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firrtl

CompilerUtils

object CompilerUtils extends LazyLogging

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@deprecated
Deprecated

(Since version FIRRTL 1.3) This will be removed in 1.4

Source
Compiler.scala
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  2. def getLoweringTransforms(inputForm: CircuitForm, outputForm: CircuitForm): Seq[Transform]

    Generates a sequence of Transforms to lower a Firrtl circuit

    Generates a sequence of Transforms to lower a Firrtl circuit

    inputForm

    CircuitForm to lower from

    outputForm

    CircuitForm to lower to

    returns

    Sequence of transforms that will lower if outputForm is lower than inputForm

    Annotations
    @deprecated
    Deprecated

    (Since version FIRRTL 1.3) Use a TransformManager requesting which transforms you want to run. This will be removed in 1.4.

  3. def mergeTransforms(lowering: Seq[Transform], custom: Seq[Transform]): Seq[Transform]

    Merge a Seq of lowering transforms with custom transforms

    Merge a Seq of lowering transforms with custom transforms

    Custom Transforms are inserted based on their Transform.inputForm and Transform.outputForm with any Emitters being scheduled last. Custom transforms are inserted in order at the last location in the Seq of transforms where previous.outputForm == customTransform.inputForm. If a customTransform outputs a higher form than input, getLoweringTransforms is used to relower the circuit.

    Annotations
    @deprecated
    Deprecated

    (Since version FIRRTL 1.3) Use a TransformManager requesting which transforms you want to run. This will be removed in 1.4.

    Example: 

    1. // Let Transforms be represented by CircuitForm => CircuitForm
val A = HighForm => MidForm
val B = MidForm => LowForm
val lowering = List(A, B) // Assume these transforms are used by getLoweringTransforms
// Some custom transforms
val C = LowForm => LowForm
val D = MidForm => MidForm
val E = LowForm => HighForm
// All of the following comparisons are true
mergeTransforms(lowering, List(C)) == List(A, B, C)
mergeTransforms(lowering, List(D)) == List(A, D, B)
mergeTransforms(lowering, List(E)) == List(A, B, E, A, B)
mergeTransforms(lowering, List(C, E)) == List(A, B, C, E, A, B)
mergeTransforms(lowering, List(E, C)) == List(A, B, E, A, B, C)
// Notice that in the following, custom transform order is NOT preserved (see note)
mergeTransforms(lowering, List(C, D)) == List(A, D, B, C)
    Note

    Order will be preserved for custom transforms so long as the inputForm of a latter transforms is equal to or lower than the outputForm of the previous transform.

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