llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 15:11:24 +00:00

History

Nick Lewycky f201a06662 Factor out the multiply analysis code in ComputeMaskedBits and apply it to the overflow checking multiply intrinsic as well. Add a test for this, updating the test from grep to FileCheck. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153028 91177308-0d34-0410-b5e6-96231b3b80d8		2012-03-18 23:28:48 +00:00
..
IPA
AliasAnalysis.cpp	Move isKnownNonNull from private implementation detail of BasicAA to a public	2012-02-25 10:56:28 +00:00
AliasAnalysisCounter.cpp	Persuade GCC that there is nothing worth warning about here (there isn't).	2012-02-05 14:20:11 +00:00
AliasAnalysisEvaluator.cpp	Remove unnecessary default cases in switches that cover all enum values.	2012-01-10 16:47:17 +00:00
AliasDebugger.cpp
AliasSetTracker.cpp	Have AliasSet::aliasesUnknownInst use pointer TBAA info when available	2012-02-10 15:52:39 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp	Duncan pointed out that if the alignment isn't explicitly specified, it defaults to the ABI alignment. Given that, make this code a bit more aggressive in such cases.	2012-02-27 23:16:46 +00:00
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp	Move includes to the .cpp file.	2012-01-17 22:16:31 +00:00
CFGPrinter.cpp
CMakeLists.txt	Pull the implementation of the code metrics out of the inline cost	2012-03-16 05:51:52 +00:00
CodeMetrics.cpp	Pull the implementation of the code metrics out of the inline cost	2012-03-16 05:51:52 +00:00
ConstantFolding.cpp	Convert assert(0) to llvm_unreachable	2012-02-07 05:05:23 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp	Do the right thing on NULL uint64 fields.	2012-03-16 00:21:54 +00:00
DIBuilder.cpp	Add support for runtime languages on our forward declarations.	2012-02-20 18:04:14 +00:00
DominanceFrontier.cpp
DomPrinter.cpp	remove the blank line from previous ci.	2012-02-04 03:18:47 +00:00
InlineCost.cpp	Start removing the use of an ad-hoc 'never inline' set and instead	2012-03-16 06:10:13 +00:00
InstCount.cpp
InstructionSimplify.cpp	Type sizes and fields offsets inside structs are unsigned. This is a highly	2012-03-15 20:14:42 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	LSR fix: Add isSimplifiedLoopNest to IVUsers analysis.	2012-03-16 03:16:56 +00:00
LazyValueInfo.cpp	llvm::SwitchInst	2012-03-11 06:09:17 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LLVMBuild.txt
Loads.cpp	enhance jump threading to preserve TBAA information when PRE'ing loads,	2012-03-13 18:07:41 +00:00
LoopDependenceAnalysis.cpp	More dead code removal (using -Wunreachable-code)	2012-01-20 21:51:11 +00:00
LoopInfo.cpp
LoopPass.cpp
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	Don't call dominates on unreachable instructions. Should fix the dragonegg	2012-02-26 05:30:08 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PathNumbering.cpp	[unwind removal] We no longer have 'unwind' instructions being generated, so	2012-02-06 21:16:41 +00:00
PathProfileInfo.cpp
PathProfileVerifier.cpp
PHITransAddr.cpp	Uniformize the InstructionSimplify interface by ensuring that all routines	2012-03-13 11:42:19 +00:00
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp	Remove extra semi-colons.	2012-02-22 17:25:00 +00:00
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	switch SCEV to use the new ConstantFoldLoadThroughGEPIndices function	2012-01-24 05:49:24 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Fix this assert. IP can point to an instruction with strange dominance	2012-02-27 02:13:03 +00:00
ScalarEvolutionNormalization.cpp	More dead code removal (using -Wunreachable-code)	2012-01-20 21:51:11 +00:00
SparsePropagation.cpp	Taken into account Duncan's comments for r149481 dated by 2nd Feb 2012:	2012-03-08 07:06:20 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Factor out the multiply analysis code in ComputeMaskedBits and apply it to the	2012-03-18 23:28:48 +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))

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