llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-04 22:07:27 +00:00

History

Jan Wen Voung 87a61e97b7 Move TargetLibraryInfo data from two files into one common .def file. Summary: This makes it more obvious that the enum definition and the "StandardName" array is in sync. Mechanically refactored w/ a python script. Test Plan: still compiles Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D7845 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231172 91177308-0d34-0410-b5e6-96231b3b80d8		2015-03-03 23:41:58 +00:00
..
IPA	Remove getDataLayout() from Instruction/GlobalValue/BasicBlock/Function	2015-03-03 22:01:13 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp	Remove the Forward Control Flow Integrity pass and its dependencies.	2015-02-27 19:03:38 +00:00
AssumptionCache.cpp	[PM] Actually add the new pass manager support for the assumption cache.	2015-01-22 21:53:09 +00:00
BasicAliasAnalysis.cpp	[BasicAA] Try to disambiguate GEPs through arrays of structs into	2015-02-07 17:04:29 +00:00
BlockFrequencyInfo.cpp
BlockFrequencyInfoImpl.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFG.cpp
CFGPrinter.cpp
CFLAliasAnalysis.cpp	Revert "Remove the explicit SDNodeIterator::operator= in favor of the implicit default"	2015-03-03 21:18:16 +00:00
CGSCCPassManager.cpp
CMakeLists.txt	Remove the Forward Control Flow Integrity pass and its dependencies.	2015-02-27 19:03:38 +00:00
CodeMetrics.cpp
ConstantFolding.cpp
CostModel.cpp	[multiversion] Thread a function argument through all the callers of the	2015-02-01 12:01:35 +00:00
Delinearization.cpp
DependenceAnalysis.cpp	unique_ptrify FullDependenceAnalysis::DV	2015-03-03 19:20:18 +00:00
DominanceFrontier.cpp
DomPrinter.cpp
InstCount.cpp
InstructionSimplify.cpp	InstSimplify: simplify 0 / X if nnan and nsz	2015-02-23 18:30:25 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp	Reduce double set lookups.	2015-02-27 21:43:14 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp	Unify the two EH personality classification routines I wrote	2015-02-14 00:21:02 +00:00
Lint.cpp	[PM] Remove the old 'PassManager.h' header file at the top level of	2015-02-13 10:01:29 +00:00
LLVMBuild.txt
Loads.cpp	Remove getDataLayout() from Instruction/GlobalValue/BasicBlock/Function	2015-03-03 22:01:13 +00:00
LoopAccessAnalysis.cpp	[LV/LoopAccesses] Backward dependences are not safe just because the	2015-02-26 17:58:48 +00:00
LoopInfo.cpp
LoopPass.cpp
Makefile
MemDepPrinter.cpp	MemDepPrinter: Fix some nits introduced in r228596	2015-02-25 23:55:00 +00:00
MemDerefPrinter.cpp	MemDerefPrinter: Require DataLayoutPass for higher accuracy	2015-02-09 21:50:03 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	Revert 229175	2015-02-15 19:07:31 +00:00
ModuleDebugInfoPrinter.cpp	DebugInfo: Move new hierarchy into place	2015-03-03 17:24:31 +00:00
NoAliasAnalysis.cpp
PHITransAddr.cpp
PostDominators.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	Fix bug 22641	2015-02-24 01:02:42 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	SCEVExpander incorrectly marks generated subtractions as nuw/nsw	2015-02-26 19:51:35 +00:00
ScalarEvolutionNormalization.cpp
ScopedNoAliasAA.cpp
SparsePropagation.cpp
StratifiedSets.h
TargetLibraryInfo.cpp	Move TargetLibraryInfo data from two files into one common .def file.	2015-03-03 23:41:58 +00:00
TargetTransformInfo.cpp	Prevent hoisting fmul from THEN/ELSE to IF if there is fmsub/fmadd opportunity.	2015-02-23 19:15:16 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp	Correctly combine alias.scope metadata by a union instead of intersecting	2015-02-08 17:07:14 +00:00
ValueTracking.cpp	Teach ComputeNumSignBits about signed divisions.	2015-03-03 21:39:02 +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))

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