C.ADD

assembly

[
  "c.add srcL, srcR, ->t"
]

block

[]

catalog_indices

[
  23
]

catalog_records

[
  {
    "asm": "c.add srcL, srcR, ->t",
    "constraints": [],
    "encoding": [
      {
        "index": 0,
        "mask": "0x003f",
        "match": "0x0008",
        "width_bits": 16
      }
    ],
    "encoding_kind": "C16",
    "fields": [
      {
        "name": "SrcL",
        "pieces": [
          {
            "instruction_lsb": 6,
            "value_lsb": 0,
            "width": 5
          }
        ],
        "signedness": "encoding-defined",
        "width": 5
      },
      {
        "name": "SrcR",
        "pieces": [
          {
            "instruction_lsb": 11,
            "value_lsb": 0,
            "width": 5
          }
        ],
        "signedness": "encoding-defined",
        "width": 5
      }
    ],
    "form_id": "c_add_16_85136d1e4904",
    "length_bits": 16,
    "mnemonic": "C.ADD",
    "semantic_family": "ALU",
    "semantic_group": "ALU",
    "semantic_handler": "ScalarBinary",
    "semantic_summary": "C.ADD snapshots two complete Reg5 sources, adds SrcL and SrcR, and pushes the wrapping XLEN result to T.",
    "status": "accepted"
  }
]

classification

[
  "alu"
]

contract

{
  "block_composition": [
    "none"
  ],
  "canonical_assembly": [
    "c.add srcL, srcR, ->t"
  ],
  "defaults": [
    "SrcL and SrcR are required encoded fields; neither source can be omitted.",
    "The destination is not encoded: every successful form pushes exactly one result to T."
  ],
  "encoding_class": "standalone-encoded",
  "examples": [
    "c.add t#1, u#1, ->t"
  ],
  "exceptions": [
    "Addition is a total fixed-width operation and raises no arithmetic exception.",
    "An unavailable selected T/U source raises Fault_IllegalInstruction before the T push, before TPC advances, and before any other effect."
  ],
  "field_contracts": {},
  "field_zero_meanings": {
    "SrcL": "Encoded zero reads the architectural zero GPR.",
    "SrcR": "Encoded zero reads the architectural zero GPR."
  },
  "legality": [
    "Each source code 0..23 selects an absolute GPR, 24..27 selects T#1..T#4, and 28..31 selects U#1..U#4 without consumption.",
    "Duplicate, absolute-relative, and relative-relative source pairs are legal. Every encoded source value is assigned."
  ],
  "memory_effects": [
    "none"
  ],
  "operands": [
    {
      "field": "SrcL",
      "role": "left Reg5 source"
    },
    {
      "field": "SrcR",
      "role": "right Reg5 source"
    }
  ],
  "ordering": [
    "Snapshot both sources before pushing the destination so aliases observe the pre-instruction queue state.",
    "Push the result as the newest T entry, then advance TPC by two bytes."
  ],
  "standalone_opcode": true,
  "state_effects": [
    "Compute addition on the two complete XLEN source values.",
    "Push exactly one XLEN result to T. Existing T entries shift toward older indices, the former T#4 is discarded, and no source is consumed.",
    "No GPR, U queue, memory, reservation, descriptor, numeric-status, block, privilege, predicate, or other control state changes. Successful execution advances TPC by two bytes."
  ]
}

depends_on

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

id

PTO-SCALAR-C-ADD

mnemonic

C.ADD

summary

C.ADD snapshots two complete Reg5 sources, adds SrcL and SrcR, and pushes the wrapping XLEN result to T.

surface

scalar

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