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llvm-project/llvm/utils/TableGen
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Alex Richardson b84be9f2f1 Add all constant physical registers to callee preserved masks 
This allows MachineCopyPropagation to eliminate copies of constant registers
such as zero registers. They were previously not being eliminated as the
check for MO.clobbersPhysReg(AvailSrc) would return true for constant
registers such as MIPS $zero.

To avoid having to manually add the zero registers to all CalleeSavedRegs
instantiations in tablegen, I instead added a new isConstant bit to the
Register and set this for MIPS, RISC-V, and AArch64 zero registers.
RegisterInfoEmitter.cpp looks at this flag and adds all constant registers
to the preserved register mask.

This may also benefit other passes but so far I have only seen differences
in MachineCopyPropagation. In the future it might make sense to generate
`isConstantPhysReg()` from this information.

Original source: 8588d8b814

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D131958
 		2022-09-21 12:50:12 +00:00
..
GlobalISel [GISel] TreeMatcher: always skip leaves if they don't care 2022-09-20 20:55:02 +00:00
AsmMatcherEmitter.cpp [llvm] Use llvm::find_if (NFC) 2022-08-28 10:41:48 -07:00
AsmWriterEmitter.cpp [llvm] Use std::size instead of llvm::array_lengthof 2022-09-08 09:01:53 -06:00
AsmWriterInst.cpp
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AsmWriterInst.h
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Attributes.cpp [llvm] Qualify auto in range-based for loops (NFC) 2022-09-03 11:17:49 -07:00
CMakeLists.txt [cmake] Fix tablegen exports 2022-08-16 14:17:23 +02:00
CTagsEmitter.cpp
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CallingConvEmitter.cpp
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CodeEmitterGen.cpp [TableGen] Optimize APInt |= with setBit. NFC 2022-09-18 23:25:58 -07:00
CodeGenDAGPatterns.cpp
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CodeGenDAGPatterns.h Revert "Use std::is_same_v instead of std::is_same (NFC)" 2022-08-20 23:00:39 -07:00
CodeGenHwModes.cpp
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CodeGenHwModes.h
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CodeGenInstruction.cpp [AMDGPU][GISel] Enable Selection of ADD3 for G_PTR_ADD 2022-08-24 14:44:19 +00:00
CodeGenInstruction.h [AMDGPU][GISel] Enable Selection of ADD3 for G_PTR_ADD 2022-08-24 14:44:19 +00:00
CodeGenIntrinsics.h [Intrinsics] Add initial support for NonNull attribute 2022-08-16 21:28:23 +00:00
CodeGenMapTable.cpp
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CodeGenRegisters.cpp RegAllocGreedy: Avoid overflowing priority bitfields 2022-09-15 10:38:40 -04:00
CodeGenRegisters.h RegAllocGreedy: Avoid overflowing priority bitfields 2022-09-15 10:38:40 -04:00
CodeGenSchedule.cpp [llvm-tblgen] CodeGenSchedModels::hasReadOfWrite gets wrong predication result 2022-09-19 14:22:43 +08:00
CodeGenSchedule.h
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CodeGenTarget.cpp [ValueTypes] Define MVTs for v256i2/v128i4. 2022-09-13 09:02:23 -07:00
CodeGenTarget.h
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CompressInstEmitter.cpp [RISCV][TableGen] Mark MachineInstr with FrameIndex as not compressible 2022-08-24 13:23:38 +08:00
DAGISelEmitter.cpp
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DAGISelMatcher.cpp
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DAGISelMatcher.h
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DAGISelMatcherEmitter.cpp
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DAGISelMatcherGen.cpp
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DAGISelMatcherOpt.cpp
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DFAEmitter.cpp [tblgen] Use std::variant to simplify code. NFCI. 2022-08-27 10:50:28 +02:00
DFAEmitter.h
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DFAPacketizerEmitter.cpp
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DXILEmitter.cpp Fix MSVC "not all control paths return a value" warning. NFC 2022-07-26 10:44:00 +01:00
DecoderEmitter.cpp [llvm] Fix comment typos (NFC) 2022-08-07 00:16:14 -07:00
DirectiveEmitter.cpp
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DisassemblerEmitter.cpp
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ExegesisEmitter.cpp
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FastISelEmitter.cpp [FastISel] Propagate PCSections metadata to MachineInstr 2022-09-07 11:36:01 +02:00
GICombinerEmitter.cpp [GIsel] Add missing space between type and name in GICombinerHelperArg 2022-08-02 13:35:25 -04:00
GlobalISelEmitter.cpp [llvm] Qualify auto in range-based for loops (NFC) 2022-09-03 11:17:49 -07:00
InfoByHwMode.cpp
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InfoByHwMode.h
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InstrDocsEmitter.cpp
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InstrInfoEmitter.cpp
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IntrinsicEmitter.cpp [Intrinsics] Add initial support for NonNull attribute 2022-08-16 21:28:23 +00:00
OptEmitter.cpp
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OptEmitter.h
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OptParserEmitter.cpp
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OptRSTEmitter.cpp
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PredicateExpander.cpp
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PredicateExpander.h
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PseudoLoweringEmitter.cpp
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RegisterBankEmitter.cpp
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RegisterInfoEmitter.cpp Add all constant physical registers to callee preserved masks 2022-09-21 12:50:12 +00:00
SDNodeProperties.cpp
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SDNodeProperties.h
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SearchableTableEmitter.cpp [llvm] Qualify auto in range-based for loops (NFC) 2022-09-03 11:17:49 -07:00
SequenceToOffsetTable.h
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SubtargetEmitter.cpp
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SubtargetFeatureInfo.cpp
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SubtargetFeatureInfo.h
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TableGen.cpp
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TableGenBackends.h
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Types.cpp
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Types.h
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VarLenCodeEmitterGen.cpp
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VarLenCodeEmitterGen.h
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WebAssemblyDisassemblerEmitter.cpp
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WebAssemblyDisassemblerEmitter.h
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X86DisassemblerShared.h
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X86DisassemblerTables.cpp [llvm] Remove includes of `llvm/Support/STLArrayExtras.h` 2022-09-09 17:44:00 -06:00
X86DisassemblerTables.h
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X86EVEX2VEXTablesEmitter.cpp
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X86FoldTablesEmitter.cpp
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X86MnemonicTables.cpp
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X86ModRMFilters.cpp
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X86ModRMFilters.h
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X86RecognizableInstr.cpp
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X86RecognizableInstr.h
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tdtags
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