Re: [PATCH 0/2] Add optimized powerpc64 assembly for SHA2

Eric Richter erichte@linux.ibm.com writes:

Thanks for the suggestion! I moved the "% 16" into that eval to clean up those load calls.

After a bit of fiddling with m4 though, it appears that this emits something like "v16" without applying the translation of v16 -> 16, causing the assembler to choke. I did manage to get it to work with a naive concatenation macro like this:

define(`CONCAT', `$1$2') define(`IV', `CONCAT(v, eval((($1) % 16) + 16))')

though I feel like there is a more elegant and clear solution.

I think m4_unquote (defined and briefly documented in m4-utils.m4) might solve this problem. Not tested, but something like

define(`IV', `m4_unquote(v`'eval((($1) % 16) + 16))')

Regards, /Niels