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llvm-project/llvm/lib/CodeGen/SelectionDAG
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Craig Topper ba375263e8 [DAGCombiner][X86] Teach visitCONCAT_VECTORS to combine (concat_vectors (concat_vectors X, Y), undef)) -> (concat_vectors X, Y, undef, undef) 
I also had to add a new combine to X86's combineExtractSubvector to prevent a regression.

This helps our vXi1 code see the full concat operation and allow it optimize undef to a zero if there is already a zero in the concat. This helped us use a movzx instead of an AND in some of the tests. In those tests, one concat comes from SelectionDAGBuilder and the second comes from type legalization of v4i1->i4 bitcasts which uses an additional concat. Though these changes weren't my original motivation.

I'm looking at making X86ISelLowering's narrowShuffle emit a concat_vectors instead of an insert_subvector since concat_vectors is more canonical during early DAG combine. This patch helps prevent a regression from my experiments with that.

Differential Revision: https://reviews.llvm.org/D66456

llvm-svn: 369459
 		2019-08-20 22:12:50 +00:00
..
CMakeLists.txt
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DAGCombiner.cpp [DAGCombiner][X86] Teach visitCONCAT_VECTORS to combine (concat_vectors (concat_vectors X, Y), undef)) -> (concat_vectors X, Y, undef, undef) 2019-08-20 22:12:50 +00:00
FastISel.cpp Finish moving TargetRegisterInfo::isVirtualRegister() and friends to llvm::Register as started by r367614. NFC 2019-08-01 23:27:28 +00:00
FunctionLoweringInfo.cpp Finish moving TargetRegisterInfo::isVirtualRegister() and friends to llvm::Register as started by r367614. NFC 2019-08-01 23:27:28 +00:00
InstrEmitter.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
InstrEmitter.h [SelectionDAG] Enhance the simplification of `copyto` from `implicit-def`. 2019-05-27 18:26:29 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
LegalizeDAG.cpp [Strict FP] Allow custom operation actions 2019-08-06 10:43:13 +00:00
LegalizeFloatTypes.cpp AMDGPU: Correct behavior of f16 buffer loads 2019-08-05 15:59:07 +00:00
LegalizeIntegerTypes.cpp [SelectionDAG] Extend base addressing modes supported by MGATHER/MSCATTER 2019-08-06 09:46:13 +00:00
LegalizeTypes.cpp Propagate fmf for setcc in SDAG for select folds 2019-06-03 21:53:26 +00:00
LegalizeTypes.h [SelectionDAG] Widen vector results of SMULFIX/UMULFIX/SMULFIXSAT 2019-08-11 19:27:06 +00:00
LegalizeTypesGeneric.cpp [LegalizeTypes] Remove SplitVSETCC helper and just call SplitVecRes_SETCC. 2019-08-08 21:13:58 +00:00
LegalizeVectorOps.cpp [SelectionDAG] Widen vector results of SMULFIX/UMULFIX/SMULFIXSAT 2019-08-11 19:27:06 +00:00
LegalizeVectorTypes.cpp [SelectionDAG] Widen vector results of SMULFIX/UMULFIX/SMULFIXSAT 2019-08-11 19:27:06 +00:00
ResourcePriorityQueue.cpp Implementation of asm-goto support in LLVM 2019-02-08 20:48:56 +00:00
SDNodeDbgValue.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ScheduleDAGFast.cpp Finish moving TargetRegisterInfo::isVirtualRegister() and friends to llvm::Register as started by r367614. NFC 2019-08-01 23:27:28 +00:00
ScheduleDAGRRList.cpp Finish moving TargetRegisterInfo::isVirtualRegister() and friends to llvm::Register as started by r367614. NFC 2019-08-01 23:27:28 +00:00
ScheduleDAGSDNodes.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
ScheduleDAGSDNodes.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ScheduleDAGVLIW.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
SelectionDAG.cpp [SelectionDAG] Add a node creation debug message to getMachineNode. 2019-08-18 06:28:00 +00:00
SelectionDAGAddressAnalysis.cpp [DAGCombiner] Unify Lifetime and memory Op aliasing. 2019-03-27 14:14:46 +00:00
SelectionDAGBuilder.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
SelectionDAGBuilder.h [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
SelectionDAGDumper.cpp [CodeGen] Add lrint/llrint builtins 2019-05-28 20:47:44 +00:00
SelectionDAGISel.cpp [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
SelectionDAGPrinter.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
SelectionDAGTargetInfo.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
StatepointLowering.cpp [Statepoints] Fix overalignment of loads in no-realign-stack functions 2019-08-02 20:17:37 +00:00
StatepointLowering.h [FastISel] Fix crash for gc.relocate lowring 2019-04-05 05:41:08 +00:00
TargetLowering.cpp [TargetLowering] x s% C == 0 fold: vector divisor with INT_MIN handling 2019-08-19 15:01:42 +00:00