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back.pysim: fix RHS codegen for Cat() and Repl(..., 0).

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Fixes #325.
This commit is contained in:
whitequark 2020-02-19 01:21:00 +00:00
parent 377f2d987d
commit ec7aee62ea
2 changed files with 18 additions and 2 deletions
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8
nmigen/back/pysim.py
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@ -492,7 +492,9 @@ class _RHSValueCompiler(_ValueCompiler):
part_mask = (1 << len(part)) - 1
gen_parts.append(f"(({self(part)} & {part_mask}) << {offset})")
offset += len(part)
return f"({' | '.join(gen_parts)})"
if gen_parts:
return f"({' | '.join(gen_parts)})"
return f"0"
def on_Repl(self, value):
part_mask = (1 << len(value.value)) - 1
@ -502,7 +504,9 @@ class _RHSValueCompiler(_ValueCompiler):
for _ in range(value.count):
gen_parts.append(f"({gen_part} << {offset})")
offset += len(value.value)
return f"({' | '.join(gen_parts)})"
if gen_parts:
return f"({' | '.join(gen_parts)})"
return f"0"
def on_ArrayProxy(self, value):
index_mask = (1 << len(value.index)) - 1