related instructions and get the related source. For now, the advanced rewriting is disabled by default as we are lacking the semantic on target specific instructions to catch the motivating examples. Related to <rdar://problem/12702965>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212100 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-01 14:33:36 +00:00
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llvm	[PeepholeOptimizer] Advanced rewriting of copies to avoid cross register banks	2014-07-01 14:33:36 +00:00
llvm-c	Re-apply r211287: Remove support for LLVM runtime multi-threading.	2014-06-27 15:13:01 +00:00