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Jingyue Wu 8cb6b2a292 Simplify n-ary adds by reassociation 
Summary:
This transformation reassociates a n-ary add so that the add can partially reuse
existing instructions. For example, this pass can simplify

  void foo(int a, int b) {
    bar(a + b);
    bar((a + 2) + b);
  }

to

  void foo(int a, int b) {
    int t = a + b;
    bar(t);
    bar(t + 2);
  }

saving one add instruction.

Fixes PR22357 (https://llvm.org/bugs/show_bug.cgi?id=22357).

Test Plan: nary-add.ll

Reviewers: broune, dberlin, hfinkel, meheff, sanjoy, atrick

Reviewed By: sanjoy, atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8950

llvm-svn: 234855
 		2015-04-14 04:59:22 +00:00
..
ADCE.cpp [ADCE] Don't indent inside an anonymous namespace 2015-02-16 18:08:00 +00:00
AlignmentFromAssumptions.cpp Use 'override/final' instead of 'virtual' for overridden methods 2015-04-11 02:11:45 +00:00
BDCE.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
CMakeLists.txt Simplify n-ary adds by reassociation 2015-04-14 04:59:22 +00:00
ConstantHoisting.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
ConstantProp.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
CorrelatedValuePropagation.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
DCE.cpp [PM] Separate the TargetLibraryInfo object from the immutable pass. 2015-01-15 10:41:28 +00:00
DeadStoreElimination.cpp [CallSite] Make construction from Value* (or Instruction*) explicit. 2015-04-10 14:50:08 +00:00
EarlyCSE.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
FlattenCFGPass.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
Float2Int.cpp Reapply r233175 and r233183: float2int. 2015-03-27 10:36:57 +00:00
GVN.cpp [opaque pointer type] API migration for GEP constant factories 2015-04-02 18:55:32 +00:00
IndVarSimplify.cpp [SCEV] Refactor out isHighCostExpansion. NFCI. 2015-04-14 03:20:28 +00:00
InductiveRangeCheckElimination.cpp [IRCE] Fix how IRCE checks for no-sign-overflow. 2015-03-24 19:29:22 +00:00
JumpThreading.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LICM.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LLVMBuild.txt Update libdeps since TLI was moved from Target to Analysis in r226078. 2015-01-15 05:21:00 +00:00
LoadCombine.cpp Mark empty default constructors as =default if it makes the type POD 2015-04-11 18:57:14 +00:00
LoopDeletion.cpp [PM] Split the LoopInfo object apart from the legacy pass, creating 2015-01-17 14:16:18 +00:00
LoopIdiomRecognize.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopInstSimplify.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
LoopInterchange.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopRerollPass.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopRotation.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
LoopStrengthReduce.cpp Mark empty default constructors as =default if it makes the type POD 2015-04-11 18:57:14 +00:00
LoopUnrollPass.cpp [LoopUnrollRuntime] Avoid high-cost trip count computation. 2015-04-14 03:20:38 +00:00
LoopUnswitch.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
LowerAtomic.cpp IR: add "cmpxchg weak" variant to support permitted failure. 2014-06-13 14:24:07 +00:00
LowerExpectIntrinsic.cpp [PM] Port LowerExpectIntrinsic to the new pass manager. 2015-01-24 11:13:02 +00:00
Makefile
…
MemCpyOptimizer.cpp [CallSite] Make construction from Value* (or Instruction*) explicit. 2015-04-10 14:50:08 +00:00
MergedLoadStoreMotion.cpp Another set of missing raw_ostream.h. Still no functional change. 2015-03-23 18:45:56 +00:00
NaryReassociate.cpp Simplify n-ary adds by reassociation 2015-04-14 04:59:22 +00:00
PartiallyInlineLibCalls.cpp [multiversion] Thread a function argument through all the callers of the 2015-02-01 12:01:35 +00:00
PlaceSafepoints.cpp [CallSite] Make construction from Value* (or Instruction*) explicit. 2015-04-10 14:50:08 +00:00
Reassociate.cpp Reapply "[Reassociate] Add initial support for vector instructions." 2015-03-13 20:53:01 +00:00
Reg2Mem.cpp Standardize {pred,succ,use,user}_empty() 2015-01-13 03:46:47 +00:00
RewriteStatepointsForGC.cpp [RewriteStatepointsForGC] Delete dead code [NFC] 2015-04-14 00:41:34 +00:00
SCCP.cpp [opaque pointer type] API migration for GEP constant factories 2015-04-02 18:55:32 +00:00
SROA.cpp DebugInfo: Gut DIExpression 2015-04-14 01:12:42 +00:00
SampleProfile.cpp DebugInfo: Gut DISubprogram and DILexicalBlock* 2015-04-14 03:40:37 +00:00
Scalar.cpp Simplify n-ary adds by reassociation 2015-04-14 04:59:22 +00:00
ScalarReplAggregates.cpp [opaque pointer type] More GEP API migrations in IRBuilder uses 2015-04-03 19:41:44 +00:00
Scalarizer.cpp [opaque pointer type] More GEP IRBuilder API migrations 2015-04-03 23:03:54 +00:00
SeparateConstOffsetFromGEP.cpp [opaque pointer type] More GEP API migrations in IRBuilder uses 2015-04-03 19:41:44 +00:00
SimplifyCFGPass.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
Sink.cpp DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
StraightLineStrengthReduce.cpp [SLSR] consider &B[S << i] as &B[(1 << i) * S] 2015-04-06 17:15:48 +00:00
StructurizeCFG.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00
TailRecursionElimination.cpp Re-sort includes with sort-includes.py and insert raw_ostream.h where it's used. 2015-03-23 19:32:43 +00:00