'comb' Dialect

Types and operations for comb dialect This dialect defines the comb dialect, which is intended to be a generic representation of combinational logic outside of a particular use-case.

Operation definition ¶

comb.add (::circt::comb::AddOp) ¶

Syntax:

operation ::= `comb.add` $inputs attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.and (::circt::comb::AndOp) ¶

Syntax:

operation ::= `comb.and` $inputs attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.concat (::circt::comb::ConcatOp) ¶

Concatenate a variadic list of operands together.

Syntax:

operation ::= `comb.concat` $inputs attr-dict `:` functional-type($inputs, results)

See the HW-SV rationale document for details on operand ordering.

Operands: ¶

Results: ¶

comb.divs (::circt::comb::DivSOp) ¶

Syntax:

operation ::= `comb.divs` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.divu (::circt::comb::DivUOp) ¶

Syntax:

operation ::= `comb.divu` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.extract (::circt::comb::ExtractOp) ¶

Extract a range of bits into a smaller value, lowBit specifies the lowest bit included.

Syntax:

operation ::= `comb.extract` $input `from` $lowBit attr-dict `:` functional-type($input, $result)

Attributes: ¶

Operands: ¶

Results: ¶

comb.icmp (::circt::comb::ICmpOp) ¶

Compare two integer values

Syntax:

operation ::= `comb.icmp` $predicate $lhs `,` $rhs  attr-dict `:` type($lhs)

This operation compares two integers using a predicate. If the predicate is true, returns 1, otherwise returns 0. This operation always returns a one bit wide result.

    %r = hw.icmp eq %a, %b : i4

Attributes: ¶

Operands: ¶

Results: ¶

comb.merge (::circt::comb::MergeOp) ¶

Electrically merge signals together as if connected by a wire.

Syntax:

operation ::= `comb.merge` $inputs attr-dict `:` type($result)

This operation merges multiple signals together as if they were connected to a single wire. Presumably at most one of them should be a Z state at any given time otherwise you’d get a short circuit.

This operation allows modeling multiconnect semantics in SSA.

  %result = hw.merge %a, %b, %c : t1

Operands: ¶

Results: ¶

comb.mods (::circt::comb::ModSOp) ¶

Syntax:

operation ::= `comb.mods` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.modu (::circt::comb::ModUOp) ¶

Syntax:

operation ::= `comb.modu` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.mul (::circt::comb::MulOp) ¶

Syntax:

operation ::= `comb.mul` $inputs attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.mux (::circt::comb::MuxOp) ¶

Return one or the other operand depending on a selector bit

Syntax:

operation ::= `comb.mux` $cond `,` $trueValue `,` $falseValue attr-dict `:` type($result)

  %0 = mux %pred, %tvalue, %fvalue : i4

Operands: ¶

Results: ¶

comb.or (::circt::comb::OrOp) ¶

Syntax:

operation ::= `comb.or` $inputs attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.parity (::circt::comb::ParityOp) ¶

Syntax:

operation ::= `comb.parity` $input attr-dict `:` type($input)

Operands: ¶

Results: ¶

comb.sext (::circt::comb::SExtOp) ¶

Sign extend an integer to an equal or larger integer

Syntax:

operation ::= `comb.sext` $input attr-dict `:` functional-type($input, $result)

Operands: ¶

Results: ¶

comb.shl (::circt::comb::ShlOp) ¶

Syntax:

operation ::= `comb.shl` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.shrs (::circt::comb::ShrSOp) ¶

Syntax:

operation ::= `comb.shrs` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.shru (::circt::comb::ShrUOp) ¶

Syntax:

operation ::= `comb.shru` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.sub (::circt::comb::SubOp) ¶

Syntax:

operation ::= `comb.sub` $lhs `,` $rhs  attr-dict `:` type($result)

Operands: ¶

Results: ¶

comb.xor (::circt::comb::XorOp) ¶

Syntax:

operation ::= `comb.xor` $inputs attr-dict `:` type($result)

Operands: ¶

Results: ¶