Add Support for FPGA Bitstream Preset-registers (#1050)

Introduce Preset Register Specialized Emission
- Introduce EmissionOption trait
- Introduce PresetAnnotation & PresetRegAnnotation
- Enable the collection of Annotations in the Emitter
- Introduce collection mechanism for EmissionOptions in the Emitter
- Add PropagatePresetAnnotation transform to annotate register for emission and clean-up the useless reset tree (no DCE involved)
- Add corresponding tests spec and tester

Co-authored-by: Jack Koenig <koenig@sifive.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/test/scala/firrtlTests/LoweringCompilersSpec.scala b/src/test/scala/firrtlTests/LoweringCompilersSpec.scala
index f3183599..dcc4e48d 100644
--- a/src/test/scala/firrtlTests/LoweringCompilersSpec.scala
+++ b/src/test/scala/firrtlTests/LoweringCompilersSpec.scala
@@ -203,6 +203,7 @@ class LoweringCompilersSpec extends FlatSpec with Matchers {
       new firrtl.transforms.FixAddingNegativeLiterals,
       new firrtl.transforms.ReplaceTruncatingArithmetic,
       new firrtl.transforms.InlineBitExtractionsTransform,
+      new firrtl.transforms.PropagatePresetAnnotations,
       new firrtl.transforms.InlineCastsTransform,
       new firrtl.transforms.LegalizeClocksTransform,
       new firrtl.transforms.FlattenRegUpdate,
@@ -222,6 +223,7 @@ class LoweringCompilersSpec extends FlatSpec with Matchers {
       new firrtl.transforms.FixAddingNegativeLiterals,
       new firrtl.transforms.ReplaceTruncatingArithmetic,
       new firrtl.transforms.InlineBitExtractionsTransform,
+      new firrtl.transforms.PropagatePresetAnnotations,
       new firrtl.transforms.InlineCastsTransform,
       new firrtl.transforms.LegalizeClocksTransform,
       new firrtl.transforms.FlattenRegUpdate,