FENCE.D

assembly

[
  "fence.d pred_imm, succ_imm"
]

block

[]

catalog_indices

[
  96
]

catalog_records

[
  {
    "asm": "fence.d pred_imm, succ_imm",
    "constraints": [],
    "encoding": [
      {
        "index": 0,
        "mask": "0xf00fffff",
        "match": "0x0000202b",
        "width_bits": 32
      }
    ],
    "encoding_kind": "L32",
    "fields": [
      {
        "name": "PRED_IMM",
        "pieces": [
          {
            "instruction_lsb": 24,
            "value_lsb": 0,
            "width": 4
          }
        ],
        "signedness": "encoding-defined",
        "width": 4
      },
      {
        "name": "SUCC_IMM",
        "pieces": [
          {
            "instruction_lsb": 20,
            "value_lsb": 0,
            "width": 4
          }
        ],
        "signedness": "encoding-defined",
        "width": 4
      }
    ],
    "form_id": "fence_d_32_f4783f17d84d",
    "length_bits": 32,
    "mnemonic": "FENCE.D",
    "semantic_family": "SYS",
    "semantic_group": "SYS",
    "semantic_handler": "FenceData",
    "semantic_summary": "FENCE.D records predecessor/successor ordering masks and invalidates the local reservation.",
    "status": "accepted"
  }
]

classification

[
  "sys"
]

contract

{
  "block_composition": [
    "FENCE.D executes as one scalar operation in the body of an active SYS block."
  ],
  "canonical_assembly": [
    "fence.d pred_imm, succ_imm"
  ],
  "defaults": [
    "Every displayed operand is encoded explicitly. Encoded zero is an assigned value and never denotes omission."
  ],
  "encoding_class": "standalone-encoded",
  "examples": [
    "fence.d pred_imm, succ_imm"
  ],
  "exceptions": [
    "Invalid block placement raises Illegal Block Exception before encoded-field legality or effects.",
    "A reserved encoding or rejected access raises Illegal Instruction before destination, queue, system-state, or TPC effects."
  ],
  "field_contracts": {},
  "field_zero_meanings": {
    "PRED_IMM": "Encoded zero selects value zero of the fence predecessor access-class mask.",
    "SUCC_IMM": "Encoded zero selects value zero of the fence successor access-class mask."
  },
  "legality": [
    "All sixteen values of each four-bit predecessor and successor mask are assigned."
  ],
  "memory_effects": [
    "none"
  ],
  "operands": [
    {
      "field": "PRED_IMM",
      "role": "fence predecessor access-class mask"
    },
    {
      "field": "SUCC_IMM",
      "role": "fence successor access-class mask"
    }
  ],
  "ordering": [
    "Record the exact predecessor and successor masks as one data-fence event.",
    "If either mask carries the instruction-visibility bit, advance the instruction-cache epoch."
  ],
  "standalone_opcode": true,
  "state_effects": [
    "Invalidate the local reservation, record both masks, emit the fence event, and advance TPC."
  ]
}

depends_on

[
  "PTO-SCALAR-MODEL-SYS-SEMANTICS"
]

id

PTO-SCALAR-FENCE-D

mnemonic

FENCE.D

summary

FENCE.D records predecessor/successor ordering masks and invalidates the local reservation.

surface

scalar

{
  "classification": [
    "sys"
  ],
  "documentation": "docs/scalar/sys/FENCE.D.md",
  "id": "PTO-SCALAR-FENCE-D",
  "instruction_contract": {
    "artifact": "spec/evidence/instruction-contract-closure.json",
    "mnemonic": "FENCE.D",
    "ndf_clause": "PTO-INST-SCALAR-FENCE-D"
  },
  "mnemonic": "FENCE.D",
  "readiness_subjects": [
    "ADR-0018",
    "ADR-0031",
    "ADR-0059",
    "ADR-0084"
  ],
  "semantic_tests": [
    "PTO-AVS-SYS-FENCE-D-EXEC-001",
    "PTO-AVS-SYS-FENCE-D-PLACE-001",
    "PTO-AVS-SYS-FENCE-D-VISIBLE-001",
    "PTO-AVS-SYS-FENCE-D-ZERO-001"
  ],
  "source": "asl/scalar/sys/FENCE.D.asl",
  "surface": "scalar",
  "tests": [
    "PTO-AVS-SCALAR-FENCE-D-DECODE-001",
    "PTO-AVS-SYS-FENCE-D-EXEC-001",
    "PTO-AVS-SYS-FENCE-D-PLACE-001",
    "PTO-AVS-SYS-FENCE-D-VISIBLE-001",
    "PTO-AVS-SYS-FENCE-D-ZERO-001"
  ]
}