In <p06240800ca3eb2ceae91@[192.168.1.11]>, on 07/09/2011
at 10:04 PM, "Robert A. Rosenberg" <hal9...@panix.com> said:
>If the macro takes it upon itself to issue a USING on one of the 4
>linkage registers [instead of just using the usual
>Value-DSECT(Register) displacement addressing] it should clean up
>after itself by using PUSH/POP
I would consider that harmful. If you want consistency, then any macro
altering a register should issue a DROP.
>or at least document that it will destroy not only the pre-call
>Register Contents (as it is allowed to do due to the designation
>of R14-R1 as Linkage Registers) but any pre-call USINGs that
>were in effect.
There we almost agree; I would be satisfied with a generic statement
that any macro altering a register might also issue a DROP.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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