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Duncan P. N. Exon Smith 836f0ddb60 Verifier: Avoid quadratic checking of aggregates for bad bitcasts 
Avoid O(N^2) behaviour when checking for bad bitcasts in `ConstantExpr`s
buried inside of aggregate initializers to `GlobalVariable`s.  I've:
- centralized the "visited" set for recursing through `ConstantExpr`s so
  that expressions are only visited once per Verifier run,
- removed the duplicate logic for the stack visit, and
- avoided recursing into other `GlobalValue`s.

This recovers roughly a 100x time difference in clang compiles of a
particular input file (filled with large cross-referencing tables) that
depends on whether `-disable-llvm-verifier` is on.  This slowdown was
caused by r187506, which introduced these checks.

Now, avoiding `-disable-llvm-verifier` only causes a 2x slowdown for
this case.

(Interestingly, dumping the textual IR for this file starts at least
50GB of global variable initializers (I don't know the total, since I
killed the dump)...)

llvm-svn: 255269
 		2015-12-10 17:56:06 +00:00
..
AsmWriter.cpp Macro debug info support in LLVM IR 2015-12-10 12:56:35 +00:00
AttributeImpl.h llvm/lib/IR/AttributeImpl.h: Move comment block not to cover typedef, introduced in r244164. [-Wdocumentation] 2015-08-06 09:49:17 +00:00
Attributes.cpp [AttributeSet] Overload AttributeSet::addAttribute to reduce compile 2015-12-02 06:58:49 +00:00
AutoUpgrade.cpp Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
BasicBlock.cpp IR: Remove implicit iterator conversions from lib/IR, NFC 2015-10-08 23:49:46 +00:00
CMakeLists.txt Revert r252990. 2015-11-13 01:44:32 +00:00
Comdat.cpp
…
ConstantFold.cpp Remove roundingMode argument in APFloat::mod 2015-09-21 19:29:25 +00:00
ConstantFold.h Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
ConstantRange.cpp [IR] Add a `makeNoWrapRegion` method to `ConstantRange` 2015-10-22 03:12:57 +00:00
Constants.cpp IR: Make ConstantDataArray::getFP actually return a ConstantDataArray 2015-12-09 21:21:07 +00:00
ConstantsContext.h [opaque pointer type] Avoid using pointee types to retrieve InlineAsm's function type 2015-07-28 00:06:38 +00:00
Core.cpp IR: Remove implicit iterator conversions from lib/IR, NFC 2015-10-08 23:49:46 +00:00
DIBuilder.cpp Macro debug info support in LLVM IR 2015-12-10 12:56:35 +00:00
DataLayout.cpp Revert "Add const to a bunch of Type* in DataLayout. NFC." 2015-07-27 17:15:28 +00:00
DebugInfo.cpp DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
DebugInfoMetadata.cpp Macro debug info support in LLVM IR 2015-12-10 12:56:35 +00:00
DebugLoc.cpp IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
DiagnosticInfo.cpp [PGO] Resubmit "MST based PGO instrumentation infrastructure" (r254021) 2015-12-09 18:08:16 +00:00
DiagnosticPrinter.cpp MIR Serialization: Connect the machine function analysis pass to the MIR parser. 2015-06-15 20:30:22 +00:00
Dominators.cpp Constant propagation after hitting assume(cmp) bugfix 2015-09-02 19:59:59 +00:00
Function.cpp Don't copy information from aliasee to alias. 2015-12-02 20:03:17 +00:00
FunctionInfo.cpp [ThinLTO] Handle bitcode without function summary sections gracefully 2015-11-21 21:55:48 +00:00
GCOV.cpp Rename one of our two llvm::GCOVOptions classes to llvm::GCOV::Options. We used 2015-10-14 00:04:19 +00:00
GVMaterializer.cpp
…
Globals.cpp Don't copy information from aliasee to alias. 2015-12-02 20:03:17 +00:00
IRBuilder.cpp Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
IRPrintingPasses.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
InlineAsm.cpp Fix SEGV in InlineAsm::ConstraintInfo::Parse. 2015-09-03 15:41:37 +00:00
Instruction.cpp Add Instruction::getFunction; NFC 2015-12-08 00:13:12 +00:00
Instructions.cpp Add arg_begin() and arg_end() to CallInst and InvokeInst; NFCI 2015-12-10 06:39:02 +00:00
IntrinsicInst.cpp IR: Split Metadata from Value 2014-12-09 18:38:53 +00:00
LLVMBuild.txt
…
LLVMContext.cpp Introduce deoptimization operand bundles 2015-11-11 21:38:02 +00:00
LLVMContextImpl.cpp [IR] Manage TheNoneToken with a std::unique_ptr 2015-11-16 20:55:57 +00:00
LLVMContextImpl.h Macro debug info support in LLVM IR 2015-12-10 12:56:35 +00:00
LegacyPassManager.cpp Remove debug output that snuck into 254957 2015-12-07 22:43:56 +00:00
MDBuilder.cpp [MDBuilder] Simplify code using initializer lists. NFC. 2015-11-22 18:03:17 +00:00
Makefile Revert r252990. 2015-11-13 01:44:32 +00:00
Mangler.cpp Remove unused arguments and move ManglerPrefixTy to the implementation. 2015-06-23 14:11:09 +00:00
Metadata.cpp Preserve load alignment and dereferenceable metadata during some transformations 2015-11-02 17:53:51 +00:00
MetadataImpl.h DI: Disallow uniquable DICompileUnits 2015-08-03 17:26:41 +00:00
MetadataTracking.cpp IR: Store RAUW support and Context in the same pointer, NFC 2015-01-19 19:02:06 +00:00
Module.cpp Interface to attach maximum function count from PGO to module as module flags. 2015-12-03 20:57:37 +00:00
Operator.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
Pass.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
PassManager.cpp [PM] Push the debug option for the new pass manager into the opt tool 2015-01-13 22:42:38 +00:00
PassRegistry.cpp Revert r231276 (including r231277): Add a lock() function in PassRegistry to speed up multi-thread synchronization. 2015-03-05 17:53:00 +00:00
Statepoint.cpp Add invoke related functionality into StatepointSite classes. 2015-02-19 11:02:11 +00:00
SymbolTableListTraitsImpl.h IR: Remove implicit iterator conversions from lib/IR, NFC 2015-10-08 23:49:46 +00:00
Type.cpp [IR] Simplify code. No functionality change. 2015-08-16 21:16:26 +00:00
TypeFinder.cpp IR: Remove implicit iterator conversions from lib/IR, NFC 2015-10-08 23:49:46 +00:00
Use.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
User.cpp [IR] Teach `llvm::User` to co-allocate a descriptor. 2015-09-24 01:00:49 +00:00
Value.cpp Remove handling of AddrSpaceCast in stripAndAccumulateInBoundsConstantOffsets 2015-09-23 19:48:43 +00:00
ValueSymbolTable.cpp Have a single way for creating unique value names. 2015-11-22 00:16:24 +00:00
ValueTypes.cpp Add new vector types for 512-, 1024- and 2048-bit vectors 2015-11-24 13:07:35 +00:00
Verifier.cpp Verifier: Avoid quadratic checking of aggregates for bad bitcasts 2015-12-10 17:56:06 +00:00
module.modulemap
…