Craig Topper b2e9684fe4 [RISCV] isel (shl (and X, C2), C) -> (slli (srliw X, C3), C3+C).
where C2 has 32 leading zeros and C3 trailing zeros.

When the shl is used by an add C is 1,2 or 3, we end up matching
(add (shl X, C), Y) first. This leaves an and with a constant that
is harder to materialize.
2022-07-02 01:04:44 -07:00
..
2022-07-01 08:25:24 +09:00