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back.rtlil: don't crash legalizing values with no branches.

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Fixes #239.
This commit is contained in:
whitequark 2019-10-06 08:52:49 +00:00
parent 964c67453f
commit 2512a9a12d
1 changed files with 2 additions and 1 deletions
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3
nmigen/back/rtlil.py
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@ -731,7 +731,8 @@ class _StatementCompiler(xfrm.StatementVisitor):
src=src(legalize.src_loc)) as switch:
width, signed = legalize.value.shape()
tests = ["{:0{}b}".format(v, width) for v in legalize.branches]
tests[-1] = "-" * width
if tests:
tests[-1] = "-" * width
for branch, test in zip(legalize.branches, tests):
with self.case(switch, (test,)):
self._wrap_assign = False