Philip Reames 6bde9f6994 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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233125 91177308-0d34-0410-b5e6-96231b3b80d8

2015-03-24 22:28:45 +00:00

..

AddDiscriminators.cpp

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ASanStackFrameLayout.cpp

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BasicBlockUtils.cpp

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BreakCriticalEdges.cpp

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BuildLibCalls.cpp

DataLayout is mandatory, update the API to reflect it with references.

2015-03-10 02:37:25 +00:00

BypassSlowDivision.cpp

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CloneFunction.cpp

Fixing a bug with WinEH PHI handling

2015-03-20 21:42:54 +00:00

CloneModule.cpp

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CMakeLists.txt

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CmpInstAnalysis.cpp

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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

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FlattenCFG.cpp

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GlobalStatus.cpp

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InlineFunction.cpp

Inliner should not add callgraph edges for intrinsic calls (PR22857)

2015-03-11 15:12:32 +00:00

InstructionNamer.cpp

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IntegerDivision.cpp

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LCSSA.cpp

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LLVMBuild.txt

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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

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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

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Mem2Reg.cpp

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MetaRenamer.cpp

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ModuleUtils.cpp

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PromoteMemoryToRegister.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

SSAUpdater.cpp

DataLayout is mandatory, update the API to reflect it with references.

2015-03-10 02:37:25 +00:00

SymbolRewriter.cpp

Purge unused includes throughout libSupport.

2015-03-23 18:07:13 +00:00

UnifyFunctionExitNodes.cpp

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Utils.cpp

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ValueMapper.cpp

MapMetadata: Allow unresolved metadata if it won't change

2015-03-17 01:14:40 +00:00