82acc31fd4
OPC_Decode is a specialized OPC_TryDecode. The difference between them is that OPC_TryDecode performs a "completeness check", while OPC_Decode asserts that the check passes. The check is just a boolean test, which is nothing compared to the complexity of the decoding process, so there is no point in having a special opcode that optimizes the check.
54 lines
1.9 KiB
TableGen
54 lines
1.9 KiB
TableGen
// RUN: llvm-tblgen -gen-disassembler -I %p/../../../include %s | FileCheck %s
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// RUN: llvm-tblgen -gen-disassembler --large-decoder-table -I %p/../../../include %s | FileCheck %s --check-prefix=CHECK-LARGE
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// Test for OPC_ExtractField/OPC_CheckField with start bit > 255.
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// These large start values may arise for architectures with long instruction
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// words.
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include "llvm/Target/Target.td"
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def archInstrInfo : InstrInfo { }
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def arch : Target {
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let InstructionSet = archInstrInfo;
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}
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class TestInstruction : Instruction {
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let Size = 64;
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let OutOperandList = (outs);
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let InOperandList = (ins);
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field bits<512> Inst;
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field bits<512> SoftFail = 0;
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}
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def InstA : TestInstruction {
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let Inst{509-502} = {0,0,0,0,?,?,?,?};
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let AsmString = "InstA";
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}
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def InstB : TestInstruction {
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let Inst{509-502} = {0,0,0,0,0,0,?,?};
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let AsmString = "InstB";
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let DecoderMethod = "DecodeInstB";
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let hasCompleteDecoder = 0;
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}
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// CHECK: /* 0 */ OPC_CheckField, 250, 3, 4, 0,
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// CHECK-NEXT: /* 5 */ OPC_Scope, 9, 0, // end scope at 17
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// CHECK-NEXT: /* 8 */ OPC_CheckField, 248, 3, 2, 0,
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// CHECK-NEXT: /* 13 */ OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0,
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// CHECK-NEXT: /* 17 */ OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA, DecodeIdx: 1
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// CHECK-NEXT: };
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// CHECK: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
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// CHECK-LARGE: /* 0 */ OPC_CheckField, 250, 3, 4, 0,
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// CHECK-LARGE-NEXT: /* 5 */ OPC_Scope, 9, 0, 0, // end scope at 18
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// CHECK-LARGE-NEXT: /* 9 */ OPC_CheckField, 248, 3, 2, 0,
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// CHECK-LARGE-NEXT: /* 14 */ OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0,
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// CHECK-LARGE-NEXT: /* 18 */ OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: InstA, DecodeIdx: 1
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// CHECK-LARGE-NEXT: };
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// CHECK-LARGE: if (!Check(S, DecodeInstB(MI, insn, Address, Decoder))) { DecodeComplete = false; return MCDisassembler::Fail; }
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