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llvm-project/llvm/lib/CodeGen/SelectionDAG
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Nirav Dave fa250cad37 Prevent construction of cycle in DAG store merge 
When merging stores in DAGCombiner, add check to ensure that no
dependenices exist that would cause the construction of a cycle in our
DAG.  This may happen if one store has a data dependence on another
instruction (e.g. a load) which itself has a (chain) dependence on
another store being merged. These stores cannot be merged safely and
doing so results in a cycle that is discovered in LegalizeDAG.

This test is only done in cases where Antialias analysis is used (UseAA)
as non-AA store merge candidates will be merged logically after all
loads which have been checked to not alias.

Reviewers: ahatanak, spatel, niravd, arsenm, hfinkel, tstellarAMD, jyknight

Subscribers: llvm-commits, tberghammer, danalbert, srhines

Differential Revision: http://reviews.llvm.org/D18336

llvm-svn: 264461
 		2016-03-25 21:06:30 +00:00
..
CMakeLists.txt Rename TargetSelectionDAGInfo into SelectionDAGTargetInfo and move it to CodeGen/ 2016-01-27 16:32:26 +00:00
DAGCombiner.cpp Prevent construction of cycle in DAG store merge 2016-03-25 21:06:30 +00:00
FastISel.cpp Add "first class" lowering for deopt operand bundles 2016-03-22 00:59:13 +00:00
FunctionLoweringInfo.cpp [Statepoints] Fix yet another issue around gc pointer uniqueing 2016-03-24 18:57:39 +00:00
InstrEmitter.cpp [X86] Part 1 to fix x86-64 fp128 calling convention. 2015-12-03 22:02:40 +00:00
InstrEmitter.h [SDAG] Give InstrEmitter hidden visibility 2015-07-01 14:55:10 +00:00
LLVMBuild.txt
…
LegalizeDAG.cpp Prevent construction of cycle in DAG store merge 2016-03-25 21:06:30 +00:00
LegalizeFloatTypes.cpp Do not try to use i8 and i16 versions of FP_TO_U/SINT soft float library calls 2015-12-15 12:55:50 +00:00
LegalizeIntegerTypes.cpp Remove unsafe AssertZext after promoting result of FP_TO_FP16 2016-03-24 14:06:03 +00:00
LegalizeTypes.cpp Revert "[mips] Promote the result of SETCC nodes to GPR width." 2016-03-01 20:25:43 +00:00
LegalizeTypes.h [X86][SSE] Reapplied: Simplify vector LOAD + EXTEND on pre-SSE41 hardware 2016-03-22 16:22:08 +00:00
LegalizeTypesGeneric.cpp [X86] Part 1 to fix x86-64 fp128 calling convention. 2015-12-03 22:02:40 +00:00
LegalizeVectorOps.cpp [X86][SSE] Reapplied: Improve vector ZERO_EXTEND by combining to ZERO_EXTEND_VECTOR_INREG 2016-03-10 20:40:26 +00:00
LegalizeVectorTypes.cpp [X86][SSE] Reapplied: Simplify vector LOAD + EXTEND on pre-SSE41 hardware 2016-03-22 16:22:08 +00:00
ResourcePriorityQueue.cpp Fix some comment typos. 2015-08-08 18:27:36 +00:00
SDNodeDbgValue.h Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
ScheduleDAGFast.cpp Replace uint16_t with the MCPhysReg typedef in many places. A lot of physical register arrays already use this typedef. 2015-12-05 07:13:35 +00:00
ScheduleDAGRRList.cpp rangify; NFCI 2016-02-03 22:44:14 +00:00
ScheduleDAGSDNodes.cpp Avoid overly large SmallPtrSet/SmallSet 2016-01-30 01:24:31 +00:00
ScheduleDAGSDNodes.h [SelectionDAG] Remove dead code. NFC. 2015-10-15 17:54:06 +00:00
ScheduleDAGVLIW.cpp Use 'override/final' instead of 'virtual' for overridden methods 2015-04-11 02:11:45 +00:00
SelectionDAG.cpp Prevent construction of cycle in DAG store merge 2016-03-25 21:06:30 +00:00
SelectionDAGBuilder.cpp Add lowering support for llvm.experimental.deoptimize 2016-03-24 20:23:29 +00:00
SelectionDAGBuilder.h Reduce code duplication by extracting out a helper function; NFC 2016-03-24 22:51:49 +00:00
SelectionDAGDumper.cpp Avoid overly large SmallPtrSet/SmallSet 2016-01-30 01:24:31 +00:00
SelectionDAGISel.cpp CXX TLS: collect return blocks after SelectAllBasicBlocks. 2016-03-24 23:21:29 +00:00
SelectionDAGPrinter.cpp Make the SelectionDAG graph printer use SDNode::PersistentId labels. 2015-10-27 23:09:03 +00:00
SelectionDAGTargetInfo.cpp Rename TargetSelectionDAGInfo into SelectionDAGTargetInfo and move it to CodeGen/ 2016-01-27 16:32:26 +00:00
StatepointLowering.cpp Reduce code duplication by extracting out a helper function; NFC 2016-03-24 22:51:49 +00:00
StatepointLowering.h [StatepointLowering] Don't do two DenseMap lookups; nfci 2016-03-23 02:24:15 +00:00
TargetLowering.cpp [DAG] use !isUndef() ; NFCI 2016-03-14 18:09:43 +00:00