llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-02 02:55:35 +00:00

History

Hal Finkel 2a77e6bdd1 [CFL-AA] CFL-AA should not assert on an va_arg instruction The CFL-AA implementation was missing a visit* routine for va_arg instructions, causing it to assert when run on a function that had one. For now, handle these in a conservative way. Fixes PR20954. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219718 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-14 20:51:26 +00:00
..
IPA
AliasAnalysis.cpp	Make AAMDNodes ctor and operator bool (!!!) explicit, mop up bugs and weirdness exposed by it.	2014-10-04 22:44:29 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
AssumptionTracker.cpp	AssumptionTracker: Don't create temporary CallbackVHs.	2014-10-11 19:13:01 +00:00
BasicAliasAnalysis.cpp	Revert "[BasicAA] Revert "Revert r218714 - Make better use of zext and sign information.""	2014-10-09 19:48:12 +00:00
BlockFrequencyInfo.cpp
BlockFrequencyInfoImpl.cpp	[modules] Stop excluding Support/Debug.h from the Support module. This header	2014-10-13 00:41:03 +00:00
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFG.cpp
CFGPrinter.cpp
CFLAliasAnalysis.cpp	[CFL-AA] CFL-AA should not assert on an va_arg instruction	2014-10-14 20:51:26 +00:00
CGSCCPassManager.cpp
CMakeLists.txt	Add file to CMake build as well.	2014-09-18 00:39:20 +00:00
CodeMetrics.cpp
ConstantFolding.cpp	Remove duplicate function names from comments. NFC.	2014-10-02 15:13:22 +00:00
CostModel.cpp
Delinearization.cpp
DependenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
FunctionTargetTransformInfo.cpp	Add a new pass FunctionTargetTransformInfo. This pass serves as a	2014-09-18 00:34:14 +00:00
InstCount.cpp
InstructionSimplify.cpp	InstCombine, InstSimplify: (%X /s C1) /s C2 isn't always 0 when C1 * C2 overflow	2014-10-11 10:20:01 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp
JumpInstrTableInfo.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp	[LVI] Check for @llvm.assume dominating the edge branch	2014-10-14 16:04:49 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp
LoopPass.cpp	Fix assertion in LICM doFinalization()	2014-09-24 16:48:31 +00:00
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp	PR21145: Teach LLVM about C++14 sized deallocation functions.	2014-10-03 20:17:06 +00:00
MemoryDependenceAnalysis.cpp	Silence a -Wsign-compare warning. NFC.	2014-10-02 13:17:11 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp	Simplify code. No functionality change.	2014-10-05 12:21:57 +00:00
PHITransAddr.cpp
PostDominators.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	[SCEV] Add some asserts to the recently improved trip count computation	2014-10-11 00:12:11 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp
ScopedNoAliasAA.cpp
SparsePropagation.cpp
StratifiedSets.h
TargetTransformInfo.cpp	Ignore annotation function calls in cost computation	2014-09-26 17:48:40 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp

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))

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