Chris Lattner e27db74a60 improve switch formation to handle small range ... comparisons formed by comparisons. For example, this: void foo(unsigned x) { if (x == 0 || x == 1 || x == 3 || x == 4 || x == 6) bar(); } compiles into: _foo: ## @foo ## BB#0: ## %entry cmpl $6, %edi ja LBB0_2 ## BB#1: ## %entry movl %edi, %eax movl $91, %ecx btq %rax, %rcx jb LBB0_3 instead of: _foo: ## @foo ## BB#0: ## %entry cmpl $2, %edi jb LBB0_4 ## BB#1: ## %switch.early.test cmpl $6, %edi ja LBB0_3 ## BB#2: ## %switch.early.test movl %edi, %eax movl $88, %ecx btq %rax, %rcx jb LBB0_4 This catches a bunch of cases in GCC, which look like this: %804 = load i32* @which_alternative, align 4, !tbaa !0 %805 = icmp ult i32 %804, 2 %806 = icmp eq i32 %804, 3 %or.cond121 = or i1 %805, %806 %807 = icmp eq i32 %804, 4 %or.cond124 = or i1 %or.cond121, %807 br i1 %or.cond124, label %.thread, label %808 turning this into a range comparison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122045 91177308-0d34-0410-b5e6-96231b3b80d8		2010-12-17 06:20:15 +00:00
..
ADCE
ArgumentPromotion	Make BasicAliasAnalysis a normal AliasAnalysis implementation which	2010-10-18 18:04:47 +00:00
BlockPlacement
BranchFolding
CodeExtractor
CodeGenPrepare	Add a test for CodeGenPrepare's ability to look through PHI nodes when performing	2010-11-19 22:34:53 +00:00
ConstantMerge	fix PR8144, a bug where constant merge would merge globals marked	2010-09-15 00:30:11 +00:00
ConstProp	Teach ConstantFoldInstruction() how to fold insertvalue and extractvalue.	2010-11-29 20:36:52 +00:00
CorrelatedValuePropagation	Fix PR8790, another instance where unreachable code can cause instruction simplification to fail,	2010-12-15 00:55:35 +00:00
DeadArgElim
DeadStoreElimination	Fix PR8728, a miscompilation I recently introduced. When optimizing	2010-12-06 01:48:06 +00:00
FunctionAttrs	Make ModRefBehavior a lattice. Use this to clean up AliasAnalysis	2010-11-10 01:02:18 +00:00
GlobalDCE
GlobalOpt	reapply r121100 with a tweak to constant fold ConstExprs with TargetData	2010-12-07 04:33:29 +00:00
GVN	Preserve TBAA tags when doing load PRE.	2010-12-15 23:53:55 +00:00
IndVarSimplify	Remove LoopIndexSplit pass. It is neither maintained nor used by anyone.	2010-10-07 23:29:37 +00:00
Inline	Make BasicAliasAnalysis a normal AliasAnalysis implementation which	2010-10-18 18:04:47 +00:00
InstCombine	Speculatively revert commit 121905 since it looks like it might have broken the	2010-12-16 09:40:54 +00:00
Internalize
IPConstantProp	more test cleanup	2010-09-02 22:38:56 +00:00
JumpThreading	Teach jump threading to "look through" a select when the branch direction of a terminator depends on it.	2010-12-15 09:51:20 +00:00
LCSSA
LICM	Make BasicAliasAnalysis a normal AliasAnalysis implementation which	2010-10-18 18:04:47 +00:00
LoopDeletion
LoopRotate	Teach loop rotate to hoist trivially invariant instructions	2010-09-06 01:10:22 +00:00
LoopSimplify	Fix LoopSimplify to notify ScalarEvolution when splitting a loop backedge	2010-09-04 02:42:48 +00:00
LoopStrengthReduce	Correct bogus module triple specifications.	2010-08-30 10:48:29 +00:00
LoopUnroll	Revert r113439, which relaxed the requirement that loops containing calls cannot be unrolled. After some discussion,	2010-09-09 20:02:23 +00:00
LoopUnswitch	Factor code for testing whether replacing one value with another	2010-11-18 19:59:41 +00:00
LowerAtomic
LowerInvoke
LowerSetJmp
LowerSwitch
Mem2Reg
MemCpyOpt	enhance memcpyopt to zap memcpy's that have the same src/dst.	2010-12-09 07:45:45 +00:00
MergeFunc
PartialSpecialize	Now using a variant of the existing inlining heuristics to decide whether to create a given specialization of a function in PartialSpecialization. If the total performance bonus across all callsites passing the same constant exceeds the specialization cost, we create the specialization.	2010-10-09 22:06:36 +00:00
PruneEH
Reassociate
ScalarRepl	Treat a call of function pointer like a load of the pointer when considering	2010-11-24 22:04:20 +00:00
SCCP
SimplifyCFG	improve switch formation to handle small range	2010-12-17 06:20:15 +00:00
SimplifyLibCalls	Revert r64460. strtol and friends cannot be marked readonly, even with	2010-12-17 01:09:43 +00:00
Sink	Make BasicAliasAnalysis a normal AliasAnalysis implementation which	2010-10-18 18:04:47 +00:00
SRETPromotion
StripSymbols	DIGlobalVariable can be used to encode debug info for globals that are directly folded into a constant by FE.	2010-08-25 18:52:02 +00:00
TailCallElim	merge two tests.	2010-08-31 18:44:03 +00:00
TailDup	The output of opt -stats must be sent to stderr. Patch by NAKAMURA Takumi!	2010-09-01 18:32:56 +00:00