On 1/15/2023 5:54 PM, Ed Jaffe wrote:
The original code loaded R14 as shown and used it later in what's now
the failing CLC:
00E1523C | 58E0 8038 | L R14,X'38'(,R8)
00E15240 | 58F0 5080 | L R15,X'80'(,R5)
Actually, the code is supposed to skip the failing CLC if R14 contains
zeros.
00E1528C | 12EE | LTR R14,R14
00E1528E | 4780 62D0 | BC X'8',X'2D0'(,R6)
By accidentally trashing R14 right after loading it, the programmer a)
causes control to unconditionally drop into an optional code path and b)
with the wrong value in R14.
Fun stuff... :-)
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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