Haocong.Lu bd653f6406 [RISCV] Use shift for zero extension when Zbb and Zbp are not enabled ...

Now AND is used for zero extension when both Zbb and Zbp are not enabled.
It may be better to use shift operation if the trailing ones mask exceeds simm12.

This patch optimzes LUI+ADDI+AND to SLLI+SRLI.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D116720

2022-01-11 02:37:03 +00:00

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