re: port-sparc/57594: openssl speed crashes on sparcv8

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR port-sparc/57594; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-sparc-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost, martin%NetBSD.org@localhost
Subject: re: port-sparc/57594: openssl speed crashes on sparcv8
Date: Thu, 31 Aug 2023 05:47:13 +1000

 martin and i figured out what is going on here.
 
 basically, the rd on sparc ends up reading from th %y register,
 and if it just happens to have 0x99 value already, then the
 test for v9 will false-positively pass and we fault.
 
 must be something in newer openssl that ends up leaving %y with
 0x99 and wasn't hit before, as this bug is old.
 
 
 .mrg.