A blast from the past

[Richard Kenner]

    Thu Apr  4 07:34:17 1991  Richard Kenner  (kenner at vlsi1.ultra.nyu.edu)

Wow!  That's over a decade ago.

    What I'm trying to figure out is why you didn't try to remove any SUBREGs
    for op1 in a manner similar to how you try to remove them for op0.

Obviously I can't remember for sure, but my *guess* is that I felt
canonicalization would move the SUBREG operand to OP0.  Unless that's wrong,
I think the only way OP1 could be a SUBREG is if both it and OP0 were.
I don't know why this code didn't try to handle that case.

Sorry, it's just too long ago to know more.