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Add support for Vec literals of empty Vecs #4070

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merged 1 commit into from
May 20, 2024

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Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing its own version of the same concept.

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Type of Improvement

  • Bugfix
  • Internal or build-related (includes code refactoring/cleanup)

Desired Merge Strategy

  • Squash

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Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing
its own version of the same concept.
@jackkoenig jackkoenig added the Bugfix Fixes a bug, will be included in release notes label May 17, 2024
@jackkoenig jackkoenig added this to the 5.x milestone May 17, 2024
@@ -489,7 +489,6 @@ sealed class Vec[T <: Data] private[chisel3] (gen: => T, val length: Int) extend
s"are less than zero or greater or equal to than Vec length"
)
}
cloneSupertype(elementInitializers.map(_._2), s"Vec.Lit(...)")
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This was being used as a check, but it is what was blocking size-0 from working in the Vec(0, ...).Lit use case. Rather, that check is only needed when using the Vec.Lit(...) API (since no element type is given) so I basically moved this check there but also went ahead and used it to figure out the resulting Vec type.

Comment on lines +364 to 370
"Empty bundle literals" should "be supported" in {
val chirrtl = ChiselStage.emitCHIRRTL(new RawModule {
val lit = (new Bundle {}).Lit()
lit.litOption should equal(Some(0))
})
}
}
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I also added this test, but it already worked correctly.

@jackkoenig jackkoenig merged commit 86082b1 into main May 20, 2024
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@jackkoenig jackkoenig deleted the support-empty-vec-literals branch May 20, 2024 17:02
@mergify mergify bot added the Backported This PR has been backported label May 20, 2024
mergify bot pushed a commit that referenced this pull request May 20, 2024
Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing
its own version of the same concept.

(cherry picked from commit 86082b1)

# Conflicts:
#	src/test/scala/chiselTests/BundleLiteralSpec.scala
#	src/test/scala/chiselTests/VecLiteralSpec.scala
mergify bot pushed a commit that referenced this pull request May 20, 2024
Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing
its own version of the same concept.

(cherry picked from commit 86082b1)
chiselbot pushed a commit that referenced this pull request May 20, 2024
Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing
its own version of the same concept.

(cherry picked from commit 86082b1)

Co-authored-by: Jack Koenig <koenig@sifive.com>
chiselbot pushed a commit that referenced this pull request May 20, 2024
* Add support for Vec literals of empty Vecs (#4070)

Also tweak Vec.Lit code to use cloneAsSuperType rather than implementing
its own version of the same concept.

(cherry picked from commit 86082b1)

# Conflicts:
#	src/test/scala/chiselTests/BundleLiteralSpec.scala
#	src/test/scala/chiselTests/VecLiteralSpec.scala

* Resolve backport conflicts

---------

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