Nikita Popov ad9dad93ff [BasicAA] Bail out earlier for invalid shift amount ...

Currently, we'd produce an incorrect decomposition, because we
already recursively called GetLinearExpression(), so the Scale=1,
Offset=0 will not necessarily be relative to the shl itself.

Now, this doesn't actually matter for functional correctness,
because such a shift is poison anyway, so its okay to return
an incorrect decomposition. It's still unnecessarily confusing
though, and we can easily avoid this by checking the bitwidth
earlier.

2021-03-27 12:41:16 +01:00

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