[Calyx] Add a primitive cell instance operation #1636

mortbopet · 2021-08-25T11:02:10Z

This operation represents an instance of a circuit primitive. The operation function is specified by the $func parameter. The result types of the parameter must match the natural type constraints of the provided $func. I.e. for binary arithmetic operations the result and input types are expected to be the identical, whereas for boolean comparison operators input types should be identical with a 1-bit wide output type.

The available operations maps to the native Calyx logical and primitive operations, please let me know whether you think it'd be smarter to map to the std.comb operations instead (or a mix of the two).

I'd like to discuss whether we should constrain the "prim" operations to be purely combinational standard operations. This would imply that if we in the future add an operation for i.e., multi-cycle multiplication (which would have clk,reset,go,done signals), this would have to be a separate calyx component. If so, we might also want to change to operation name from calyx.prim to i.e. calyx.comb.

cgyurgyik

In Calyx, primitives are essentially wrappers for modules in SystemVerilog to be used by the Calyx language. When I see the primitive keyword, I assume that this is wrapping some lower level module. When lowering to HW, we'd like to say that every primitive maps to a module. While combinational operators are a subset of this, we do need to take into account the others as you mentioned.

It seems you're targeting (specifically) Binary Operators, so it would be nice to specify that as well. We can also take advantage of some of the traits as seen here:

circt/include/circt/Dialect/Comb/Combinational.td

Lines 27 to 33 in 6855db9

    
           // Binary operator with uniform input/result types. 
        
           class UTBinOp<string mnemonic, list<OpTrait> traits = []> : 
        
                 BinOp<mnemonic, 
        
                          traits # [SameTypeOperands, SameOperandsAndResultType]> { 
        
             let assemblyFormat = "$lhs `,` $rhs attr-dict `:` type($result)"; 
        
           }

As far as mapping (future) multi-cycle operations, that is a good question. I'm not sure constraining primitive to just combinational is the right choice. Is there a reason why you want to differentiate combinational operators from others? If so, maybe an attribute would work.

Perhaps a better name for this is PrimitiveBinaryOp / PrimitiveBinOp (or Prim if you're stern about this choice)?

include/circt/Dialect/Calyx/CalyxPrimitives.td

cgyurgyik · 2021-08-25T17:35:22Z

lib/Dialect/Calyx/CalyxOps.cpp

+void PrimOp::getAsmResultNames(OpAsmSetValueNameFn setNameFn) {
+  SmallVector<StringRef> portNames;
+  SmallVector<SmallString<8>> inNames;
+  for (size_t i = 0, e = getNumResults() - 1; i != e; ++i) {


Nit: perhaps follow left and right rather than in0, in1?

Also, e=getNumResults() - 1 can be dangerous here if getNumResults() is 0. If you want to keep this, I'd add an assert before to remain defensive.

cgyurgyik · 2021-08-25T17:39:31Z

lib/Dialect/Calyx/CalyxOps.cpp

+    // Identical input types + return type.
+  case PrimOpTypeConstraint::AllIdentical: {
+    bool AllIdenticalType = llvm::all_of(resTypes, [&](auto type) {
+      return type == primOp->getResultTypes()[0];


Nit: Save primOp->getResultTypes()[0] in a variable.

Edit: To put it more explicitly, some parts of this verification may not be necessary with the traits I mentioned in my Reviews comment.

lib/Dialect/Calyx/CalyxOps.cpp

cgyurgyik · 2021-08-25T17:45:57Z

lib/Dialect/Calyx/CalyxOps.cpp

+  case PrimOpTypeConstraint::OpsIdenticalBoolRes: {
+    if (!resTypes[resTypes.size() - 1].isInteger(1))
+      return primOp.emitOpError() << "expected 1-bit return type.";
+    if (!llvm::all_of(


std::all_of(resTypes.begin(), resTypes.end() - 1, ...) would work here as well if you want to avoid llvm::make_range. In either case the + 0 isn't necessary.

mikeurbach · 2021-08-25T19:52:28Z

I think there are good uses for primitives, but I'm a little hung up on the motivation right now. It seems like all these primitives have direct counterparts in the Comb dialect. What do we gain by defining these primitives rather than just using the Comb ops directly? Some Comb ops are being generated during the Calyx lowering passes... I think we need to answer whether Calyx should be a closed system that relies on its own combinational primitives, or keep it open and allow Comb (or others) to appear in WiresOp. If it's the latter, I'm not sure we need PrimitiveOp (which, btw, is a very general name for something that only represents different kinds of Comb logic).

To put this another way, I've considered whether Calyx really needs its own RegisterOp primitive. We could also use seq::CompRegOp, which has similar semantics. We might need a slightly different semantic, but why not add that in the seq dialect?

In general, if CIRCT is trying to be a place to host common IRs for things like combinational logic and registers, it seems like Calyx will benefit from relying on those representations (for example, run Comb canonicalization on Calyx components, then emit the Calyx for the Rust compiler to transform). IMHO, the key benefit of Calyx is related to groups and scheduling, not representing combinational operators. For another data point, a while back the LLHD dialect decided to just support Comb ops, rather than defining the same set of operations yet again.

mortbopet · 2021-08-25T19:55:14Z

@cgyurgyik thank you for the comments. I agree with you that PrimOp is not the right name for this - circuit primitives are many things, not just these binary operators. My main goal with this PR is to have a set of combinational standard operators which essentially maps 1:1 from known combinational operators from comb.
My thinking on constraining the proposed operators to purely combinational is to ensure that these operators only have input/output ports, and never any of the clk, reset, go, done ports of related to stateful Calyx components.
Furthermore, I am thinking that having a clear notion of what is combinational and what is not would be relevant for combinational groups, as mentioned by rachit, wherein we could imagine that combinational groups are validated by only having combinational operations.

In this sense, it may be better to create a new base class CombOp and factor out the type checks in the validator through having i.e. CmpCombOp and BinArithCombOp which uses traits to validate I/O types. WDYT?

Finally, I do not want to bloat the Calyx IR with operations that are not needed, or should be superseded by a more clever construct, so please let me know if you think this PR is a bit rushed.

mortbopet · 2021-08-25T20:27:04Z

@mikeurbach the overarching motivation for adding these operations (as well as the wrapped comb operations in #1630) is to be able to have the SSA values for the input ports of an arithmetic operation dominate the calyx.wires/control ops, such that they may be assigned to and referenced by multiple groups/control:

calyx.component (...) {
  %comb.left, %comb.right, %comb.out = calyx.prim "comb" gt : i32, i32, i1
  calyx.wires {
    calyx.group @Group1 {
      calyx.assign %comb.left = ...
      calyx.assign %comb.right = ...
      calyx.group_done = ...

    }
  }
  calyx.control {
    calyx.if %comb.out with @Group1 {
      ...
    }
  }
}

I agree that it does seem a bit redundant to add new operations which only act as wrappers around comb operations to make them appear like a hardware instance (all ports exposed as SSA values).

mikeurbach · 2021-08-25T20:32:19Z

Thanks @mortbopet. I overlooked that, but it is a very real need based on how Calyx does things (sidebar: maybe we can revisit this core design decision in Calyx). I've had to overcome this impedance mismatch myself, when experimenting with the FSM dialect (notes here). Thinking about it in that light, defining an FSM primitive would have made my life easier.

Given this, I think this is a good approach:

CombOp and factor out the type checks in the validator through having i.e. CmpCombOp and BinArithCombOp which uses traits to validate I/O types. WDYT?

CombOp could also have any hooks needed by Calyx to convert into Comb ops down the line.

cgyurgyik · 2021-08-26T02:16:26Z

In this sense, it may be better to create a new base class CombOp and factor out the type checks in the validator through having i.e. CmpCombOp and BinArithCombOp which uses traits to validate I/O types. WDYT?

What you're saying makes sense. You want a class to represent specifically combinational operations. One question comes to mind that may have a simple answer.. how will you differentiate combinational operations if their only difference is the base class? Do you plan on adding some trait as well to this base class? I imagine there are multiple ways to do this, mostly curious what your thought process is.

rachitnigam · 2021-08-26T06:47:48Z

Some background on primitive: Calyx uses the extern keyword to point to a system verilog with the implementation of several module. The primitive keyword is used to define the interface of those Verilog implementation and add additional metadata like the latency. After generating Verilog, the Calyx compiler prepends all of the extern Verilog files to the generated output to bring all the Verilog implementations in scope (lack of namespacing is an implementation detail and not a long term choice).

Currently, primitive is used for two reasons:

To define the basic building blocks of Calyx. For example, there is no representation of a "register" in Calyx. All Calyx knows about is ports.
Interface with parameterized components. Calyx does not currently support parameterization (we hope to in the future) so any parameterized component must be written in Verilog and exposed as a primitive.

That said, summarizing the current options for Calyx + CIRCT:

Calyx-specific primitives: Current choice of the native Calyx compiler. Core primitives are defined within Calyx and certain compiler passes (like lowering and FSM generation) rely on specific semantics of these operations (such as adders being combinational).
comb-dialect in Calyx: Obvious benefits is the combinational groups and components can "just" reuse the optimization written for the comb dialect. The Calyx compiler can, similar to (1), rely on the semantics of adders etc.
Black-box CIRCT externs: In this world, primitives are simply defined to components with a callable interface that Calyx can use to interact with but is not allowed to make any assumptions about. The upside is that we can choose whatever representation of the components (handshake, staticlogic, etc.) as long as we can provide an interface to interact with Calyx. The downside is that the compiler really can't make any assumptions about the components which might impede optimizations and passes.

I think long-term, the correct choice is probably a combination of (2) and (3)--a certain set of core operations are represented in a dialect whose semantics are understood by Calyx and other primitives (like a custom RTL implementation of sqrt or a systolic array) are represented as blackboxes with an interface.

I agree with @mikeurbach that long-term, simply using comb operators within the Calyx dialect is a good idea (and something I'd be very excited about). I'd be curious to hear from @mikeurbach & @mortbopet on what changes to the Native Calyx representation would make usage of comb possible.

mortbopet · 2021-08-26T08:20:43Z

@cgyurgyik yes i would imagine that such explicitly combinational operations would be marked by i.e. a trait. But, a disclaimer, i am quite new to everything-MLIR, so there might very well be more clever ways of doing this that i am unaware of!

On using comb ops:
Off the top of my head, a simple solution to be able to use comb operations without any of these wrapper-like operations or components, we could introduce the concept of signals/wires. Signals are then driven by calyx.assign operations inside a calyx.group. The core issue with instance sharing is that the input port definition must dominate any assignment thereof, which sort of is the whole reason for a signal/wire construct.

calyx.component (...) {
  %comb.left, %comb.right = calyx.wire : i32, i32
  %comb.out = comb.icmp gt %comb.left, %comb.right : i32
  calyx.wires {
    calyx.group @Group1 {
      calyx.assign %comb.left = ...
      calyx.assign %comb.right = ...
      calyx.group_done = ...
    }
    
  }
  calyx.control {
    calyx.if %comb.out with @Group1 {
      ...
    }
  }
}

This could lend itself into creating larger combinational circuits that are driven by wires.

calyx.component (...) {
  %comb.in0, %comb.in1, %comb.in2 = calyx.wire : i32, i32, i1
  %c42_i32 = hw.constant 42 : i32
  %mux.out = comb.mux %comb.in2, %comb.in0, %comb.in1 : i32
  %mul.out = comb.mul %mux.out, %c42_i32 : i32
  %gt.out = comb.icmp gt %mul.out, %comb.in0 : i32
  calyx.wires {
    calyx.group @Group1 {
      calyx.assign %comb.in0 = ...
      calyx.assign %comb.in1 = ...
      calyx.assign %comb.in2 = ...
      calyx.group_done = ...
    }
    
  }
  calyx.control {
    calyx.if %gt.out with @Group1 {
      ...
    }
  }
}

Such larger combinational circuits could be factored out into distinct combinational functions (Which we could imagine that a StdToComb pass will create...):

// A valid function has been fully lowered to `comb` operations, and contains no state
func @foo(%in0 : i32, %in1: i32, %in2: i1) -> i1 {
  %c42_i32 = hw.constant 42 : i32
  %mux.out = comb.mux %comb.in2, %comb.in0, %comb.in1 : i32
  %mul.out = comb.mul %mux.out, %c42_i32 : i32
  %gt.out = comb.icmp gt %mul.out, %comb.in0 : i32
  return %gt.out : i1
}

calyx.component (...) {
  %comb.in0, %comb.in1, %comb.in2 = calyx.wire : i32, i32, i1
  %foo.out = calyx.comb "foo" @foo (%comb.in0, %comb.in1, %comb.in2) : i1;
  calyx.wires {
    calyx.group @Group1 {
      calyx.assign %comb.in0 = ...
      calyx.assign %comb.in1 = ...
      calyx.assign %comb.in2 = ...
      calyx.group_done = ...
    }
    
  }
  calyx.control {
    calyx.if %foo.out with @Group1 {
      ...
    }
  }
}

cgyurgyik · 2021-08-26T17:29:15Z

comb-dialect in Calyx: Obvious benefits is the combinational groups and components can "just" reuse the optimization written for the comb dialect. The Calyx compiler can, similar to (1), rely on the semantics of adders etc.

I think the consensus here is that using Calyx-like primitives will allow writing Calyx passes (such as sharing) easier. Then, these can be lowered to Comb/HW dialect. @mortbopet does provide an alternative above, though I haven't thought about it carefully enough to determine whether its a better path. At first glance, it seems like quite a bit more boilerplate (essentially two operations per primitive).

mikeurbach · 2021-08-30T16:02:39Z

a simple solution to be able to use comb operations without any of these wrapper-like operations or components, we could introduce the concept of signals/wires

I think this is generally the way forward if we want to explore option 2. The Calyx MLIR dialect has taken the approach used by FIRRTL, where the "instance" operation creates SSA values for inputs and outputs, which are then "connected". This is somewhat at odds with the Comb dialect, where the inputs to an operation are operands, and the outputs are results. In order to preserve SSA dominance, introducing an operation to declare a "wire" is a very reasonable solution. This is what I was imagining if we wanted to support Comb directly within Calyx.

Another approach I've toyed with in my head is to just throw out SSA dominance, and make the body of a Calyx component a graph region. It might be worth pulling on that thread if it makes sense, but that would be a pretty major design change and shouldn't be taken lightly.

mortbopet · 2021-09-01T17:06:26Z

@mikeurbach @cgyurgyik I've refactored the commit to define separate classes for arithmetic/logic binary operators.

Type constraints now checked by SameTypeConstraint rather than custom logic.
The naming convention now follows a "library op" convention to indicate that these are operators which map to things in the native Calyx standard library.
All library operators are prefixed lib_ in their mnemonic.

From my point of view, whatever we end up choosing should not necessarily be seen as set in stone - as long as

we have lowering targets for std arithmetic and
these are semantically in line with what we'd like to export to Calyx native

then we are good to go for now, in terms of being able to achieve I/O to/from Calyx native.

cgyurgyik

A few nits, but mostly LGTM. Can you either (1) update the emitter, or (2) open an issue so that we can emit these properly (and include the correct imports)?

lib/Dialect/Calyx/CalyxOps.cpp

test/Dialect/Calyx/errors.mlir

cgyurgyik · 2021-09-01T17:31:54Z

CC @rachitnigam for review as well.

cgyurgyik

A few more comments.

Edit: Approval comes with LGTMs from Rachit and Mike.

include/circt/Dialect/Calyx/CalyxPrimitives.td

cgyurgyik · 2021-09-01T17:36:10Z

include/circt/Dialect/Calyx/CalyxPrimitives.td

+def GeLibOp  : BoolBinLibOp<"ge"> {}
+def LeLibOp  : BoolBinLibOp<"le"> {}
+
+class ArithBinLibOp<string mnemonic> : CalyxLibraryOp<mnemonic, [


What we want eventually for both the arithmetic and boolean binary operations is access to direct ports, and the necessary functions for the CellInterface (#1597).

E.g.

circt/include/circt/Dialect/Calyx/CalyxPrimitives.td

Lines 46 to 60 in c227f5c

let extraClassDeclaration = [{

SmallVector<StringRef> portNames() {

return {"in", "write_en", "clk", "reset", "out", "done"};

}

SmallVector<Direction> portDirections() {

return { Input, Input, Input, Input, Output, Output };

}

Value inPort() { return getResult(0); }

Value writeEnPort() { return getResult(1); }

Value clkPort() { return getResult(2); }

Value resetPort() { return getResult(3); }

Value outPort() { return getResult(4); }

Value donePort() { return getResult(5); }

}];

CellInterface is in progress! I should have a PR today.

include/circt/Dialect/Calyx/CalyxPrimitives.td

mikeurbach · 2021-09-01T18:25:33Z

I mentioned in the ODM last week some thoughts about representing a library of primitives and lowering into them from Standard. I tried to capture that over here for discussion: https://llvm.discourse.group/t/infrastructure-for-converting-standard-to-comb-or-primitives/4224. Whatever we choose here, hopefully that can be useful!

mortbopet · 2021-09-01T19:11:15Z

I mentioned in the ODM last week some thoughts about representing a library of primitives and lowering into them from Standard. I tried to capture that over here for discussion: https://llvm.discourse.group/t/infrastructure-for-converting-standard-to-comb-or-primitives/4224. Whatever we choose here, hopefully that can be useful!

I am definitely in favor of doing something akin to what is proposed in the post - this is also why i see this PR as only a temporary thing, mainly to be used while we're in the phase of trying out flows between CIRCT and Calyx native.

cgyurgyik · 2021-09-01T21:00:01Z

Just wanted to say clean-up looks great. Thanks @mortbopet!!

This operation represents an instance of a circuit primitive. The operation function is specified by the `$func` parameter. The result types of the parameter must match the natural type constraints of the provided `$func`. I.e. for binary arithmetic operations the result and input types are expected to be the identical, whereas for boolean comparison operators input types should be identical with a 1-bit wide output type. The available operations maps to the [native Calyx logical and primitive operations](https://github.com/cucapra/calyx/blob/master/primitives/core.futil), please let me know whether you think it'd be smarter to map to the `std.comb` operations instead (or a mix of the two). I'd like to discuss whether we should constrain the "prim" operations to be purely combinational standard operations. This would imply that if we in the future add an operation for i.e., multi-cycle multiplication (which would have `clk,reset,go,done` signals), this would have to be a separate calyx component. If so, we might also want to change to operation name from `calyx.prim` to i.e. `calyx.comb`.

…cializations

mortbopet · 2021-09-02T10:53:57Z

@rachitnigam @mikeurbach @cgyurgyik rebased and refactored the PR for the ops to implemented the cell interface + added slice and pad operators.

mikeurbach

Awesome, looks good to me!

cgyurgyik · 2021-09-02T15:35:21Z

LGTM !

rachitnigam · 2021-09-03T03:10:46Z

Looks good!

rachitnigam · 2021-09-03T04:08:45Z

Companion commit in Calyx native to emit primitives in CIRCT syntax: calyxir/calyx@9a888b9

mortbopet requested review from mikeurbach and cgyurgyik August 25, 2021 11:02

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Experimentation with FSM dialect during Calyx lowering #1522

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[Calyx] Round tripping with the native Calyx compiler #1690

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[Calyx] Add emitters for library operations #1694

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mortbopet force-pushed the calyx/primitiveop branch from dd85d2d to 06d2971 Compare September 1, 2021 19:16

mortbopet added 4 commits September 2, 2021 10:46

[WIP] review comments

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Refactor to a shared base "LibraryOp" component + binary operator spe…

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…cializations

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Add slice and pad operators

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[Calyx] Add a primitive cell instance operation #1636

[Calyx] Add a primitive cell instance operation #1636

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	// Binary operator with uniform input/result types.
	class UTBinOp<string mnemonic, list<OpTrait> traits = []> :
	BinOp<mnemonic,
	traits # [SameTypeOperands, SameOperandsAndResultType]> {
	let assemblyFormat = "$lhs `,` $rhs attr-dict `:` type($result)";
	}

	let extraClassDeclaration = [{
	SmallVector<StringRef> portNames() {
	return {"in", "write_en", "clk", "reset", "out", "done"};
	}
	SmallVector<Direction> portDirections() {
	return { Input, Input, Input, Input, Output, Output };
	}

	Value inPort() { return getResult(0); }
	Value writeEnPort() { return getResult(1); }
	Value clkPort() { return getResult(2); }
	Value resetPort() { return getResult(3); }
	Value outPort() { return getResult(4); }
	Value donePort() { return getResult(5); }
	}];

[Calyx] Add a primitive cell instance operation #1636

[Calyx] Add a primitive cell instance operation #1636

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