Chapter 32.
PDP 11 Dependent Features
32.1. Options
The PDP 11 version of
as
has a rich set of machine dependent options.
32.1.1. Code Generation Options
 mpic |  mno pic
Generate position independent (or position dependent) code.
The default is to generate position independent code.
32.1.2. Instruction Set Extension Options
These options enables or disables the use of extensions over the base line instruction set as introduced
by the first PDP 11 CPU: the KA11. Most options come in two variants: a
 mextension
that enables
extension
, and a
 mno extension
that disables
extension
.
The default is to enable all extensions.
 mall |  mall extensions
Enable all instruction set extensions.
 mno extensions
Disable all instruction set extensions.
 mcis |  mno cis
Enable (or disable) the use of the commercial instruction set, which consists of these
instructions:
ADDNI
,
ADDN
,
ADDPI
,
ADDP
,
ASHNI
,
ASHN
,
ASHPI
,
ASHP
,
CMPCI
,
CMPC
,
CMPNI
,
CMPN
,
CMPPI
,
CMPP
,
CVTLNI
,
CVTLN
,
CVTLPI
,
CVTLP
,
CVTNLI
,
CVTNL
,
CVTNPI
,
CVTNP
,
CVTPLI
,
CVTPL
,
CVTPNI
,
CVTPN
,
DIVPI
,
DIVP
,
L2DR
,
L3DR
,
LOCCI
,
LOCC
,
MATCI
,
MATC
,
MOVCI
,
MOVC
,
MOVRCI
,
MOVRC
,
MOVTCI
,
MOVTC
,
MULPI
,
MULP
,
SCANCI
,
SCANC
,
SKPCI
,
SKPC
,
SPANCI
,
SPANC
,
SUBNI
,
SUBN
,
SUBPI
, and
SUBP
.
 mcsm |  mno csm
Enable (or disable) the use of the
CSM
instruction.
 meis |  mno eis
Enable (or disable) the use of the extended instruction set, which consists of these instructions:
ASHC
,
ASH
,
DIV
,
MARK
,
MUL
,
RTT
,
SOB SXT
, and
XOR
.






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