llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-13 07:29:38 +00:00

History

Andrew Trick ecb35ece5c SCEV fix. In general, Add/Mul expressions should not inherit NSW/NUW. This reverts r139450, fixes r139453, and adds much needed comments and a unit test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145367 91177308-0d34-0410-b5e6-96231b3b80d8		2011-11-29 02:16:38 +00:00
..
IPA	build: Add initial cut at LLVMBuild.txt files.	2011-11-03 18:53:17 +00:00
AliasAnalysis.cpp	Enhance alias analysis for atomic instructions a bit. Upgrade a couple alias-analysis tests to the new atomic instructions.	2011-09-26 20:15:28 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp	Atomic load/store support in LICM.	2011-08-15 20:52:09 +00:00
Analysis.cpp	C API functions must be able to see their extern "C" definitions, or it will be impossible to call them from C.	2011-08-19 01:36:54 +00:00
BasicAliasAnalysis.cpp	Refactor code to use new attribute getters on CallSite for NoCapture and ByVal.	2011-11-20 19:09:04 +00:00
BlockFrequencyInfo.cpp	Add pass printing support to BlockFrequencyInfo pass. The implementation	2011-10-19 10:12:41 +00:00
BranchProbabilityInfo.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
CaptureTracking.cpp	Fix crasher in GVN due to my recent capture tracking changes.	2011-11-21 19:42:56 +00:00
CFGPrinter.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
CMakeLists.txt
ConstantFolding.cpp	Fixes following the CR by Chris and Duncan:	2011-08-29 19:58:36 +00:00
DbgInfoPrinter.cpp	Fix for DbgInfoPrinter.cpp:174:12: warning: ‘LineNo’ may be used uninitialized in this function.	2011-09-21 23:34:23 +00:00
DebugInfo.cpp	Update DebugInfoFinder to match recent debug info encoding changes.	2011-10-17 22:30:34 +00:00
DIBuilder.cpp	Fix typo in comment.	2011-11-09 22:45:04 +00:00
DominanceFrontier.cpp
DomPrinter.cpp
InlineCost.cpp	A FIXME about block addresses and indirectbr.	2011-10-20 04:05:33 +00:00
InstCount.cpp
InstructionSimplify.cpp	Fix code to match comment. Fixes PR11340, a regression from r143209.	2011-11-08 21:08:02 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Slightly more useful tracing.	2011-10-13 17:06:38 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LLVMBuild.txt	build: Add initial cut at LLVMBuild.txt files.	2011-11-03 18:53:17 +00:00
Loads.cpp	Add some comments here because the lack of a check for volatile/atomic here is a bit unusual.	2011-08-15 21:56:39 +00:00
LoopDependenceAnalysis.cpp	Misc analysis passes that need to be aware of atomic load/store.	2011-08-15 20:54:19 +00:00
LoopInfo.cpp	Remove the temporary flag -disable-unroll-scev and dead code.	2011-11-28 19:22:09 +00:00
LoopPass.cpp	Reapply r138695. Fix PassManager stack depths.	2011-08-29 17:07:00 +00:00
Makefile
MemDepPrinter.cpp	Enhance the memdep interface so that users can tell the difference between a dependency which cannot be calculated and a path reaching the entry point of the function. This patch introduces isNonFuncLocal, which replaces isUnknown in some cases.	2011-10-13 22:14:57 +00:00
MemoryBuiltins.cpp	Validate the return type when checking if a function is malloc.	2011-11-23 17:58:47 +00:00
MemoryDependenceAnalysis.cpp	Fix crasher in GVN due to my recent capture tracking changes.	2011-11-21 19:42:56 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PathNumbering.cpp
PathProfileInfo.cpp
PathProfileVerifier.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
PHITransAddr.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
ProfileVerifierPass.cpp	Move code into anonymous namespaces.	2011-11-26 23:01:57 +00:00
README.txt
RegionInfo.cpp	Missed some users of Value::getNameStr.	2011-11-15 18:30:06 +00:00
RegionPass.cpp	Reapply r138695. Fix PassManager stack depths.	2011-08-29 17:07:00 +00:00
RegionPrinter.cpp
ScalarEvolution.cpp	SCEV fix. In general, Add/Mul expressions should not inherit NSW/NUW.	2011-11-29 02:16:38 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Fix SCEVExpander assert during LSR: "argument of incompatible type".	2011-10-15 06:19:55 +00:00
ScalarEvolutionNormalization.cpp	Fix memory corruption I introduced a few checkins ago.	2011-10-13 18:49:23 +00:00
SparsePropagation.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
Trace.cpp	Remove all remaining uses of Value::getNameStr().	2011-11-15 16:27:03 +00:00
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Make SelectionDAG::InferPtrAlignment use llvm::ComputeMaskedBits instead of duplicating the logic for globals. Make llvm::ComputeMaskedBits handle GlobalVariables slightly more aggressively, to match what InferPtrAlignment knew how to do.	2011-11-28 22:48:22 +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))

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