Dan Gohman 4b35f83b91 Teach LoopSimplify how to merge multiple loop exits into a single exit, ... when one of them can be converted to a trivial icmp and conditional branch. This addresses what is essentially a phase ordering problem. SimplifyCFG knows how to do this transformation, but it doesn't do so if the primary block has any instructions in it other than an icmp and a branch. In the given testcase, the block contains other instructions, however they are loop-invariant and can be hoisted. SimplifyCFG doesn't have LoopInfo though, so it can't hoist them. And, it's important that the blocks be merged before LoopRotation, as it doesn't support multiple-exit loops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74396 91177308-0d34-0410-b5e6-96231b3b80d8		2009-06-27 21:30:38 +00:00
..
IPO	Use a SmallPtrSet instead of std::set.	2009-03-23 23:39:20 +00:00
Utils	Teach LoopSimplify how to merge multiple loop exits into a single exit,	2009-06-27 21:30:38 +00:00
Instrumentation.h
IPO.h	Add an early implementation of a partial inlining pass. The idea behind this	2009-06-14 08:26:32 +00:00
RSProfiling.h
Scalar.h	Fix old-style type names in comments.	2009-06-14 23:30:43 +00:00