On Wed, Mar 11, 2015 at 10:49 AM, John McKown john.archie.mck...@gmail.com
wrote:
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 Wed, Mar 11, 2015 at 9:58 AM, Mike Shaw quick...@gmail.com wrote:
On Wed, Mar 11, 2015 at 10:49 AM, John McKown john.archie.mck...@gmail.com
wrote:
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?
Tom Ross didn't explain it, but did say the compiler developer was quite
enthusiastic about it.
So we have to write a COBOL program, get the new compiler to generate
the code, get a z13 and run z/XDC to see what the instruction actually does!
Not too likely this week, I suppose.
Gary Weinhold
Here are pictures of the key switch:
https://commons.wikimedia.org/wiki/File:Customer_Engineer_Key_Switch_for_IBM_S-360_computer,_view_1.JPG
https://commons.wikimedia.org/wiki/File:Customer_Engineer_Key_Switch_for_IBM_S-360_computer,_view_2.JPG
On Mar 12, 2015, at 18:31, Gary Weinhold weinh...@dkl.com wrote:
Tom Ross didn't explain it, but did say the compiler developer was quite
enthusiastic about it.
So we have to write a COBOL program, get the new compiler to generate
the code, get a z13 and run z/XDC to see what the
On Wed, 11 Mar 2015 16:31:18 -0700, glen herrmannsfeldt wrote:
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;
Yes, that one.
Also, I don't know if it would match the blank that ordinary
locksmiths would sell.
I don't have any real understanding of this, but this is interesting:Every
serious hacker sooner or later needs the popcount instruction.
This population count instruction counts the set bits in a register, and is
so useful that the NSA demands that all computers they purchase implement it in
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
