[parisc-linux] 64 byte alignment

[Will Newton]

I'm trying to 64 byte align a stack pointer, unfortunately it's not working. 
Here is my code:

        ldi 0x03f,%r21                  ; Load mask (b0111111)
        and,<> %r3,%r21,%r21            ; Check alignment
        addi 64,%r3,%r3                 ; If not aligned round up
        depwi 0x0,31,6,%r3               ; Clear low order bits

Basically the idea is:
 and the low 6 bits with a mask to see if any are set.
 if any are set, add 64 and clear the low order bits

I may be doing something horribly ignorant here, but PA-RISC assembly is not 
the most widely documented of things. :)

Thanks,