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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2003-04-25-AssertFail.ll
2003-05-12-PreheaderExitOfChild.ll
2003-08-15-PreheadersFail.ll
2003-12-10-ExitBlocksProblem.ll
2004-02-05-DominatorInfoCorruption.ll
2004-03-15-IncorrectDomUpdate.ll
2004-04-01-IncorrectDomUpdate.ll
2004-04-12-LoopSimplify-SwitchBackedges.ll
2004-04-13-LoopSimplifyUpdateDomFrontier.ll
2007-10-28-InvokeCrash.ll
basictest.ll
dg.exp
hardertest.ll
merge-exits.ll
phi-node-simplify.ll
single-backedge.ll