Craig Topper 8e4909aa19 [RISCV] Remove unnecessary vand.vi from vXi1 and nvXvi1 VECTOR_REVERSE codegen. (#109071) ...

Use a setne with 0 instead of a trunc. We know we zero extended the node
so we can get by with a non-zero check only. The truncate lowering
doesn't know that we zero extended so has to mask the lsb.

I don't think DAG combine sees the trunc before we lower it to RISCVISD
nodes so we don't get a chance to use computeKnownBits to remove the
AND.

2024-09-18 09:43:48 -07:00

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