Paul Gilmartin wrote:
On Sat, 12 Sep 2020 07:35:00 -0400, Thomas David Rivers wrote:
ADD UNSIGNED doesn't trigger the FIXED OVERFLOW exception, while
SIGNED operations do. Since C doesn't want FIXED OVERFLOW exceptions,
(almost) all of the arithmetic calculations should be done with unsigne
On Sat, 12 Sep 2020 07:35:00 -0400, Thomas David Rivers wrote:
>
> ADD UNSIGNED doesn't trigger the FIXED OVERFLOW exception, while
> SIGNED operations do. Since C doesn't want FIXED OVERFLOW exceptions,
> (almost) all of the arithmetic calculations should be done with unsigned
> arithmetic in ca
On Fri, Sep 11, 2020 at 10:56:00PM -0300, Clark Morris wrote:
> [Default] On Wed, 09 Sep 2020 20:35:48 -0400, in bit.listserv.ibm-main
> Thomas David Rivers wrote:
>
> >> snip
> The way I read the code it is adding unsigned integers since only ADD
> LOGICAL instructions are used. Handling number
Paul Gilmartin wrote:
On Thu, 10 Sep 2020 15:35:37 +, Seymour J Metz wrote:
Yes, you can always do multiple precision that way, but there is a performance
hit, especially from those conditional branches. Maybe we need skip
instructions such as the 7090 had.
Some computer archit
On Thu, 10 Sep 2020 15:35:37 +, Seymour J Metz wrote:
>Yes, you can always do multiple precision that way, but there is a performance
>hit, especially from those conditional branches. Maybe we need skip
>instructions such as the 7090 had.
Some computer architectures have an Add-With-Carry i
Mainframe Discussion List on behalf of
Thomas David Rivers
Sent: Wednesday, September 9, 2020 8:35 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Support for 128-bit arithmetic - was: Re: PL/I support of vector
instructions?
Seymour J Metz wrote:
>I was asking whether it supported vector instructi
Seymour J Metz wrote:
I was asking whether it supported vector instructions for FIXED, not for
FLOAT.; in particular, whether it supported FIXED BIN(127,0).
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
You would not need vector instructions to support FIXED BIN(127,s)
(quad-w
