llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-25 00:33:15 +00:00

History

Chris Lattner 8cd4efb6a5 implement constant folding support for an exotic constant expr:

ret i64 ptrtoint (i8* getelementptr ([1000 x i8]* @X, i64 1, i64 sub (i64 0, i64 ptrtoint ([1000 x i8]* @X to i64))) to i64)

to "ret i64 1000".  This allows us to correctly compute the trip count
on a loop in PR8883, which occurs with std::fill on a char array.  This
allows us to transform it into a memset with a constant size.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122950 91177308-0d34-0410-b5e6-96231b3b80d8

2011-01-06 06:19:46 +00:00

IPA

Use the new addEscapingValue callback to update GlobalsModRef when GVN adds PHIs of GEPs. For the moment,

2011-01-03 23:51:43 +00:00

AliasAnalysis.cpp

Stub out a new updating interface to AliasAnalysis, allowing stateful analyses to be informed when

2011-01-03 21:38:41 +00:00

AliasAnalysisCounter.cpp

Teach AliasAnalysisCounter about PartialAlias.

2010-12-10 19:53:05 +00:00

AliasAnalysisEvaluator.cpp

Teach AliasAnalysisEvaluator about PartialAlias.

2010-12-10 19:52:40 +00:00

AliasDebugger.cpp

Extend the AliasAnalysis::pointsToConstantMemory interface to allow it

2010-11-08 16:45:26 +00:00

AliasSetTracker.cpp

Update this code to handle PartialAlias as MayAlias.

2010-12-10 19:40:47 +00:00

Analysis.cpp

Add initialization routines for Analysis and IPA.

2010-10-07 18:31:00 +00:00

BasicAliasAnalysis.cpp

fix rdar://8813415 - a miscompilation of 164.gzip that loop-idiom

2011-01-03 21:03:33 +00:00

CaptureTracking.cpp

VAArg doesn't capture its operand.

2010-11-09 20:09:35 +00:00

CFGPrinter.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

CMakeLists.txt

Introduce DIBuilder. It is intended to be a front-end friendly interface to emit debuggging information entries in LLVM IR.

2010-11-04 15:01:38 +00:00

ConstantFolding.cpp

implement constant folding support for an exotic constant expr:

2011-01-06 06:19:46 +00:00

DbgInfoPrinter.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

DebugInfo.cpp

Add support to create class type.

2010-12-08 20:18:20 +00:00

DIBuilder.cpp

Use type's file info while describing inheritance relationship.

2010-12-08 21:46:37 +00:00

DomPrinter.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

InlineCost.cpp

Now using a variant of the existing inlining heuristics to decide whether to create a given specialization of a function in PartialSpecialization. If the total performance bonus across all callsites passing the same constant exceeds the specialization cost, we create the specialization.

2010-10-09 22:06:36 +00:00

InstCount.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

InstructionSimplify.cpp

Revert commit 122654 at the request of Chris, who reckons that instsimplify

2011-01-01 20:08:02 +00:00

Interval.cpp

…

IntervalPartition.cpp

Now with fewer extraneous semicolons!

2010-10-07 22:25:06 +00:00

IVUsers.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

LazyValueInfo.cpp

Reorder, rename, and document some members to make this easier to follow.

2011-01-05 23:26:22 +00:00

LibCallAliasAnalysis.cpp

Now with fewer extraneous semicolons!

2010-10-07 22:25:06 +00:00

LibCallSemantics.cpp

Thread const correctness through a bunch of AliasAnalysis interfaces and

2010-08-03 21:48:53 +00:00

Lint.cpp

Move Value::getUnderlyingObject to be a standalone

2010-12-15 20:02:24 +00:00

LiveValues.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

Loads.cpp

Move Value::getUnderlyingObject to be a standalone

2010-12-15 20:02:24 +00:00

LoopDependenceAnalysis.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

LoopInfo.cpp

Fix typo pointed out by Trevor Harmon.

2010-11-13 12:16:27 +00:00

LoopPass.cpp

zap dead code.

2010-09-04 18:12:00 +00:00

Makefile

…

MemDepPrinter.cpp

Add helper functions for computing the Location of load, store,

2010-11-11 21:50:19 +00:00

MemoryBuiltins.cpp

…

MemoryDependenceAnalysis.cpp

Change all self assignments X=X to (void)X, so that we can turn on a

2010-12-23 00:58:24 +00:00

ModuleDebugInfoPrinter.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

NoAliasAnalysis.cpp

Use the new addEscapingValue callback to update GlobalsModRef when GVN adds PHIs of GEPs. For the moment,

2011-01-03 23:51:43 +00:00

PHITransAddr.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

PostDominators.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

ProfileEstimatorPass.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

ProfileInfo.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

ProfileInfoLoader.cpp

…

ProfileInfoLoaderPass.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

ProfileVerifierPass.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

README.txt

…

RegionInfo.cpp

split dom frontier handling stuff out to its own DominanceFrontier header,

2011-01-02 22:09:33 +00:00

RegionPass.cpp

Remove useless dynamic_cast<>().

2010-12-12 21:58:28 +00:00

RegionPrinter.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

ScalarEvolution.cpp

PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and

2010-12-07 08:25:19 +00:00

ScalarEvolutionAliasAnalysis.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

ScalarEvolutionExpander.cpp

Introduce memoization for ScalarEvolution dominates and properlyDominates

2010-11-18 00:34:22 +00:00

ScalarEvolutionNormalization.cpp

Disable the asserts that check that normalization is perfectly

2010-09-03 22:12:56 +00:00

SparsePropagation.cpp

…

Trace.cpp

…

TypeBasedAliasAnalysis.cpp

Update a comment.

2010-12-16 02:55:10 +00:00

ValueTracking.cpp

fix an off-by-one bug that caused a crash analyzing

2011-01-04 18:19:15 +00:00

README.txt

Analysis Opportunities:

//===---------------------------------------------------------------------===//

In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
ScalarEvolution expression for %r is this:

  {1,+,3,+,2}<loop>

Outside the loop, this could be evaluated simply as (%n * %n), however
ScalarEvolution currently evaluates it as

  (-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))

In addition to being much more complicated, it involves i65 arithmetic,
which is very inefficient when expanded into code.

//===---------------------------------------------------------------------===//

In formatValue in test/CodeGen/X86/lsr-delayed-fold.ll,

ScalarEvolution is forming this expression:

((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32)))

This could be folded to

(-1 * (trunc i64 undef to i32))

//===---------------------------------------------------------------------===//