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llvm-project/llvm/lib/CodeGen/SelectionDAG
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Sanjay Patel 4fd2e2a498 [DAGCombiner][x86] add transform/hook to decompose integer multiply into shift/add 
This is an alternative to D37896. I don't see a way to decompose multiplies 
generically without a target hook to tell us when it's profitable. 

ARM and AArch64 may be able to remove some duplicate code that overlaps with 
this transform.

As a first step, we're only getting the most clear wins on the vector examples
requested in PR34474:
https://bugs.llvm.org/show_bug.cgi?id=34474

As noted in the code comment, it's likely that the x86 constraints are tighter
than necessary, but it may not always be a win to replace a pmullw/pmulld.

Differential Revision: https://reviews.llvm.org/D52195

llvm-svn: 342554
 		2018-09-19 15:57:40 +00:00
..
CMakeLists.txt Remove trailing whitespace to trigger re-cmaking 2017-10-02 21:54:38 +00:00
DAGCombiner.cpp [DAGCombiner][x86] add transform/hook to decompose integer multiply into shift/add 2018-09-19 15:57:40 +00:00
FastISel.cpp [IR] Replace `isa<TerminatorInst>` with `isTerminator()`. 2018-08-26 09:51:22 +00:00
FunctionLoweringInfo.cpp DAG: Add calling convention argument to calling convention funcs 2018-07-28 13:25:19 +00:00
InstrEmitter.cpp [MI] Change the array of `MachineMemOperand` pointers to be 2018-08-16 21:30:05 +00:00
InstrEmitter.h [DebugInfo] Convert intrinsic llvm.dbg.label to MachineInstr. 2018-05-09 02:41:08 +00:00
LLVMBuild.txt
…
LegalizeDAG.cpp [DAGCombiner] try to convert pow(x, 1/3) to cbrt(x) 2018-09-16 16:50:26 +00:00
LegalizeFloatTypes.cpp DAG: Try to custom lower when promoting float operands 2018-08-15 20:34:54 +00:00
LegalizeIntegerTypes.cpp [SelectionDAG] Remove some code from PromoteIntOp_MGATHER that handles UpdateNodeOperands returning an existing node instead of updating. 2018-09-12 05:25:41 +00:00
LegalizeTypes.cpp [DAG] Don't map a TableId to itself in the ReplacedValues map 2018-06-20 16:06:09 +00:00
LegalizeTypes.h [X86] Support v2i32 gather/scatter indices with -x86-experimental-vector-widening-legalization 2018-08-29 02:12:49 +00:00
LegalizeTypesGeneric.cpp Avoid losing Hi part when expanding VAARG nodes on big endian machines 2018-07-16 12:14:17 +00:00
LegalizeVectorOps.cpp [FPEnv] Support constrained FREM intrinsic 2018-08-20 19:28:56 +00:00
LegalizeVectorTypes.cpp [X86] Support v2i32 gather/scatter indices with -x86-experimental-vector-widening-legalization 2018-08-29 02:12:49 +00:00
ResourcePriorityQueue.cpp Silence a bunch of implicit fallthrough warnings 2017-12-19 22:05:25 +00:00
SDNodeDbgValue.h SelectionDAG: Add compact SDDbgValue representation to -dag-dump-verbose output 2018-09-14 17:08:02 +00:00
ScheduleDAGFast.cpp ScheduleDAG: Cleanup dumping code; NFC 2018-09-19 00:23:35 +00:00
ScheduleDAGRRList.cpp ScheduleDAG: Cleanup dumping code; NFC 2018-09-19 00:23:35 +00:00
ScheduleDAGSDNodes.cpp ScheduleDAG: Cleanup dumping code; NFC 2018-09-19 00:23:35 +00:00
ScheduleDAGSDNodes.h ScheduleDAG: Cleanup dumping code; NFC 2018-09-19 00:23:35 +00:00
ScheduleDAGVLIW.cpp ScheduleDAG: Cleanup dumping code; NFC 2018-09-19 00:23:35 +00:00
SelectionDAG.cpp Fix debug info for SelectionDAG legalization of DAG nodes with two results. 2018-09-14 19:38:45 +00:00
SelectionDAGAddressAnalysis.cpp [DAG] Teach findBaseOffset to interpret indexes of indexed memory operations 2018-01-26 16:51:27 +00:00
SelectionDAGBuilder.cpp DAG: Handle odd vector sizes in calling conv splitting 2018-09-10 11:49:23 +00:00
SelectionDAGBuilder.h DAG: Add calling convention argument to calling convention funcs 2018-07-28 13:25:19 +00:00
SelectionDAGDumper.cpp [DAGCombiner] try to convert pow(x, 1/3) to cbrt(x) 2018-09-16 16:50:26 +00:00
SelectionDAGISel.cpp [NFC] Rename the DivergenceAnalysis to LegacyDivergenceAnalysis 2018-08-30 14:21:36 +00:00
SelectionDAGPrinter.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
SelectionDAGTargetInfo.cpp [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-09-13 21:15:20 +00:00
StatepointLowering.cpp Remove trailing space 2018-07-30 19:41:25 +00:00
StatepointLowering.h [IR][CodeGen] Remove dependency on EVT from IR/Function.cpp. Move EVT to CodeGen layer. 2018-03-29 17:21:10 +00:00
TargetLowering.cpp DAG: Fix expansion of unaligned FP loads and stores 2018-09-13 12:14:23 +00:00