tree bfe2ade8bebf129646374337d38db3beebb29421
parent 41f0574c4654fb8a8cbb8c26d453f51a31cfd2a0
author Philip Reames <preames@rivosinc.com> 1715272086 -0700
committer Philip Reames <listmail@philipreames.com> 1715273543 -0700

[RISCV] Add coverage for zext.w/h interaction with shift transforms

Two cases where folding the and (which could be a zext.w) through
shifts in generic DAG result in net worse code quality.  And one
negative case where keeping a zext.h would result in a longer
critical path.