llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-02 07:11:49 +00:00

History

Preston Briggs a4eff77e37 Modified dump() to provide a little more information for dependences between instructions that don't share a common loop. Updated the test results appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168965 91177308-0d34-0410-b5e6-96231b3b80d8		2012-11-30 00:44:47 +00:00
..
IPA	Add doInitialization and doFinalization methods to ModulePass's, to allow them to be re-initialized and reused on multiple Module's.	2012-11-15 00:14:15 +00:00
AliasAnalysis.cpp	Use the attribute enums to query if a parameter has an attribute.	2012-10-09 21:38:14 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp	Move TargetData to DataLayout.	2012-10-08 16:38:25 +00:00
Analysis.cpp	Add a cost model analysis that allows us to estimate the cost of IR-level instructions.	2012-11-02 21:48:17 +00:00
BasicAliasAnalysis.cpp	Phi speculation improvement for BasicAA	2012-11-17 02:33:15 +00:00
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp	BranchProb: modify the definition of an edge in BranchProbabilityInfo to handle	2012-08-24 18:14:27 +00:00
CaptureTracking.cpp	Give CaptureTracker::shouldExplore a base implementation. Most users want to do	2012-10-08 22:12:48 +00:00
CFGPrinter.cpp
CMakeLists.txt	Add a cost model analysis that allows us to estimate the cost of IR-level instructions.	2012-11-02 21:48:17 +00:00
CodeMetrics.cpp	Revert the majority of the next patch in the address space series:	2012-11-01 09:14:31 +00:00
ConstantFolding.cpp	llvm/ConstantFolding.cpp: Make ReadDataFromGlobal() and FoldReinterpretLoadFromConstPtr() Big-endian-aware.	2012-11-08 20:34:25 +00:00
CostModel.cpp	CostModel: add support for Vector Insert and Extract.	2012-11-02 22:31:56 +00:00
DbgInfoPrinter.cpp	Move lib/Analysis/DebugInfo.cpp to lib/VMCore/DebugInfo.cpp and	2012-06-28 00:05:13 +00:00
DependenceAnalysis.cpp	Modified dump() to provide a little	2012-11-30 00:44:47 +00:00
DominanceFrontier.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
DomPrinter.cpp
InlineCost.cpp	Clean up handling of always-inline functions in the inliner.	2012-11-19 07:04:35 +00:00
InstCount.cpp
InstructionSimplify.cpp	Fast-math optimization: fold multiply by zero	2012-11-27 00:46:26 +00:00
Interval.cpp	Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767	2012-09-27 10:14:43 +00:00
IntervalPartition.cpp
IVUsers.cpp	Move TargetData to DataLayout.	2012-10-08 16:38:25 +00:00
LazyValueInfo.cpp	Hoist out some work done inside a loop doing a linear scan over all	2012-10-26 04:43:47 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	Revert the series of commits starting with r166578 which introduced the	2012-11-01 08:07:29 +00:00
LLVMBuild.txt
Loads.cpp	Move TargetData to DataLayout.	2012-10-08 16:38:25 +00:00
LoopInfo.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
LoopPass.cpp	Enable the new LoopInfo algorithm by default.	2012-06-26 04:11:38 +00:00
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp	Revert the series of commits starting with r166578 which introduced the	2012-11-01 08:07:29 +00:00
MemoryDependenceAnalysis.cpp	Ignore unreachable blocks when doing memory dependence analysis on non-local	2012-10-23 18:37:11 +00:00
ModuleDebugInfoPrinter.cpp	Move lib/Analysis/DebugInfo.cpp to lib/VMCore/DebugInfo.cpp and	2012-06-28 00:05:13 +00:00
NoAliasAnalysis.cpp	Move TargetData to DataLayout.	2012-10-08 16:38:25 +00:00
PathNumbering.cpp	Move llvm/Support/TypeBuilder.h -> llvm/TypeBuilder.h. This completes	2012-07-15 23:45:24 +00:00
PathProfileInfo.cpp
PathProfileVerifier.cpp
PHITransAddr.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
PostDominators.cpp
ProfileDataLoader.cpp	Remove code to saturate profile counts.	2012-10-29 17:27:39 +00:00
ProfileDataLoaderPass.cpp	Cleanups due to feedback. No functionality change. Patch by Alistair.	2012-08-31 05:18:31 +00:00
ProfileEstimatorPass.cpp	Fix floating-point divide by zero, in a case where the value was not going to be used anyway.	2012-08-24 00:31:45 +00:00
ProfileInfo.cpp	Profile: set branch weight metadata with data generated from profiling.	2012-08-28 22:21:25 +00:00
ProfileInfoLoader.cpp	Remove unused private member variables uncovered by the recent changes to clang's -Wunused-private-field.	2012-07-20 22:05:57 +00:00
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
RegionPass.cpp	Remove the the block_node_iterator of Region, replace it by the block_iterator.	2012-08-27 13:49:24 +00:00
RegionPrinter.cpp
ScalarEvolution.cpp	Follow up to 168711: It's safe to base this analysis on the found compare, just return the value for the right predicate.	2012-11-29 19:07:57 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Revert the series of commits starting with r166578 which introduced the	2012-11-01 08:07:29 +00:00
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
Trace.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Revert the majority of the next patch in the address space series:	2012-11-01 09:14:31 +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))

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