Chandler Carruth c13c09106e [SCEV] Add some asserts to the recently improved trip count computation ... routines and fix all of the bugs they expose. I hit a test case that crashed even without these asserts due to passing a non-exiting latch to the ExitingBlock parameter of the trip count computation machinery. However, when I add the nice asserts, it turns out we have plenty of coverage of these bugs, they just didn't manifest in crashers. The core problem seems to stem from an assumption that the latch *is* the exiting block. While this is often true, and somewhat the "normal" way to think about loops, it isn't necessarily true. The correct way to call the trip count routines in a *generic* fashion (that is, without a particular exit in mind) is to just use the loop's single exiting block if it has one. The trip count can't be computed generically unless it does. This works great for the loop vectorizer. The loop unroller actually *wants* to select the latch when it has to chose between multiple exits because for unrolling it is the latch trips that matter. But if this is the desire, it needs to explicitly guard for non-exiting latches and check for the generic trip count in that case. I've added the asserts, and added convenience APIs for querying the trip count generically that check for a single exit block. I've kept the APIs consistent between computing trip count and trip multiples. Thansk to Mark for the help debugging and tracking down the *right* fix here! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219550 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-11 00:12:11 +00:00
..
ADT	[ADT] Add an (ADL-friendly) abs free function for APFloat that returns	2014-10-10 08:27:22 +00:00
Analysis	[SCEV] Add some asserts to the recently improved trip count computation	2014-10-11 00:12:11 +00:00
AsmParser	Pass a MemoryBufferRef when we can avoid taking ownership.	2014-08-26 21:49:01 +00:00
Bitcode	Spell out the template args for compilers having issues with the injected class	2014-09-15 16:13:33 +00:00
CodeGen	Add couple of missing 'override' keyword. NFC.	2014-10-10 17:34:30 +00:00
Config	Re-land r219354: Use llvm-symbolizer to symbolize LLVM/Clang crash dumps.	2014-10-10 22:06:59 +00:00
DebugInfo	[dwarfdump] Resolve also variable specifications/abstract_origins.	2014-10-10 15:51:02 +00:00
ExecutionEngine	[MCJIT] Turn the getSymbolAddress free function created in r218626 into a static	2014-10-01 04:11:13 +00:00
IR	Add isInfinity to ConstantFP	2014-10-10 02:15:04 +00:00
IRReader	Pass a MemoryBufferRef when we can avoid taking ownership.	2014-08-26 21:49:01 +00:00
LineEditor
Linker
LTO	unique_ptrify LTOCodeGenerator::NativeObjectFile	2014-09-02 18:21:06 +00:00
MC	don't repeat function name in comments	2014-10-07 17:28:04 +00:00
Object	Object, COFF: Relax aux symbols for section definitions	2014-10-10 06:58:11 +00:00
Option	Add an overload of getLastArgNoClaim taking two OptSpecifiers.	2014-09-12 19:42:53 +00:00
ProfileData	InstrProf: Avoid linear search in a hot loop	2014-10-02 17:14:18 +00:00
Support	Add ApplePropertyString dump helper to Dwarf.{h|cpp}.	2014-10-09 20:43:04 +00:00
TableGen	[TableGen] Fully resolve class-instance values before defs in multiclasses	2014-09-16 17:14:13 +00:00
Target	Remove unused field from Operand	2014-10-09 19:15:18 +00:00
Transforms	[SimplifyCFG] threshold for folding branches with common destination	2014-09-30 22:23:38 +00:00
CMakeLists.txt	Remove llvm_headers_do_not_build for the benefit of XCode and Visual Studio users.	2014-08-14 00:51:47 +00:00
InitializePasses.h	Add a new pass FunctionTargetTransformInfo. This pass serves as a	2014-09-18 00:34:14 +00:00
LinkAllIR.h
LinkAllPasses.h	Make AAMDNodes ctor and operator bool (!!!) explicit, mop up bugs and weirdness exposed by it.	2014-10-04 22:44:29 +00:00
module.modulemap	Nuke MCAnalysis.	2014-09-02 22:32:20 +00:00
module.modulemap.build
Pass.h
PassAnalysisSupport.h
PassInfo.h
PassManager.h
PassRegistry.h	[PM] Remove an unused and rather expensive mapping from an analysis	2014-10-06 00:30:59 +00:00
PassSupport.h