2 Commits

Author	SHA1	Message	Date
Brendon Cahoon	254f889dc5	MachinePipeliner pass that implements Swing Modulo Scheduling ... Software pipelining is an optimization for improving ILP by overlapping loop iterations. Swing Modulo Scheduling (SMS) is an implementation of software pipelining that attempts to reduce register pressure and generate efficient pipelines with a low compile-time cost. This implementaion of SMS is a target-independent back-end pass. When enabled, the pass should run just prior to the register allocation pass, while the machine IR is in SSA form. If the pass is successful, then the original loop is replaced by the optimized loop. The optimized loop contains one or more prolog blocks, the pipelined kernel, and one or more epilog blocks. This pass is enabled for Hexagon only. To enable for other targets, a couple of target specific hooks must be implemented, and the pass needs to be called from the target's TargetMachine implementation. Differential Review: http://reviews.llvm.org/D16829 llvm-svn: 277169	2016-07-29 16:44:44 +00:00
Krzysztof Parzyszek	1adca30c39	[Hexagon] Bitwise operations for insert/extract word not simplified ... Change the bit simplifier to generate REG_SEQUENCE instructions in addition to COPY, which will handle cases of word insert/extract. llvm-svn: 276787	2016-07-26 18:30:11 +00:00