llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-01 10:57:21 +00:00

History

Chris Lattner 17f0cd3cc1 teach libanalysis to simplify vector loads with bitcast sources. This implements something out of Target/README.txt producing: _foo: ## @foo movl 4(%esp), %eax movapd LCPI1_0, %xmm0 movapd %xmm0, (%eax) ret $4 instead of: _foo: ## @foo movl 4(%esp), %eax movapd _b, %xmm0 mulpd LCPI1_0, %xmm0 addpd _a, %xmm0 movapd %xmm0, (%eax) ret $4 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84942 91177308-0d34-0410-b5e6-96231b3b80d8		2009-10-23 06:57:37 +00:00
..
IPA	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp	inline isGEP away.	2009-10-17 23:48:54 +00:00
CaptureTracking.cpp
CFGPrinter.cpp	make DOTGraphTraits public, patch by Tobias Grosser!	2009-10-18 04:09:11 +00:00
CMakeLists.txt	add function passes for printing various dominator datastructures	2009-10-18 04:10:40 +00:00
ConstantFolding.cpp	teach libanalysis to simplify vector loads with bitcast sources. This	2009-10-23 06:57:37 +00:00
DbgInfoPrinter.cpp	Remove std::string uses from DebugInfo interface.	2009-09-29 18:40:58 +00:00
DebugInfo.cpp	"there is not any instruction with attached debug info in this module" does not mean "there is no debug info in this module". :)	2009-10-13 17:35:35 +00:00
DomPrinter.cpp	fix the other issue with ID's, hopefully really fixing the linux build.	2009-10-18 04:58:34 +00:00
InlineCost.cpp	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +00:00
InstCount.cpp	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp	Fix another place that calls Loop::contains a lot to construct a sorted	2009-10-20 20:41:13 +00:00
LoopPass.cpp	Fix this debug output to handle the case where the loop has been deleted.	2009-09-28 15:40:01 +00:00
Makefile
MallocHelper.cpp	Invert isSafeToGetMallocArraySize check because we return NULL when we don't know the size.	2009-10-16 18:08:17 +00:00
MemoryDependenceAnalysis.cpp	Memory dependence analysis was incorrectly stopping to scan for stores to a pointer at bitcast uses of a malloc call.	2009-10-13 01:42:53 +00:00
PointerTracking.cpp	Fix bug where array malloc with unexpected computation of the size argument resulted in MallocHelper	2009-10-15 20:14:52 +00:00
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt	Create a README.txt for lib/Analysis, and add an entry.	2009-09-28 18:38:53 +00:00
ScalarEvolution.cpp	Revert r83606 and add comments explaining why it isn't safe.	2009-10-09 16:35:06 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Introduce and use convenience methods for getting pointer types	2009-10-06 15:40:36 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +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.

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