TROWMIN

1// PTO-INSTRUCTION: {"assembly":["TROWMIN <bundle operands>"],"block":["BSTART.SFU TROWMIN, DataType","B.DATR PadValue (optional)","B.DIM LB0=ValidCol","B.DIM LB1=ValidRow (optional)","B.DIM LB2=Col (optional)","B.IOT SrcTile, mask=PE_MASK, <last>, ->DstTile<TSize>","BSTOP"],"catalog_indices":[42],"catalog_records":[{"arguments":[{"constant":"TileReduction_MIN"},{"constant":"TileAxis_Row"},{"operand":"destination0"},{"operand":"source0"}],"command_mnemonic":"BSTART.TEPL","contract_status":"reviewed-complete","datr_contract":{"allowed_nonzero_fields":["PadValueOrByteId"],"pad_union":"pad-value"},"disposition":"accepted-direct-operation","effect_contract":"ExecuteTileReduction","family":"TEPL","fault_contract":"ExecuteTileInstruction","function":2,"legality_handler":"TileOperandsLegal_ExecuteTileReduction","mode":2,"name":"TROWMIN","operands":[{"field":"destination0","role":"new Local same-type numeric destination"},{"field":"source0","role":"persistent Local numeric source"}],"restart_contract":"CompleteBundleAtWithAcceptedApplicabilityRules","selector":"0x042","semantic_handler":"ExecuteTileReduction","state_effects":["operand:destination0:new-local-same-type-destination","operand:source0:persistent-local-numeric-source","runtime:CurrentBundlePadValue:numeric-padding"]}],"classification":["reduce-and-expand","row-reduction"],"contract":{"block_composition":["BSTART.SFU TROWMIN, DataType","B.DATR PadValue (optional)","B.DIM LB0=ValidCol","B.DIM LB1=ValidRow (optional)","B.DIM LB2=Col (optional)","B.IOT SrcTile, mask=PE_MASK, <last>, ->DstTile<TSize>","BSTOP"],"canonical_assembly":["TROWMIN <bundle operands>"],"defaults":["LB0 is required and supplies nonzero ValidCol. Omitted LB1 selects ValidRow=1. Omitted LB2 selects Col=ValidCol; every explicitly present dimension must be nonzero.","Omitted B.DATR selects PadValue=Null. Explicit PadValue 00, 01, 10, and 11 select Zero, Max, Min, and Null.","TROWMIN computes a typed increasing-column TMIN fold initialized from column zero; the scan order is architectural and tree reassociation is not permitted."],"encoding_class":"selector-encoded-block-operation","examples":["BSTART.SFU TROWMIN, DataType; B.DATR PadValue (optional); B.DIM LB0=ValidCol; B.DIM LB1=ValidRow (optional); B.DIM LB2=Col (optional); B.IOT SrcTile, mask=PE_MASK, <last>, ->DstTile<TSize>; BSTOP"],"exceptions":["A malformed binding stream, B.IOR or B.IOS presence, missing or zero dimension, unsupported DataType, non-row-major source, undefined source element, invalid source encoding, or mismatched source geometry raises Fault_TileLegality before effects.","An unrepresentable result shape, insufficient TSize, unavailable renamed destination, or exhausted Tile capacity raises Fault_TileAllocation before destination publication.","Floating numeric status is accumulated across the architectural fold and publishes atomically with the result."],"field_contracts":{"B.DATR.PadValueOrByteId":{"ref":"PTO-FIELD-BLOCK-PADVALUE-OR-BYTEID"}},"field_zero_meanings":{"B.DATR.PadValueOrByteId":"Zero padding when B.DATR is present; omission selects Null.","B.DIM.LB0":"Zero is illegal because LB0 is required and ValidCol is nonzero.","B.DIM.LB1":"Omission selects ValidRow one; an explicitly encoded zero is illegal.","B.DIM.LB2":"Omission selects Col equal to ValidCol; an explicitly encoded zero is illegal."},"legality":["TROWMIN is selected by the TEPL raw encoding carrier Mode 2 Function 2; canonical execution-engine assembly is BSTART.SFU and there is no standalone opcode.","Exactly one terminating Local B.IOT supplies one persistent Local source and one newly allocated Local destination. B.IOR, B.IOS, a second B.IOT, or a nonterminating binding is illegal.","The source DataType is exactly S32, U32, FP32, S16, U16, FP16, BF16, S8, or U8.","The destination DataType equals the source DataType.","The source is a fully defined row-major numeric Tile whose ValidRow, ValidCol, and physical Col exactly match the B.DIM-derived source geometry; every constrained floating encoding is valid.","The destination has ValidRow equal to source.ValidRow, ValidCol and physical Col equal to one, and capacity-derived physical Rows.","PadValueOrByteId is the only applicable B.DATR field. Source and destination share one PE_MASK; PE_MASK=0000 is a strict no-op before descriptor reads, allocation, faults, status, or payload effects."],"memory_effects":["none"],"operands":[{"field":"destination0","role":"new Local same-type numeric destination"},{"field":"source0","role":"persistent Local numeric source"}],"ordering":["Complete schema, attribute, dimension, type, descriptor, source-definedness, source-encoding, mask, capacity, name-allocation, and storage preflight precedes the source snapshot.","The source is scanned in strictly increasing column order; the source persists and is never modified.","Numeric status, all valid results, selected padding definedness, and the renamed destination descriptor publish atomically; rejection publishes none."],"standalone_opcode":false,"state_effects":["For each valid row, compute a typed increasing-column TMIN fold initialized from column zero.","Write the typed reduction value without widening integer arithmetic or reassociating the fold.","Apply the selected PadValue to physical destination coordinates outside the valid result rectangle, then publish the complete result atomically."]},"depends_on":["PTO-BLOCK-MODEL-DISPATCH-REDUCTION-SCHEMA","PTO-TILE-MODEL-EXECUTION-REDUCTION","PTO-TILE-MODEL-LEGALITY-REDUCTION-AND-EXPANSION"],"engine":"SFU","id":"PTO-TILE-TROWMIN","mnemonic":"TROWMIN","summary":"Reduce each valid row to its minimum with exact typed column-order semantics.","surface":"tile"}2// PTO-REVIEW: {"review_method":"formal-definition-read","outcome":"FORMAL-COMPLETE","reviewed_fields":["assembly","encoding","defaults","operation","state","memory","ordering","faults","reserved"]}3// NDF-BEGIN: PTO-TROWMIN-CONTRACT-0014// ndf: kind=contract level=L1 layer=tile status=accepted5// TROWMIN MUST select SFU Mode 2 Function 2 and MUST compute a typed6// increasing-column TMIN fold initialized from column zero over one fully7// defined Local source.8// The source geometry MUST match the B.DIM-derived shape.9// The destination MUST use the source DataType and integer arithmetic MUST10// remain at the selected element width.11// Only PadValueOrByteId MAY be nondefault in B.DATR.12// Complete preflight and source snapshot MUST precede atomic result,13// status, padding, and descriptor publication.14// NDF-END: PTO-TROWMIN-CONTRACT-00115// DOC-BEGIN: decode16readonly func InstructionContractOperation_TROWMIN() => TileOperation17begin18    return TileOperation_TROWMIN;19end;20// DOC-END: decode21// DOC-BEGIN: operation22pure func InstructionContractDataTypeLegal_TROWMIN(23    data_type: TileDataType) => boolean24begin25    return TileVecArithmeticDataTypeSupported(data_type);26end;27
28readonly func InstructionContractOperandsLegal_TROWMIN(29    destination: TileIndex,30    source: TileIndex) => boolean31begin32    return TileOperandsLegal_ExecuteTileReduction(33        TileReduction_MIN,34        TileAxis_Row,35        destination,36        source);37end;38
39readonly func InstructionContractHandler_TROWMIN() => TileSemanticHandler40begin41    return TileHandler_ExecuteTileReduction;42end;43
44func InstructionContractExecute_TROWMIN(45    destination: TileIndex,46    source: TileIndex)47begin48    assert InstructionContractOperandsLegal_TROWMIN(49        destination,50        source);51    ExecuteTileReduction(52        TileReduction_MIN,53        TileAxis_Row,54        destination,55        source);56end;57// DOC-END: operation58