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Jun 5, 2025
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[LLVM][MC] Introduce OrFail variants of MCD ops #138614

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e99f469
[LLVM][MC] Introduce `OrFail` variants of MCD ops
jurahul Apr 30, 2025
6c78fa6
Fix typo
jurahul May 28, 2025
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33 changes: 19 additions & 14 deletions llvm/include/llvm/MC/MCDecoderOps.h
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Expand Up @@ -10,24 +10,29 @@
#ifndef LLVM_MC_MCDECODEROPS_H
#define LLVM_MC_MCDECODEROPS_H

namespace llvm {
namespace llvm::MCD {

namespace MCD {
// Disassembler state machine opcodes.
// nts_t is either uint16_t or uint24_t based on whether large decoder table is
// enabled.
enum DecoderOps {
OPC_ExtractField = 1, // OPC_ExtractField(uleb128 Start, uint8_t Len)
OPC_FilterValue, // OPC_FilterValue(uleb128 Val, uint16_t NumToSkip)
OPC_CheckField, // OPC_CheckField(uleb128 Start, uint8_t Len,
// uleb128 Val, uint16_t NumToSkip)
OPC_CheckPredicate, // OPC_CheckPredicate(uleb128 PIdx, uint16_t NumToSkip)
OPC_Decode, // OPC_Decode(uleb128 Opcode, uleb128 DIdx)
OPC_TryDecode, // OPC_TryDecode(uleb128 Opcode, uleb128 DIdx,
// uint16_t NumToSkip)
OPC_SoftFail, // OPC_SoftFail(uleb128 PMask, uleb128 NMask)
OPC_Fail // OPC_Fail()
OPC_ExtractField = 1, // OPC_ExtractField(uleb128 Start, uint8_t Len)
OPC_FilterValue, // OPC_FilterValue(uleb128 Val, nts_t NumToSkip)
OPC_FilterValueOrFail, // OPC_FilterValueOrFail(uleb128 Val)
OPC_CheckField, // OPC_CheckField(uleb128 Start, uint8_t Len,
// uleb128 Val, nts_t NumToSkip)
OPC_CheckFieldOrFail, // OPC_CheckFieldOrFail(uleb128 Start, uint8_t Len,
// uleb128 Val)
OPC_CheckPredicate, // OPC_CheckPredicate(uleb128 PIdx, nts_t NumToSkip)
OPC_CheckPredicateOrFail, // OPC_CheckPredicateOrFail(uleb128 PIdx)
OPC_Decode, // OPC_Decode(uleb128 Opcode, uleb128 DIdx)
OPC_TryDecode, // OPC_TryDecode(uleb128 Opcode, uleb128 DIdx,
// nts_t NumToSkip)
OPC_TryDecodeOrFail, // OPC_TryDecodeOrFail(uleb128 Opcode, uleb128 DIdx)
OPC_SoftFail, // OPC_SoftFail(uleb128 PMask, uleb128 NMask)
OPC_Fail // OPC_Fail()
};

} // namespace MCD
} // namespace llvm
} // namespace llvm::MCD

#endif
3 changes: 1 addition & 2 deletions llvm/lib/Target/AArch64/CMakeLists.txt
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Expand Up @@ -7,8 +7,7 @@ tablegen(LLVM AArch64GenAsmWriter.inc -gen-asm-writer)
tablegen(LLVM AArch64GenAsmWriter1.inc -gen-asm-writer -asmwriternum=1)
tablegen(LLVM AArch64GenCallingConv.inc -gen-callingconv)
tablegen(LLVM AArch64GenDAGISel.inc -gen-dag-isel)
tablegen(LLVM AArch64GenDisassemblerTables.inc -gen-disassembler
--large-decoder-table)
tablegen(LLVM AArch64GenDisassemblerTables.inc -gen-disassembler)
tablegen(LLVM AArch64GenFastISel.inc -gen-fast-isel)
tablegen(LLVM AArch64GenGlobalISel.inc -gen-global-isel)
tablegen(LLVM AArch64GenO0PreLegalizeGICombiner.inc -gen-global-isel-combiner
Expand Down
21 changes: 11 additions & 10 deletions llvm/test/TableGen/VarLenDecoder.td
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Expand Up @@ -47,19 +47,19 @@ def FOO32 : MyVarInst<MemOp32> {
);
}

// CHECK-SMALL: MCD::OPC_ExtractField, 3, 5, // Inst{7-3} ...
// CHECK-SMALL-NEXT: MCD::OPC_FilterValue, 8, 4, 0, // Skip to: 11
// CHECK-SMALL-NEXT: MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0, // Opcode: FOO16
// CHECK-SMALL-NEXT: MCD::OPC_FilterValue, 9, 4, 0, // Skip to: 19
// CHECK-SMALL-NEXT: MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: FOO32
// CHECK-SMALL-NEXT: MCD::OPC_Fail,
// CHECK-SMALL: /* 0 */ MCD::OPC_ExtractField, 3, 5, // Inst{7-3} ...
// CHECK-SMALL-NEXT: /* 3 */ MCD::OPC_FilterValue, 8, 4, 0, // Skip to: 11
// CHECK-SMALL-NEXT: /* 7 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0, // Opcode: FOO16
// CHECK-SMALL-NEXT: /* 11 */ MCD::OPC_FilterValueOrFail, 9,
// CHECK-SMALL-NEXT: /* 13 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: FOO32
// CHECK-SMALL-NEXT: /* 17 */ MCD::OPC_Fail,

// CHECK-LARGE: /* 0 */ MCD::OPC_ExtractField, 3, 5, // Inst{7-3} ...
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValue, 8, 4, 0, 0, // Skip to: 12
// CHECK-LARGE-NEXT: /* 8 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0, // Opcode: FOO16
// CHECK-LARGE-NEXT: /* 12 */ MCD::OPC_FilterValue, 9, 4, 0, 0, // Skip to: 21
// CHECK-LARGE-NEXT: /* 17 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: FOO32
// CHECK-LARGE-NEXT: /* 21 */ MCD::OPC_Fail,
// CHECK-LARGE-NEXT: /* 12 */ MCD::OPC_FilterValueOrFail, 9,
// CHECK-LARGE-NEXT: /* 14 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: FOO32
// CHECK-LARGE-NEXT: /* 18 */ MCD::OPC_Fail,

// Instruction length table
// CHECK: 27,
Expand Down Expand Up @@ -88,7 +88,8 @@ def FOO32 : MyVarInst<MemOp32> {
// CHECK-LABEL: case MCD::OPC_ExtractField: {
// CHECK: makeUp(insn, Start + Len);

// CHECK-LABEL: case MCD::OPC_CheckField: {
// CHECK-LABEL: case MCD::OPC_CheckField:
// CHECK-NEXT: case MCD::OPC_CheckFieldOrFail: {
// CHECK: makeUp(insn, Start + Len);

// CHECK-LABEL: case MCD::OPC_Decode: {
Expand Down
20 changes: 10 additions & 10 deletions llvm/test/TableGen/trydecode-emission.td
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Expand Up @@ -35,11 +35,11 @@ def InstB : TestInstruction {
}

// CHECK: /* 0 */ MCD::OPC_ExtractField, 4, 4, // Inst{7-4} ...
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 16, 0, // Skip to: 23
// CHECK-NEXT: /* 7 */ MCD::OPC_CheckField, 2, 2, 0, 6, 0, // Skip to: 19
// CHECK-NEXT: /* 13 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, skip to: 19
// CHECK-NEXT: /* 19 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 23 */ MCD::OPC_Fail,
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-NEXT: /* 5 */ MCD::OPC_CheckField, 2, 2, 0, 6, 0, // Skip to: 17
// CHECK-NEXT: /* 11 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, Skip to: 17
// CHECK-NEXT: /* 17 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 21 */ MCD::OPC_Fail,

// CHECK: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }

Expand All @@ -48,11 +48,11 @@ def InstB : TestInstruction {
// CHECK-NEXT: return NumToSkip;

// CHECK-LARGE: /* 0 */ MCD::OPC_ExtractField, 4, 4, // Inst{7-4} ...
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 18, 0, 0, // Skip to: 26
// CHECK-LARGE-NEXT: /* 8 */ MCD::OPC_CheckField, 2, 2, 0, 7, 0, 0, // Skip to: 22
// CHECK-LARGE-NEXT: /* 15 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, skip to: 22
// CHECK-LARGE-NEXT: /* 22 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 26 */ MCD::OPC_Fail,
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-LARGE-NEXT: /* 5 */ MCD::OPC_CheckField, 2, 2, 0, 7, 0, 0, // Skip to: 19
// CHECK-LARGE-NEXT: /* 12 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, Skip to: 19
// CHECK-LARGE-NEXT: /* 19 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 23 */ MCD::OPC_Fail,

// CHECK-LARGE: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }

Expand Down
32 changes: 16 additions & 16 deletions llvm/test/TableGen/trydecode-emission2.td
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Expand Up @@ -32,27 +32,27 @@ def InstB : TestInstruction {
}

// CHECK: /* 0 */ MCD::OPC_ExtractField, 2, 1, // Inst{2} ...
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 31, 0, // Skip to: 38
// CHECK-NEXT: /* 7 */ MCD::OPC_ExtractField, 5, 3, // Inst{7-5} ...
// CHECK-NEXT: /* 10 */ MCD::OPC_FilterValue, 0, 24, 0, // Skip to: 38
// CHECK-NEXT: /* 14 */ MCD::OPC_CheckField, 0, 2, 3, 6, 0, // Skip to: 26
// CHECK-NEXT: /* 20 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, skip to: 26
// CHECK-NEXT: /* 26 */ MCD::OPC_CheckField, 3, 2, 0, 6, 0, // Skip to: 38
// CHECK-NEXT: /* 32 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 1, 0, 0, // Opcode: InstA, skip to: 38
// CHECK-NEXT: /* 38 */ MCD::OPC_Fail,
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-NEXT: /* 5 */ MCD::OPC_ExtractField, 5, 3, // Inst{7-5} ...
// CHECK-NEXT: /* 8 */ MCD::OPC_FilterValueOrFail, 0
// CHECK-NEXT: /* 10 */ MCD::OPC_CheckField, 0, 2, 3, 6, 0, // Skip to: 22
// CHECK-NEXT: /* 16 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, Skip to: 22
// CHECK-NEXT: /* 22 */ MCD::OPC_CheckFieldOrFail, 3, 2, 0,
// CHECK-NEXT: /* 26 */ MCD::OPC_TryDecodeOrFail, {{[0-9]+}}, {{[0-9]+}}, 1,
// CHECK-NEXT: /* 30 */ MCD::OPC_Fail,

// CHECK: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
// CHECK: if (!Check(S, DecodeInstA(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }

// CHECK-LARGE: /* 0 */ MCD::OPC_ExtractField, 2, 1, // Inst{2} ...
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 36, 0, 0, // Skip to: 44
// CHECK-LARGE-NEXT: /* 8 */ MCD::OPC_ExtractField, 5, 3, // Inst{7-5} ...
// CHECK-LARGE-NEXT: /* 11 */ MCD::OPC_FilterValue, 0, 28, 0, 0, // Skip to: 44
// CHECK-LARGE-NEXT: /* 16 */ MCD::OPC_CheckField, 0, 2, 3, 7, 0, 0, // Skip to: 30
// CHECK-LARGE-NEXT: /* 23 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, skip to: 30
// CHECK-LARGE-NEXT: /* 30 */ MCD::OPC_CheckField, 3, 2, 0, 7, 0, 0, // Skip to: 44
// CHECK-LARGE-NEXT: /* 37 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 1, 0, 0, 0, // Opcode: InstA, skip to: 44
// CHECK-LARGE-NEXT: /* 44 */ MCD::OPC_Fail,
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-LARGE-NEXT: /* 5 */ MCD::OPC_ExtractField, 5, 3, // Inst{7-5} ...
// CHECK-LARGE-NEXT: /* 8 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-LARGE-NEXT: /* 10 */ MCD::OPC_CheckField, 0, 2, 3, 7, 0, 0, // Skip to: 24
// CHECK-LARGE-NEXT: /* 17 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, Skip to: 24
// CHECK-LARGE-NEXT: /* 24 */ MCD::OPC_CheckFieldOrFail, 3, 2, 0,
// CHECK-LARGE-NEXT: /* 28 */ MCD::OPC_TryDecodeOrFail, {{[0-9]+}}, {{[0-9]+}}, 1,
// CHECK-LARGE-NEXT: /* 32 */ MCD::OPC_Fail,

// CHECK-LARGE: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
// CHECK-LARGE: if (!Check(S, DecodeInstA(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
20 changes: 10 additions & 10 deletions llvm/test/TableGen/trydecode-emission3.td
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Expand Up @@ -36,19 +36,19 @@ def InstB : TestInstruction {
}

// CHECK: /* 0 */ MCD::OPC_ExtractField, 4, 4, // Inst{7-4} ...
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 16, 0, // Skip to: 23
// CHECK-NEXT: /* 7 */ MCD::OPC_CheckField, 2, 2, 0, 6, 0, // Skip to: 19
// CHECK-NEXT: /* 13 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, skip to: 19
// CHECK-NEXT: /* 19 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 23 */ MCD::OPC_Fail,
// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-NEXT: /* 5 */ MCD::OPC_CheckField, 2, 2, 0, 6, 0, // Skip to: 17
// CHECK-NEXT: /* 11 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, Skip to: 17
// CHECK-NEXT: /* 17 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 21 */ MCD::OPC_Fail,

// CHECK: if (!Check(S, DecodeInstBOp(MI, tmp, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }

// CHECK-LARGE: /* 0 */ MCD::OPC_ExtractField, 4, 4, // Inst{7-4} ...
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 18, 0, 0, // Skip to: 26
// CHECK-LARGE-NEXT: /* 8 */ MCD::OPC_CheckField, 2, 2, 0, 7, 0, 0, // Skip to: 22
// CHECK-LARGE-NEXT: /* 15 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, skip to: 22
// CHECK-LARGE-NEXT: /* 22 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 26 */ MCD::OPC_Fail,
// CHECK-LARGE-NEXT: /* 3 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-LARGE-NEXT: /* 5 */ MCD::OPC_CheckField, 2, 2, 0, 7, 0, 0, // Skip to: 19
// CHECK-LARGE-NEXT: /* 12 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, Skip to: 19
// CHECK-LARGE-NEXT: /* 19 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 23 */ MCD::OPC_Fail,

// CHECK-LARGE: if (!Check(S, DecodeInstBOp(MI, tmp, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
20 changes: 10 additions & 10 deletions llvm/test/TableGen/trydecode-emission4.td
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Expand Up @@ -34,21 +34,21 @@ def InstB : TestInstruction {
}

// CHECK: /* 0 */ MCD::OPC_ExtractField, 250, 3, 4, // Inst{509-506} ...
// CHECK-NEXT: /* 4 */ MCD::OPC_FilterValue, 0, 17, 0, // Skip to: 25
// CHECK-NEXT: /* 8 */ MCD::OPC_CheckField, 248, 3, 2, 0, 6, 0, // Skip to: 21
// CHECK-NEXT: /* 15 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, skip to: 21
// CHECK-NEXT: /* 21 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 25 */ MCD::OPC_Fail,
// CHECK-NEXT: /* 4 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-NEXT: /* 6 */ MCD::OPC_CheckField, 248, 3, 2, 0, 6, 0, // Skip to: 19
// CHECK-NEXT: /* 13 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, // Opcode: InstB, Skip to: 19
// CHECK-NEXT: /* 19 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-NEXT: /* 23 */ MCD::OPC_Fail,

// CHECK: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }


// CHECK-LARGE: /* 0 */ MCD::OPC_ExtractField, 250, 3, 4, // Inst{509-506} ...
// CHECK-LARGE-NEXT: /* 4 */ MCD::OPC_FilterValue, 0, 19, 0, 0, // Skip to: 28
// CHECK-LARGE-NEXT: /* 9 */ MCD::OPC_CheckField, 248, 3, 2, 0, 7, 0, 0, // Skip to: 24
// CHECK-LARGE-NEXT: /* 17 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, skip to: 24
// CHECK-LARGE-NEXT: /* 24 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 28 */ MCD::OPC_Fail,
// CHECK-LARGE-NEXT: /* 4 */ MCD::OPC_FilterValueOrFail, 0,
// CHECK-LARGE-NEXT: /* 6 */ MCD::OPC_CheckField, 248, 3, 2, 0, 7, 0, 0, // Skip to: 21
// CHECK-LARGE-NEXT: /* 14 */ MCD::OPC_TryDecode, {{[0-9]+}}, {{[0-9]+}}, 0, 0, 0, 0, // Opcode: InstB, Skip to: 21
// CHECK-LARGE-NEXT: /* 21 */ MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA
// CHECK-LARGE-NEXT: /* 25 */ MCD::OPC_Fail,

// CHECK-LARGE: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }

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