On 2015-03-11, at 08:49, John McKown wrote:
And POPCNT is another
one. Why do I need to know the number of 1 bits in each individual
byte in a GPR?
Because CDC had it first? I suspect that it became a built-in
function in Pascal, CARD(), because Pascal was developed on a
CDC which had the
Pages 7 to 8 of this presentation:
https://share.confex.com/share/124/webprogram/Session16609.html
Evidently the code with SIMD instructions is the equivalent of what the
millicode does for SRST, but I may have misinterpreted what was said.
Using the millicoded instruction is evidently less
On 11 March 2015 at 16:41, Paul Gilmartin
0014e0e4a59b-dmarc-requ...@listserv.uga.edu wrote:
On 2015-03-11, at 08:49, John McKown wrote:
And POPCNT is another
one. Why do I need to know the number of 1 bits in each individual
byte in a GPR?
Because CDC had it first? I suspect
When Dan Greiner used to present new hardware instructions at SHARE, he used
to mention some had uses in micro/millicode. He talked about instructions he
had personally pushed for because he could see performance benefits by
using them in millicode. Those of us attending couldn't think
When Dan Greiner used to present new hardware instructions at SHARE, he
used to mention some had uses in micro/millicode. He talked about
instructions he had personally pushed for because he could see
performance benefits by using them in millicode. Those of us attending
couldn't think of
Oops. I dyslex'd the whole thing. Nevermind.
At 3/11/2015 04:06 AM, Binyamin Dissen wrote:
Easy alignment to a 256 byte boundary?
(snip, someone wrote)
And POPCNT is another one. Why do I need to
know the number of 1 bits in each individual byte in a GPR?
On 2015-03-11, at 08:49, John McKown wrote:
Because CDC had it first? I suspect that it became a built-in
function in Pascal, CARD(), because Pascal was
I wonder if anyone knows where to find CE keys for S/360 CPUs.
thanks,
-- glen
From: John McKown john.archie.mck...@gmail.com
Sent: Thursday, March 12, 2015 1:49 AM
Given some of the new instructions, such as LGZR, I wish IBM would
publish a manual with a title like: What were the architects thinking
of? Explanation of the reasons behind the instructions in the z
On 11 March 2015 at 17:33, glen herrmannsfeldt g...@ugcs.caltech.edu wrote:
I wonder if anyone knows where to find CE keys for S/360 CPUs.
I assume you mean a genuine IBM-logo key, rather than a generic Allen key.
The IBM ones show up on eBay from time to time. I bought a similar DEC
one a few
Are you referring to the hex wrench used to open the cabinet doors or the
one used to put the CPU in maintenance mode?
-Original Message-
From: IBM Mainframe Assembler List [mailto:ASSEMBLER-
l...@listserv.uga.edu] On Behalf Of glen herrmannsfeldt
Sent: Wednesday, March 11, 2015 2:33
If you're talking about the CE key that switched metering from
customer to IBM, I have no idea. Those were a real pin-tumbler lock;
not just a simple latch. They may even have been unique to each
machine, though I think it would've been impractical to have each CE
carry a jangling bunch of
Given some of the new instructions, such as LGZR, I wish IBM would
publish a manual with a title like: What were the architects thinking
of? Explanation of the reasons behind the instructions in the z
architecture. Some are obvious, like L, ST, A. But why a single
instruction to do this? Is it
Oops. I dyslex'd the whole thing. Nevermind.
At 3/11/2015 04:06 AM, Binyamin Dissen wrote:
Easy alignment to a 256 byte boundary?
On Tue, 10 Mar 2015 18:57:53 -0400 David Cole dbc...@colesoft.com wrote:
:Per the new PoOps:
:
:
:LZRG R1,D2(X2,B2) [RXY-a]
:
:The second operand, with the
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