Re: [PATCH] rx: avoid adding setpsw for rx_cmpstrn when len is const

[Jeff Law]

On 2/18/25 11:12 AM, Keith Packard wrote:
We can avoid the setpsw instructions when len is a known constant.
When len is zero, the insn result is zero. When len is non-zero,
the scmpu instructions will set the flags correctly.
Were you able to actually trigger cases where operands[3] is a 
CONST_INT?  Again, it's not entirely clear if that can actually happen 
given the operand predicates on the cmpstrnsi expander.

Jeff