Ed Jaffe wrote on 1/27/22 5:06 PM:
On 1/27/2022 11:20 AM, Tony Thigpen wrote:
The question has nothing to do with "what if +4 is zeros." It is "what
if +4 has one of the standard literals."
I gotta ask...
From a purely practical standpoint, would you or anyone really want to
maintain bifurcated code that took different save/restore code paths
based upon the value discovered at 4(R13)?
Maybe.
I have a lot of small reenterable routines where I need to start saving
the high-halves. I can see where I can optimize them using 64bit
instructions. They don't call anybody else, so they don't currently set
up new save areas. I am looking at the CPU savings of only obtaining the
storage for a new save area for the high-halfs when I actually need it
(because I don't know what the caller provided).
Part of my questions are simply to better understand this subject. And,
by some of the other posts, this is a subject were there is much confusion.
Tony Thigpen
--
Phoenix Software International
Edward E. Jaffe
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El Segundo, CA 90245
https://www.phoenixsoftware.com/
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