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llvm-mirror/test/Transforms
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Hal Finkel e4580bceba Look for a loop's starting location in the llvm.loop metadata 
Getting accurate locations for loops is important, because those locations are
used by the frontend to generate optimization remarks. Currently, optimization
remarks for loops often appear on the wrong line, often the first line of the
loop body instead of the loop itself. This is confusing because that line might
itself be another loop, or might be somewhere else completely if the body was
inlined function call. This happens because of the way we find the loop's
starting location. First, we look for a preheader, and if we find one, and its
terminator has a debug location, then we use that. Otherwise, we look for a
location on an instruction in the loop header.

The fallback heuristic is not bad, but will almost always find the beginning of
the body, and not the loop statement itself. The preheader location search
often fails because there's often not a preheader, and even when there is a
preheader, depending on how it was formed, it sometimes carries the location of
some preceeding code.

I don't see any good theoretical way to fix this problem. On the other hand,
this seems like a straightforward solution: Put the debug location in the
loop's llvm.loop metadata. A companion Clang patch will cause Clang to insert
llvm.loop metadata with appropriate locations when generating debugging
information. With these changes, our loop remarks have much more accurate
locations.

Differential Revision: http://reviews.llvm.org/D19738

llvm-svn: 270771
2016-05-25 21:42:37 +00:00
..
ADCE
AddDiscriminators Revert http://reviews.llvm.org/D19926 as it breaks tests. 2016-05-05 20:47:53 +00:00
AlignmentFromAssumptions
ArgumentPromotion [ArgumentPromotion] Propagate operand bundles to promoted call sites 2016-04-29 04:56:12 +00:00
AtomicExpand
BBVectorize
BDCE [PM] Port BDCE to the new pass manager. 2016-05-25 01:57:04 +00:00
BranchFolding
CodeExtractor
CodeGenPrepare [CodeGenPrepare] Don't sink a cast past its user 2016-04-27 19:36:38 +00:00
ConstantHoisting
ConstantMerge [PM] Port ConstantMerge to the new pass manager. 2016-05-05 00:51:09 +00:00
ConstProp Revert "[SCCP] Partially propagate informations when the input is not fully defined." 2016-05-11 23:06:10 +00:00
CorrelatedValuePropagation Remove extra whitespace. NFC. 2016-05-02 16:45:00 +00:00
CrossDSOCFI
DCE Mark guards on true as "trivially dead" 2016-04-29 22:23:16 +00:00
DeadArgElim [IR] Copy comdats in GlobalObject::copyAttributesFrom 2016-05-25 18:36:22 +00:00
DeadStoreElimination [PM] Port DSE to the new pass manager 2016-05-17 21:38:13 +00:00
EarlyCSE [EarlyCSE] Simplify guard intrinsics 2016-04-29 21:52:58 +00:00
EliminateAvailableExternally [PM] Port EliminateAvailableExternally pass to the new pass manager. 2016-05-05 02:37:32 +00:00
Float2Int
ForcedFunctionAttrs
FunctionAttrs [FunctionAttrs] Volatile loads should disable readonly 2016-05-25 05:53:04 +00:00
FunctionImport ThinLTO: do not import function whose linkage prevents inlining. 2016-05-03 00:27:28 +00:00
GCOVProfiling DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
GlobalDCE [GlobalDCE, Misc] Don't remove functions referenced by ifuncs 2016-05-04 00:20:48 +00:00
GlobalMerge CodeGen: Make the global-merge pass independently testable, and add a test. 2016-05-19 04:38:56 +00:00
GlobalOpt Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
GuardWidening [GuardWidening] Fix incorrect use of remove_if 2016-05-21 02:24:44 +00:00
GVN [GVN] PRE of unordered loads 2016-05-06 21:43:51 +00:00
IndVarSimplify [LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC. 2016-04-19 23:51:52 +00:00
InferFunctionAttrs [TLI] Also cover Linux 64 libfunc (stat64, ...) prototype checking. 2016-05-25 21:16:33 +00:00
Inline Allow -inline-threshold to override default threshold. 2016-05-19 23:02:09 +00:00
InstCombine [X86] Remove the llvm.x86.sse2.storel.dq intrinsic. It hasn't been used in a long time. 2016-05-25 06:56:32 +00:00
InstMerge
InstSimplify [ValueTracking, InstSimplify] extend isKnownNonZero() to handle vector constants 2016-05-24 14:18:49 +00:00
Internalize PM: Port Internalize to the new pass manager 2016-04-26 20:15:52 +00:00
IPConstantProp [PM] Port Interprocedural SCCP to the new pass manager. 2016-05-05 21:05:36 +00:00
IRCE [IRCE] Optimize "uses" not branches; NFCI 2016-05-23 22:16:45 +00:00
JumpThreading [ValueTracking] Improve isImpliedCondition when the dominating cond is false. 2016-04-25 17:23:36 +00:00
LCSSA
LICM [ValueTracking] Use guards to prove non-nullness of a value 2016-05-10 02:35:44 +00:00
LoadCombine
LoopDataPrefetch [LoopDataPrefetch] Add optimization remark 2016-05-05 00:08:15 +00:00
LoopDeletion Use all_of instead of a raw loop; NFC 2016-05-03 17:50:06 +00:00
LoopDistribute [LoopDist] Add missing RUN line in test from r268006 2016-04-29 07:16:00 +00:00
LoopIdiom AMDGPU: Other sizes of popcnt are fast 2016-05-18 16:10:19 +00:00
LoopInterchange
LoopLoadElim
LoopReroll Enable loopreroll for sext of loop control only IV 2016-05-10 21:16:49 +00:00
LoopRotate LPM: Drop require<loops> from these tests, it's redundant. NFC 2016-05-10 18:28:10 +00:00
LoopSimplify
LoopSimplifyCFG LPM: Drop require<loops> from these tests, it's redundant. NFC 2016-05-10 18:28:10 +00:00
LoopStrengthReduce AMDGPU: Fix a few slightly broken tests 2016-05-18 15:48:44 +00:00
LoopUnroll Re-enable "[LoopUnroll] Enable advanced unrolling analysis by default" one more time. 2016-05-24 23:00:05 +00:00
LoopUnswitch
LoopVectorize Look for a loop's starting location in the llvm.loop metadata 2016-05-25 21:42:37 +00:00
LoopVersioning
LoopVersioningLICM [LoopVersioningLICM] Add test coverage for llvm.loop.licm_versioning.disable 2016-04-22 18:34:50 +00:00
LowerAtomic [PM] Port LowerAtomic to the new pass manager. 2016-05-13 22:52:35 +00:00
LowerBitSets
LowerExpectIntrinsic [LowerExpectIntrinsic] make default likely/unlikely ratio bigger 2016-04-26 22:23:38 +00:00
LowerGuardIntrinsic [Guards] Add branch metadata when lowering 2016-05-17 17:51:19 +00:00
LowerInvoke
LowerSwitch
Mem2Reg
MemCpyOpt [MemCpyOpt] Use MaxIntSize in byte instead of bit 2016-05-13 16:52:24 +00:00
MergeFunc Functions with differing phis should not be merged. 2016-05-20 18:39:11 +00:00
MetaRenamer
NameAnonFunctions
NaryReassociate
ObjCARC
PartiallyInlineLibCalls
PGOProfile [PM] Port indirect call promotion pass to new pass manager 2016-05-16 16:31:07 +00:00
PhaseOrdering Mark that SpeculativeExecution preserves Globals Alias Analysis. 2016-05-03 08:33:26 +00:00
PlaceSafepoints
PreISelIntrinsicLowering Introduce llvm.load.relative intrinsic. 2016-04-22 21:18:02 +00:00
PruneEH
Reassociate PM: Port Reassociate to the new pass manager 2016-04-26 23:39:29 +00:00
Reg2Mem
RewriteStatepointsForGC [RewriteStatepointsForGC] Remove obsolete assertion 2016-05-17 13:54:10 +00:00
SafeStack DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
SampleProfile Tune basic block annotation algorithm. 2016-04-26 04:59:11 +00:00
Scalarizer
ScalarRepl
SCCP [PM] Port per-function SCCP to the new pass manager. 2016-05-18 15:18:25 +00:00
SeparateConstOffsetFromGEP
SimplifyCFG [SimplifyCFG] Remove cleanuppads which are empty except for calls to lifetime.end 2016-05-21 05:12:32 +00:00
Sink PM: Port SinkingPass to the new pass manager 2016-04-22 19:54:10 +00:00
SLPVectorizer [SLPVectorizer][X86] Regenerated SEXT/ZEXT cast vectorization tests 2016-05-06 22:22:18 +00:00
SpeculativeExecution
SROA [SROA] Function canConvertValue needs to check whether both NewTy and OldTy pointers are 2016-05-03 19:30:48 +00:00
StraightLineStrengthReduce
StripDeadPrototypes
StripSymbols Refactor stripDebugInfo(Function) to handle intrinsic 2016-05-07 04:10:52 +00:00
StructurizeCFG
TailCallElim
Util [BasicAA] Treat llvm.assume as not accessing memory in getModRefBehavior(Function) 2016-04-29 17:18:28 +00:00
WholeProgramDevirt