10-30-2011
[ASM] Adding SIGNED numbers?
Hi guys, I want to add a list of SIGNED numbers... but I don't know how to tell the computer to ADD THEM as signed, let me explain further:
when adding 200 + (-100) , it becomes 100, but in asm the computer always add them as unsigned, so I always get the 300. Do I have to add them in a register, and do the two's complement ?
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machid(1) General Commands Manual machid(1)
NAME
machid: hp9000s200, hp9000s300, hp9000s400, hp9000s500, hp9000s700, hp9000s800, hp-mc680x0, hp-pa, pdp11, u370, u3b, u3b10, u3b2, u3b5, vax
- provide truth value about processor type
SYNOPSIS
DESCRIPTION
The following commands return a true value (exit code 0) if the a processor type matches the command name. Otherwise a false value (exit
code nonzero) is returned. These commands are commonly used within makefiles and shell procedures to improve portability of applications
(see make(1)).
+-----------+-------------------------++--------+--------------------------+
|Command | True for ||Command | True for |
+-----------+-------------------------++--------+--------------------------+
|hp9000s200 | Series 200 ||pdp11 | PDP-11/45 or PDP-11/70 |
|hp9000s300 | Series 300 ||u3b | 3B20 computer |
|hp9000s400 | Series 400 ||u3b2 | 3B2 computer |
|hp9000s500 | Series 500 ||u3b5 | 3B5 computer |
|hp9000s700 | Series 700 ||u3b10 | 3B10 computer |
|hp9000s800 | Series 800 or 700 ||u370 | IBM System/370 computer |
|hp-mc680x0 | Series 200, 300, or 400 ||vax | VAX-11/750 or VAX-11/780 |
|hp-pa | Series 700 or 800 || | |
+-----------+-------------------------++--------+--------------------------+
EXAMPLES
Given a shell script that must behave differently when run on an HP 9000 Series 700 or 800 system, select the correct code segment to be
executed:
WARNINGS
always returns true on both Series 800 and Series 700 systems. Therefore, when using this command in scripts to determine hardware type,
always use both and in the appropriate sequence to ensure correct results (see
machid(1) will no longer provide support for future machines beyond the Series 800 and Series 700 systems. Decisions should be based on
the hardware and software configuration information returned by getconf(1).
SEE ALSO
getconf(1), make(1), sh(1), test(1), true(1).
machid(1)