llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-01 17:32:36 +00:00

History

Andrew Trick 6f71dd765a Remove a bunch of old SCEVExpander FIXME's for preserving NoWrap.

The great thing about the SCEVAddRec No-Wrap flag (unlike nsw/nuw) is
that is can be preserved while normalizing (reassociating and
factoring).

The bad thing is that is can't be tranfered back to IR, which is one
of the reasons I don't like the concept of SCEVExpander.

Sorry, I can't think of a direct way to test this, which is why these
were FIXMEs for so long. I just think it's a good time to finally
clean it up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186273 91177308-0d34-0410-b5e6-96231b3b80d8

2013-07-14 03:10:08 +00:00

IPA

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AliasAnalysis.cpp

Eliminate trivial redundant loads across nocapture+readonly calls to uncaptured

2013-07-07 10:15:16 +00:00

AliasAnalysisCounter.cpp

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AliasAnalysisEvaluator.cpp

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AliasDebugger.cpp

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AliasSetTracker.cpp

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Analysis.cpp

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BasicAliasAnalysis.cpp

Make BasicAliasAnalysis recognize the fact a noalias argument cannot alias another argument, even if the other argument is not itself marked noalias.

2013-05-28 08:17:48 +00:00

BlockFrequencyInfo.cpp

BlockFrequency: Bump up the entry frequency a bit.

2013-06-25 13:34:40 +00:00

BranchProbabilityInfo.cpp

Use SmallVectorImpl::iterator/const_iterator instead of SmallVector to avoid specifying the vector size.

2013-07-04 01:31:24 +00:00

CaptureTracking.cpp

Extend 'readonly' and 'readnone' to work on function arguments as well as

2013-07-06 00:29:58 +00:00

CFGPrinter.cpp

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CMakeLists.txt

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CodeMetrics.cpp

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ConstantFolding.cpp

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CostModel.cpp

Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.

2013-07-11 16:22:38 +00:00

DependenceAnalysis.cpp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185187 91177308-0d34-0410-b5e6-96231b3b80d8

2013-06-28 18:44:48 +00:00

DominanceFrontier.cpp

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DomPrinter.cpp

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InstCount.cpp

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InstructionSimplify.cpp

Fix logic error optimizing "icmp pred (urem X, Y), Y" where pred is signed.

2013-07-12 23:42:57 +00:00

Interval.cpp

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IntervalPartition.cpp

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IVUsers.cpp

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LazyValueInfo.cpp

Use SmallVectorImpl::iterator/const_iterator instead of SmallVector to avoid specifying the vector size.

2013-07-04 01:31:24 +00:00

LibCallAliasAnalysis.cpp

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LibCallSemantics.cpp

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Lint.cpp

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LLVMBuild.txt

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Loads.cpp

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LoopInfo.cpp

Add support for llvm.vectorizer metadata

2013-05-28 20:00:34 +00:00

LoopPass.cpp

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Makefile

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MemDepPrinter.cpp

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MemoryBuiltins.cpp

Added support for the Builtin attribute.

2013-06-27 00:25:01 +00:00

MemoryDependenceAnalysis.cpp

Fix xemacs mode line, don't put them in .cpp files (just header files). No

2013-06-10 23:10:59 +00:00

ModuleDebugInfoPrinter.cpp

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NoAliasAnalysis.cpp

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PathNumbering.cpp

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PathProfileInfo.cpp

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PathProfileVerifier.cpp

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PHITransAddr.cpp

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PostDominators.cpp

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ProfileDataLoader.cpp

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ProfileDataLoaderPass.cpp

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ProfileEstimatorPass.cpp

Use SmallVectorImpl::iterator/const_iterator instead of SmallVector to avoid specifying the vector size.

2013-07-04 01:31:24 +00:00

ProfileInfo.cpp

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ProfileInfoLoader.cpp

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ProfileInfoLoaderPass.cpp

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ProfileVerifierPass.cpp

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PtrUseVisitor.cpp

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README.txt

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RegionInfo.cpp

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RegionPass.cpp

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RegionPrinter.cpp

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ScalarEvolution.cpp

Stylistic change.

2013-07-12 07:25:38 +00:00

ScalarEvolutionAliasAnalysis.cpp

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ScalarEvolutionExpander.cpp

Remove a bunch of old SCEVExpander FIXME's for preserving NoWrap.

2013-07-14 03:10:08 +00:00

ScalarEvolutionNormalization.cpp

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SparsePropagation.cpp

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TargetTransformInfo.cpp

TargetTransformInfo: address calculation parameter for gather/scather

2013-07-12 19:16:02 +00:00

Trace.cpp

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TypeBasedAliasAnalysis.cpp

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ValueTracking.cpp

Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.

2013-07-11 16:22:38 +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))

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