llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-17 21:35:07 +00:00

History

Andrew Trick 06988bcf6a Made SCEV's UDiv expressions more canonical. When dividing a

recurrence, the initial values low bits can sometimes be ignored.

To take advantage of this, added FoldIVUser to IndVarSimplify to fold
an IV operand into a udiv/lshr if the operator doesn't affect the
result.

-indvars -disable-iv-rewrite now transforms

i = phi i4
i1 = i0 + 1
idx = i1 >> (2 or more)
i4 = i + 4

into

i = phi i4
idx = i0 >> ...
i4 = i + 4


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137013 91177308-0d34-0410-b5e6-96231b3b80d8

2011-08-06 07:00:37 +00:00

IPA

Rewrite the CMake build to use explicit dependencies between libraries,

2011-07-29 00:14:25 +00:00

AliasAnalysis.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

AliasAnalysisCounter.cpp

Teach AliasAnalysisCounter about PartialAlias.

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

AliasAnalysisEvaluator.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

AliasDebugger.cpp

…

AliasSetTracker.cpp

Minor simplification.

2011-07-27 01:02:25 +00:00

Analysis.cpp

Rename BlockFrequency to BlockFrequencyInfo and MachineBlockFrequency to

2011-07-25 19:25:40 +00:00

BasicAliasAnalysis.cpp

Explicitly cast narrowing conversions inside {}s that will become errors in

2011-07-27 06:22:51 +00:00

BlockFrequencyInfo.cpp

Add more constantness in BlockFrequencyInfo.

2011-08-03 21:30:57 +00:00

BranchProbabilityInfo.cpp

Change SmallVector to SmallPtrSet in BranchProbabilityInfo. Handle cases where

2011-08-01 19:16:26 +00:00

CaptureTracking.cpp

Don't include Operator.h from InstrTypes.h.

2011-04-11 09:35:34 +00:00

CFGPrinter.cpp

…

CMakeLists.txt

Rewrite the CMake build to use explicit dependencies between libraries,

2011-07-29 00:14:25 +00:00

ConstantFolding.cpp

Convert GetElementPtrInst to use ArrayRef.

2011-07-25 09:48:08 +00:00

DbgInfoPrinter.cpp

Move DbgInfoPrinter specific utlities inside DbgInfoPrinter.cpp

2011-02-15 17:36:11 +00:00

DebugInfo.cpp

Temporarily revert r135528 which distinguishes between two copies of one

2011-08-05 00:51:31 +00:00

DIBuilder.cpp

Reapply r135457. This needs llvm-gcc change, that I forgot to check-in yesterday.

2011-07-19 19:41:54 +00:00

DominanceFrontier.cpp

Move DominanceFrontier from VMCore to Analysis.

2011-01-18 06:06:27 +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

Change condition for determining whether a function is small for inlining metrics so that very long functions

2011-05-24 20:22:24 +00:00

InstCount.cpp

…

InstructionSimplify.cpp

Fix what seems an obvious typo. Patch by Ivan Krasin. Problem

2011-08-04 10:02:21 +00:00

Interval.cpp

…

IntervalPartition.cpp

…

IVUsers.cpp

Teach IVUsers to stop at non-affine expressions unless they are both

2011-07-01 22:05:19 +00:00

LazyValueInfo.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

LibCallAliasAnalysis.cpp

…

LibCallSemantics.cpp

…

Lint.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

Loads.cpp

Convert TargetData::getIndexedOffset to use ArrayRef.

2011-07-19 14:01:37 +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

Reverting r136884 updateUnloop, which crashed a linux builder.

2011-08-04 01:04:37 +00:00

LoopPass.cpp

Reverting r136884 updateUnloop, which crashed a linux builder.

2011-08-04 01:04:37 +00:00

Makefile

…

MemDepPrinter.cpp

Add "unknown" results for memdep, which mean "I don't know whether a dependence for the given instruction exists in the given block". This cleans up all the existing hacks in memdep which represent this concept by returning clobber with various unrelated instructions.

2011-06-15 00:47:34 +00:00

MemoryBuiltins.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

MemoryDependenceAnalysis.cpp

land David Blaikie's patch to de-constify Type, with a few tweaks.

2011-07-18 04:54:35 +00:00

ModuleDebugInfoPrinter.cpp

…

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

PathNumbering.cpp

Add this back in for now. There are still a few passes which create unwind instructions at the moment.

2011-08-03 01:07:57 +00:00

PathProfileInfo.cpp

Implementation of path profiling.

2011-01-29 01:09:53 +00:00

PathProfileVerifier.cpp

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

PHITransAddr.cpp

Shorten some expressions by using ArrayRef::slice().

2011-07-25 15:13:01 +00:00

PostDominators.cpp

remove postdom frontiers, because it is dead. Forward dom frontiers are

2011-04-05 21:57:17 +00:00

ProfileEstimatorPass.cpp

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

ProfileInfo.cpp

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

ProfileInfoLoader.cpp

Remove unused STL header includes.

2011-04-23 19:53:52 +00:00

ProfileInfoLoaderPass.cpp

…

ProfileVerifierPass.cpp

…

README.txt

…

RegionInfo.cpp

Region: Allow user control the printing style of the print function.

2011-04-04 07:19:18 +00:00

RegionPass.cpp

Minor change: Fix the typo in RegionPass.h and RegionPass.cpp.

2011-05-05 13:59:38 +00:00

RegionPrinter.cpp

RegionPrinter: Ignore back edges when layouting the graph

2011-02-27 04:11:07 +00:00

ScalarEvolution.cpp

Made SCEV's UDiv expressions more canonical. When dividing a

2011-08-06 07:00:37 +00:00

ScalarEvolutionAliasAnalysis.cpp

…

ScalarEvolutionExpander.cpp

Convert IRBuilder::CreateGEP and IRBuilder::CreateInBoundsGEP to use

2011-07-22 08:16:57 +00:00

ScalarEvolutionNormalization.cpp

Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrap

2011-03-14 16:50:06 +00:00

SparsePropagation.cpp

…

Trace.cpp

…

TypeBasedAliasAnalysis.cpp

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

ValueTracking.cpp

Migrate LLVM and Clang to use the new makeArrayRef(...) functions where previously explicit non-default constructors were used.

2011-07-18 12:00:32 +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))

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