* add mill build
* add gitignore and mill version

Co-authored-by: Schuyler Eldridge <schuyler.eldridge@gmail.com>

Close #1134

Co-authored-by: Megan Wachs <megan@sifive.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Emit FIRRTL andr, orr for Bits.{andR, orR}

Change the emission strategy for Bits methods andR and orR to emit
FIRRTL bitwise reduce operations andr and orr.

Add two tests that assert the correct behavior of these operations in
BitwiseOpsSpec.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

Adds additional Scaldoc to the RegNext object that (1) indicates that
the width is not set and (2) shows an example of how to construct a
RegNext-like construct with a set width.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

* Add support for readUnderWrite to SyncReadMem

* Add write collision behavior test to MemorySpec

* Update constant names

Add method asBool to Clock.

Co-authored-by: Jim Lawson <ucbjrl@berkeley.edu>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* Remove redundancy code

* Remove blank line

* BitPat supports whitespace and underscores, presumably for human readability.
The BitPat.parse factory though did not remove these from the returned count.
This fixes that adds whitespace and underscores to the unit tests
This is an updated vesion of Chisel PR #1069

Co-authored-by: Chick Markley <chick@qrhino.com>
Co-authored-by: Jim Lawson <ucbjrl@berkeley.edu>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Provides Double and BigDecimal methods to  access literal values for FixedPoint and Interval

Co-authored-by: Chick Markley <chick@qrhino.com>

* Change when thunks return type to Any

Changes the type of the thunk for when and WhenContext methods from
call-by-name Unit to call-by-name Any. This prevents a
warning (-Ywarn-value-discard) where a when thunk is returning
something other than Unit that is then discarded, e.g., another
WhenContext.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

* Change switch thunk return to type to Any

Changes the type of switch thunks from call-by-name Unit to
call-by-name Any. This prevents a warning (-Ywarn-value-discard) when
the internals of a switch block return something other than Unit which
is then discarded.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

# Conflicts:
#	src/test/scala/chiselTests/IntervalSpec.scala

BitPat supports whitespace and underscores

Non-functional, must have been a typo