On 2022-04-22 02:08, Paul Gilmartin wrote:
On Apr 21, 2022, at 10:00:19, Gord Tomlin
<[email protected]> wrote:
On 2022-04-21 10:46 AM, Seymour J Metz wrote:
Well, in the case of S/370 the compiler could emit JO or JNO after
the add.
Well, if only JO and JNO had existed in the days of S/370...
Wasn't there BC, even before the 370?
Of course; the S/360 instruction set contained a conditional branch
instruction that tested the condition code.
This is the BC instruction, and it has been carried through to
current hardware.
Yes, it required a base register, but weren't programmers in
that era pretty much resigned to base registers?
Base registers were the primary way you could get around in S/370.
