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, 4 insertions, 9 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/SIntFactory.scala b/chiselFrontend/src/main/scala/chisel3/SIntFactory.scala
index 607e2e35..c1c6b1db 100644
--- a/chiselFrontend/src/main/scala/chisel3/SIntFactory.scala
+++ b/chiselFrontend/src/main/scala/chisel3/SIntFactory.scala
@@ -2,9 +2,7 @@
 
 package chisel3
 
-import chisel3.internal.firrtl.{KnownSIntRange, NumericBound, Range, SLit, Width}
-
-// scalastyle:off method.name
+import chisel3.internal.firrtl.{IntervalRange, SLit, Width}
 
 trait SIntFactory {
   /** Create an SInt type with inferred width. */
@@ -13,15 +11,12 @@ trait SIntFactory {
   def apply(width: Width): SInt = new SInt(width)
 
   /** Create a SInt with the specified range */
-  def apply(range: Range): SInt = {
+  def apply(range: IntervalRange): SInt = {
     apply(range.getWidth)
   }
-  /** Create a SInt with the specified range */
-  def apply(range: (NumericBound[Int], NumericBound[Int])): SInt = {
-    apply(KnownSIntRange(range._1, range._2))
-  }
 
-   /** Create an SInt literal with specified width. */
+  /** Create an SInt literal with specified width. */
+  // scalastyle:off method.name
   protected[chisel3] def Lit(value: BigInt, width: Width): SInt = {
     val lit = SLit(value, width)
     val result = new SInt(lit.width)