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Hal Finkel dd38c0b876 [DSE] Remove no-data-layout-only type-based overlap checking 
DSE's overlap checking contained special logic, used only when no DataLayout
was available, which inferred a complete overwrite when the pointee types were
equal. This logic seems fine for regular loads/stores, but does not work for
memcpy and friends. Instead of fixing this, I'm just removing it.
Philosophically, transformations should not contain enhanced behavior used only
when data layout is lacking (data layout should be strictly additive), and
maintaining these rarely-tested code paths seems not worthwhile at this stage.

Credit to Aliaksei Zasenka for the bug report and the diagnosis. The test case
(slightly reduced from that provided by Aliaksei) replaces the original
contents of test/Transforms/DeadStoreElimination/no-targetdata.ll -- a few
other tests have been updated to have a data layout.

llvm-svn: 220035
 		2014-10-17 11:56:00 +00:00
..
Analysis [LVI] Add some additional comments about caching and context instructions 2014-10-16 00:40:05 +00:00
AsmParser Make CallingConv::ID an alias of "unsigned". 2014-09-10 18:00:17 +00:00
Bitcode correct const-ness with auto and dyn_cast 2014-10-15 17:45:13 +00:00
CodeGen Reduce code duplication between patchpoint and non-patchpoint lowering. NFC. 2014-10-16 21:26:35 +00:00
DebugInfo Add couple of missing 'override' keyword. NFC. 2014-10-10 17:34:30 +00:00
ExecutionEngine [MCJIT] Replace memcpy with readBytesUnaligned in RuntimeDyldMachOI386. 2014-10-10 23:07:09 +00:00
IR [LLVM-C] Add LLVMInstructionClone. 2014-10-17 01:02:34 +00:00
IRReader Pass a && to getLazyBitcodeModule. 2014-09-03 17:31:46 +00:00
LTO LTO: Document the Boolean argument from r218784 2014-10-02 21:11:04 +00:00
LineEditor [CMake] Use LINK_LIBS instead of target_link_libraries(). 2014-02-26 06:41:29 +00:00
Linker Merge alignment of common GlobalValue. 2014-09-09 17:48:18 +00:00
MC Add back commits r219835 and a fixed version of r219829. 2014-10-17 01:48:58 +00:00
Object Add MachOObjectFile::getUuid() 2014-10-15 23:35:45 +00:00
Option Add an overload of getLastArgNoClaim taking two OptSpecifiers. 2014-09-12 19:42:53 +00:00
ProfileData Reduce double set lookups. NFC. 2014-10-10 15:32:50 +00:00
Support Introduce LLVMParseCommandLineOptions C API function. 2014-10-16 22:47:52 +00:00
TableGen Eliminate some deep std::vector copies. NFC. 2014-10-03 18:33:16 +00:00
Target ARM: Fix a bug which was causing convergence failure in constant-island pass. 2014-10-17 01:31:47 +00:00
Transforms [DSE] Remove no-data-layout-only type-based overlap checking 2014-10-17 11:56:00 +00:00
CMakeLists.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
LLVMBuild.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
Makefile ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00