Interval Data Type Support for Chisel (#1210)

Plan to be released with 3.3.

Breaks experimental Range API.
Adds new Interval type and associated support.

This commit adds the following:

- Renamed Range to IntervalRange to avoid name collision with scala Range
- Changed RangeTransform macro to Return an IntervalRange
  - Improved error messages on missing comma or decimal
  - Added notational support for binary point
  - Some formatting cleanup also
- SIntFactory
  - Change to use IntervalRange API
- UIntFactory
  - UInt from range has custom width computation
    - It does not need to deal with lowerbound extending bit requirements
    - Code to handle special case of range"[0,0]" to have a width of 1
- IR.scala
  - Removed Bound and other constraint code that was duplicating firrtl stuff
  - Added new RangeType
  - Added IntervalRange class and object
- RangeSpec
  - modified just a bit to handle notational differences
    - previous range interpolator returned tuple now returns IntervalRange
- Add IntervalType to emitter
- Added IntervalSpec with many tests
- Added ScalaIntervalSimulatorSpec which tests golden model for Interval
- Added ScalaIntervalSimulator which is a golden model for Interval
  - This gold may not have been polished to a high sheen
- Add IntervalLit cases to Converter
- Add Interval PrimOps to IR
  - asInterval, wrap, squz, clip, setp, decp, incp
  - Add IntervalLit class to IR
- Add Interval to MonoConnect
- Add Interval Type to Bits (in experimental package)
  - add conversions to Interval from other types
- Add Interval clone stuff to Data
- Add Literal creation helpers to chisel3 package
  - these may move to experimental if I can figure that out

1 files changed, 2 insertions, 2 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/experimental/package.scala b/chiselFrontend/src/main/scala/chisel3/experimental/package.scala
index 2ce3a1c6..7ade2cb3 100644
--- a/chiselFrontend/src/main/scala/chisel3/experimental/package.scala
+++ b/chiselFrontend/src/main/scala/chisel3/experimental/package.scala
@@ -55,7 +55,6 @@ package object experimental {  // scalastyle:ignore object.name
   val Direction = ActualDirection
 
   implicit class ChiselRange(val sc: StringContext) extends AnyVal {
-    import chisel3.internal.firrtl.NumericBound
 
     import scala.language.experimental.macros
 
@@ -67,7 +66,7 @@ package object experimental {  // scalastyle:ignore object.name
       * UInt(range"[0, \${myInt + 2})")
       * }}}
       */
-    def range(args: Any*): (NumericBound[Int], NumericBound[Int]) = macro chisel3.internal.RangeTransform.apply
+    def range(args: Any*): chisel3.internal.firrtl.IntervalRange = macro chisel3.internal.RangeTransform.apply
   }
 
   class dump extends chisel3.internal.naming.dump  // scalastyle:ignore class.name
@@ -76,6 +75,7 @@ package object experimental {  // scalastyle:ignore object.name
 
   object BundleLiterals {
     implicit class AddBundleLiteralConstructor[T <: Bundle](x: T) {
+      //scalastyle:off method.name
       def Lit(elems: (T => (Data, Data))*): T = {
         x._makeLit(elems: _*)
       }