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llvm-project/llvm/lib/Transforms/Utils
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Philip Reames 2b969d7010 Merge empty landing pads in SimplifyCFG 
This patch tries to merge duplicate landing pads when they branch to a common shared target.

Given IR that looks like this:
lpad1:
  %exn = landingpad {i8*, i32} personality i32 (...)* @__gxx_personality_v0
         cleanup
  br label %shared_resume
lpad2:
  %exn2 = landingpad {i8*, i32} personality i32 (...)* @__gxx_personality_v0
          cleanup
  br label %shared_resume
shared_resume:
  call void @fn()
  ret void
}

We can rewrite the users of both landing pad blocks to use one of them. This will generally allow the shared_resume block to be merged with the common landing pad as well.

Without this change, tail duplication would likely kick in - creating N (2 in this case) copies of the shared_resume basic block.

Differential Revision: http://reviews.llvm.org/D8297

llvm-svn: 233125
 		2015-03-24 22:28:45 +00:00
..
ASanStackFrameLayout.cpp [asan] Reuse a common function. 2015-02-16 14:49:37 +00:00
AddDiscriminators.cpp IR: Split Metadata from Value 2014-12-09 18:38:53 +00:00
BasicBlockUtils.cpp Teach SplitBlockPredecessors how to handle landingpad blocks. 2015-01-28 23:06:47 +00:00
BreakCriticalEdges.cpp [PM] Remove the Pass argument from all of the critical edge splitting 2015-01-19 12:09:11 +00:00
BuildLibCalls.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
BypassSlowDivision.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
CMakeLists.txt Use ADDITIONAL_HEADER_DIRS in all LLVM CMake projects. 2015-02-11 03:28:02 +00:00
CloneFunction.cpp Fixing a bug with WinEH PHI handling 2015-03-20 21:42:54 +00:00
CloneModule.cpp Remove a bad cast in CloneModule() 2014-12-23 08:23:45 +00:00
CmpInstAnalysis.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
CodeExtractor.cpp [opaque pointer type] Start migrating GEP creation to explicitly specify the pointee type 2015-03-14 01:53:18 +00:00
CtorUtils.cpp [ctorutils] Update and sort includes. NFC. 2015-03-23 19:06:17 +00:00
DemoteRegToStack.cpp Fix a bug in DemoteRegToStack where a reload instruction was inserted into the 2015-02-09 06:38:23 +00:00
FlattenCFG.cpp utils: Fix segfault in flattencfg 2014-08-13 20:31:53 +00:00
GlobalStatus.cpp Update SetVector to rely on the underlying set's insert to return a pair<iterator, bool> 2014-11-19 07:49:26 +00:00
InlineFunction.cpp Inliner should not add callgraph edges for intrinsic calls (PR22857) 2015-03-11 15:12:32 +00:00
InstructionNamer.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 09:10:37 +00:00
IntegerDivision.cpp Fix heap-use-after-free bug in expandSDiv when the operands are 2014-11-05 21:28:24 +00:00
LCSSA.cpp [PM] Split the LoopInfo object apart from the legacy pass, creating 2015-01-17 14:16:18 +00:00
LLVMBuild.txt Update libdeps since TLI was moved from Target to Analysis in r226078. 2015-01-15 05:21:00 +00:00
Local.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopSimplify.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopUnroll.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopUnrollRuntime.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
LowerInvoke.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
LowerSwitch.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
Makefile
…
Mem2Reg.cpp [PM] Split the AssumptionTracker immutable pass into two separate APIs: 2015-01-04 12:03:27 +00:00
MetaRenamer.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 09:10:37 +00:00
ModuleUtils.cpp Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size. 2014-08-21 05:55:13 +00:00
PromoteMemoryToRegister.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
SSAUpdater.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
SimplifyCFG.cpp Merge empty landing pads in SimplifyCFG 2015-03-24 22:28:45 +00:00
SimplifyIndVar.cpp [IndVarSimplify] use the "canonical" way to infer no-wrap. 2015-03-04 22:24:23 +00:00
SimplifyInstructions.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
SimplifyLibCalls.cpp [SimplifyLibCalls] Fix negative shifts being produced by the memchr -> bitfield transform. 2015-03-21 22:04:26 +00:00
SymbolRewriter.cpp Purge unused includes throughout libSupport. 2015-03-23 18:07:13 +00:00
UnifyFunctionExitNodes.cpp [LPM] Stop using the string based preservation API. It is an 2015-01-28 04:57:56 +00:00
Utils.cpp Pass to emit DWARF path discriminators. 2014-03-03 20:06:11 +00:00
ValueMapper.cpp MapMetadata: Allow unresolved metadata if it won't change 2015-03-17 01:14:40 +00:00