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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ADCE
ArgumentPromotion
BlockPlacement
BranchFolding
CodeExtractor
CodeGenPrepare
CondProp
ConstantMerge
ConstProp	Expand this test to handle more cases (remainder and shifts) of zero.	2009-06-21 01:56:41 +00:00
DeadArgElim
DeadStoreElimination	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
FunctionAttrs
GlobalDCE
GlobalOpt	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
GVN	This fixes a bug introduced in 72661, which can	2009-06-17 20:48:23 +00:00
GVNPRE	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
IndMemRem
IndVarSimplify	When a value is used multiple times within a single PHI, instructions	2009-06-27 05:16:57 +00:00
Inline
InstCombine	Generalize the zext(trunc(t) & C) instcombine to work even with	2009-06-18 16:30:21 +00:00
Internalize
IPConstantProp
JumpThreading	make jump threading handle lexically identical compare instructions	2009-06-19 16:27:56 +00:00
LCSSA	Fix LCSSA to avoid emitting a PHI node for the unwind destination of	2009-06-26 00:31:13 +00:00
LICM
LoopDeletion
LoopIndexSplit	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
LoopRotate
LoopSimplify	Teach LoopSimplify how to merge multiple loop exits into a single exit,	2009-06-27 21:30:38 +00:00
LoopStrengthReduce	Tweak this test to be a little less unusual.	2009-06-20 00:40:56 +00:00
LoopUnroll
LoopUnswitch
LowerInvoke
LowerSetJmp
LowerSwitch
Mem2Reg	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
MemCpyOpt	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
MergeFunc	Given two identical weak functions, produce one internal function and two weak	2009-06-12 15:56:56 +00:00
PredicateSimplifier
PruneEH	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
RaiseAllocations
Reassociate	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
ScalarRepl	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
SCCP	Split the Add, Sub, and Mul instruction opcodes into separate	2009-06-04 22:49:04 +00:00
SimplifyCFG	Fix the crash in this test. This is basically the same	2009-06-15 20:59:27 +00:00
SimplifyLibCalls	part of PR4405: disable a contentious optimization for	2009-06-19 04:17:36 +00:00
SRETPromotion
StripSymbols
TailCallElim	Improve tail call elim to move loads above readonly calls	2009-06-19 04:22:16 +00:00
TailDup