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
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Analysis	Eliminate a layer of indirection in LoopInfo and MachineLoopInfo.	2009-06-27 21:22:48 +00:00
Archive
AsmParser
Bitcode
CodeGen	Eliminate a layer of indirection in LoopInfo and MachineLoopInfo.	2009-06-27 21:22:48 +00:00
CompilerDriver	Guards for the compiler driver plugin list.	2009-06-26 00:06:28 +00:00
Debugger
ExecutionEngine	Get rid of unnecessary global variables.	2009-06-26 16:46:15 +00:00
Linker
MC	MC: Truncate values when printing, to keep 'as' happy.	2009-06-25 21:03:18 +00:00
Support	Use atomic operations for accessing this global counter.	2009-06-26 18:09:03 +00:00
System	Fix compilation without pthreads.	2009-06-26 08:48:03 +00:00
Target	Simplify a bit	2009-06-27 12:59:03 +00:00
Transforms	Teach LoopSimplify how to merge multiple loop exits into a single exit,	2009-06-27 21:30:38 +00:00
VMCore	Make this const.	2009-06-26 20:21:18 +00:00
Makefile	Start flushing out MCContext.	2009-06-23 22:01:43 +00:00