llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-09 10:05:41 +00:00

History

Reid Kleckner 59bec0e3c0 Update optimization passes to handle inalloca arguments Summary: I searched Transforms/ and Analysis/ for 'ByVal' and updated those call sites to check for inalloca if appropriate. I added tests for any change that would allow an optimization to fire on inalloca. Reviewers: nlewycky Differential Revision: http://llvm-reviews.chandlerc.com/D2449 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200281 91177308-0d34-0410-b5e6-96231b3b80d8		2014-01-28 02:38:36 +00:00
..
IPA	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
AliasAnalysis.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
AliasAnalysisCounter.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
AliasAnalysisEvaluator.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
AliasDebugger.cpp
AliasSetTracker.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
Analysis.cpp	[PM] Make the verifier work independently of any pass manager.	2014-01-19 02:22:18 +00:00
BasicAliasAnalysis.cpp	Fix known typos	2014-01-24 17:20:08 +00:00
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp	Make nocapture analysis work with addrspacecast	2014-01-14 19:11:52 +00:00
CFG.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
CFGPrinter.cpp
CMakeLists.txt
CodeMetrics.cpp
ConstantFolding.cpp
CostModel.cpp	Get right cost for addrspacecast in cost model	2014-01-22 20:30:16 +00:00
Delinearization.cpp
DependenceAnalysis.cpp	Fix known typos	2014-01-24 17:20:08 +00:00
DominanceFrontier.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
DomPrinter.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
InstCount.cpp
InstructionSimplify.cpp	InstSimplify: Make shift, select and GEP simplifications vector-aware.	2014-01-24 17:09:53 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopPass.cpp	[PM] Rename the IR printing pass header to a more generic and correct	2014-01-12 11:10:32 +00:00
Makefile
MemDepPrinter.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
MemoryBuiltins.cpp	Update optimization passes to handle inalloca arguments	2014-01-28 02:38:36 +00:00
MemoryDependenceAnalysis.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
ModuleDebugInfoPrinter.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
NoAliasAnalysis.cpp
PHITransAddr.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
PostDominators.cpp	[PM] Pull the generic graph algorithms and data structures for dominator	2014-01-13 10:52:56 +00:00
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	Fix crasher introduced in r200203 and caught by a libc++ buildbot. Don't assume that getMulExpr returns a SCEVMulExpr, it may have simplified it to something else!	2014-01-27 10:47:44 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
ScalarEvolutionNormalization.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
SparsePropagation.cpp
TargetTransformInfo.cpp	Revert "Revert "Add Constant Hoisting Pass" (r200034)"	2014-01-25 02:02:55 +00:00
Trace.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Update optimization passes to handle inalloca arguments	2014-01-28 02:38:36 +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))

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