Threaded Mode | Linear Mode

toml_12953 · (This post was last modified: 09-26-2024 10:23 AM by toml_12953.)

In the following Nqueens benchmark, why is DEG used after the ISG and DSE statements? There are no trig functions in the program. If they're supposed to be NOPs, why not just use a register increment or decrement? I'm confused.

Code:

LBL "NQUEENS"

        TIME

        STO "T0"

LBL A   CLRG

        8 STO 11

LBL 00  RCL 00 RCL 11

        X=Y? GTO 04

        ISG 00 DEG

        STO IND 00

LBL 01  ISG 10 DEG

        RCL 00 STO 09

LBL 02  DSE 09 DEG

        RCL 09 X=0? GTO 00

        RCL IND 00 RCL IND 09 -

        X=0? GTO 03

        ABS RCL 00 RCL 09 -

        X<>Y? GTO 02

LBL 03  DSE IND 00 GTO 01

        DSE 00 GTO 03

LBL 04  RCL 10

        TIME

        RCL "T0"

        HMS-

        →HR

        3600

        ×

        RTN