C.SEXT.B

assembly

[
  "c.sext.b srcL, ->t"
]

block

[]

catalog_indices

[
  39
]

catalog_records

[
  {
    "asm": "c.sext.b srcL, ->t",
    "constraints": [],
    "encoding": [
      {
        "index": 0,
        "mask": "0xf83f",
        "match": "0x401c",
        "width_bits": 16
      }
    ],
    "encoding_kind": "C16",
    "fields": [
      {
        "name": "SrcL",
        "pieces": [
          {
            "instruction_lsb": 6,
            "value_lsb": 0,
            "width": 5
          }
        ],
        "signedness": "encoding-defined",
        "width": 5
      }
    ],
    "form_id": "c_sext_b_16_8ffd07d15409",
    "length_bits": 16,
    "mnemonic": "C.SEXT.B",
    "semantic_family": "ALU",
    "semantic_group": "ALU",
    "semantic_handler": "ExtendScalarValue",
    "semantic_summary": "C.SEXT.B sign-extends SrcL[7:0] to XLEN and pushes the result to T.",
    "status": "accepted"
  }
]

classification

[
  "alu"
]

contract

{
  "block_composition": [
    "none"
  ],
  "canonical_assembly": [
    "c.sext.b srcL, ->t"
  ],
  "defaults": [
    "Every encoded source, immediate, and explicit destination field is required; no field can be omitted.",
    "The mnemonic fixes immediate signedness, selected source width, and implicit-versus-explicit destination behavior."
  ],
  "encoding_class": "standalone-encoded",
  "examples": [
    "c.sext.b srcl, ->t"
  ],
  "exceptions": [
    "Materialization, movement, and extension are total fixed-width operations and raise no arithmetic exception.",
    "An unavailable selected T/U source raises Fault_IllegalInstruction before the destination effect and before TPC advances."
  ],
  "field_contracts": {},
  "field_zero_meanings": {
    "SrcL": "Encoded zero reads the architectural zero GPR."
  },
  "legality": [
    "SrcL codes 0..23 select absolute GPRs, 24..27 select T#1..T#4, and 28..31 select U#1..U#4 without consumption.",
    "The compressed form has no destination field and always pushes exactly one result to T.",
    "Every encoded operand value is assigned; fixed encoding bits must match the canonical form."
  ],
  "memory_effects": [
    "none"
  ],
  "operands": [
    {
      "field": "SrcL",
      "role": "Reg5 source"
    }
  ],
  "ordering": [
    "Snapshot any Reg5 source before the destination effect.",
    "Publish the result, then advance TPC by the encoded instruction length."
  ],
  "standalone_opcode": true,
  "state_effects": [
    "Sign-extend source bit 7 through the XLEN result.",
    "Push the complete XLEN result to T. The source queue is non-consuming, and no explicit destination encoding exists.",
    "No memory, reservation, descriptor, numeric-status, block, privilege, branch-target, or other control state changes. Successful execution advances TPC by two bytes."
  ]
}

depends_on

[
  "PTO-BLOCK-MODEL-SCHEMA-PROFILE-ENCODING"
]

id

PTO-SCALAR-C-SEXT-B

mnemonic

C.SEXT.B

summary

C.SEXT.B sign-extends SrcL[7:0] to XLEN and pushes the result to T.

surface

scalar

{
  "classification": [
    "alu"
  ],
  "documentation": "docs/scalar/alu/C.SEXT.B.md",
  "id": "PTO-SCALAR-C-SEXT-B",
  "instruction_contract": {
    "artifact": "spec/evidence/instruction-contract-closure.json",
    "mnemonic": "C.SEXT.B",
    "ndf_clause": "PTO-INST-SCALAR-C-SEXT-B"
  },
  "mnemonic": "C.SEXT.B",
  "readiness_subjects": [
    "ADR-0026",
    "ADR-0059"
  ],
  "semantic_tests": [
    "PTO-AVS-SCALAR-C-SEXT-B-MATERIALIZE-001"
  ],
  "source": "asl/scalar/alu/C.SEXT.B.asl",
  "surface": "scalar",
  "tests": [
    "PTO-AVS-SCALAR-C-SEXT-B-DECODE-001",
    "PTO-AVS-SCALAR-C-SEXT-B-MATERIALIZE-001"
  ]
}