back.rtlil: do not consider unreachable array elements when legalizing.

Otherwise we produce invalid RTLIL.
2020-01-01 15:26:05 +00:00 · 2020-01-01 15:26:05 +00:00 · 476ce15f04
parent 318274d5a0
commit 476ce15f04
1 changed files with 3 additions and 1 deletions
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@ -374,7 +374,9 @@ class _ValueCompiler(xfrm.ValueVisitor):
                elem = value.elems[-1]
            return self.match_shape(elem, *value.shape())
        else:
-            raise LegalizeValue(value.index, range(len(value.elems)), value.src_loc)
+            max_index = 1 << len(value.index)
+            max_elem  = len(value.elems)
+            raise LegalizeValue(value.index, range(min(max_index, max_elem)), value.src_loc)


 class _RHSValueCompiler(_ValueCompiler):