8.24.1 Options
The PDP-11 version of as
has a rich set of machine dependent options.
8.24.1.1 Code Generation Options
-
-mpic | -mno-pic
-
Generate position-independent (or position-dependent) code.
The default is to generate position-independent code.
8.24.1.2 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 -m
extension 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
, andSUBP
. -
-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
, andXOR
. -
-mfis | -mkev11
-
-mno-fis | -mno-kev11
-
Enable (or disable) the use of the KEV11 floating-point instructions:
FADD
,FDIV
,FMUL
, andFSUB
. -
-mfpp | -mfpu | -mfp-11
-
-mno-fpp | -mno-fpu | -mno-fp-11
-
Enable (or disable) the use of FP-11 floating-point instructions:
ABSF
,ADDF
,CFCC
,CLRF
,CMPF
,DIVF
,LDCFF
,LDCIF
,LDEXP
,LDF
,LDFPS
,MODF
,MULF
,NEGF
,SETD
,SETF
,SETI
,SETL
,STCFF
,STCFI
,STEXP
,STF
,STFPS
,STST
,SUBF
, andTSTF
. -
-mlimited-eis | -mno-limited-eis
-
Enable (or disable) the use of the limited extended instruction set:
MARK
,RTT
,SOB
,SXT
, andXOR
.The -mno-limited-eis options also implies -mno-eis.
-
-mmfpt | -mno-mfpt
-
Enable (or disable) the use of the
MFPT
instruction. -
-mmultiproc | -mno-multiproc
-
Enable (or disable) the use of multiprocessor instructions:
TSTSET
andWRTLCK
. -
-mmxps | -mno-mxps
-
Enable (or disable) the use of the
MFPS
andMTPS
instructions. -
-mspl | -mno-spl
-
Enable (or disable) the use of the
SPL
instruction.Enable (or disable) the use of the microcode instructions:
LDUB
,MED
, andXFC
.
8.24.1.3 CPU Model Options
These options enable the instruction set extensions supported by a particular CPU, and disables all other extensions.
-
-mka11
- KA11 CPU. Base line instruction set only.
-
-mkb11
-
KB11 CPU. Enable extended instruction set and
SPL
. -
-mkd11a
- KD11-A CPU. Enable limited extended instruction set.
-
-mkd11b
- KD11-B CPU. Base line instruction set only.
-
-mkd11d
- KD11-D CPU. Base line instruction set only.
-
-mkd11e
-
KD11-E CPU. Enable extended instruction set,
MFPS
, andMTPS
. -
-mkd11f | -mkd11h | -mkd11q
-
KD11-F, KD11-H, or KD11-Q CPU. Enable limited extended instruction set,
MFPS
, andMTPS
. -
-mkd11k
-
KD11-K CPU. Enable extended instruction set,
LDUB
,MED
,MFPS
,MFPT
,MTPS
, andXFC
. -
-mkd11z
-
KD11-Z CPU. Enable extended instruction set,
CSM
,MFPS
,MFPT
,MTPS
, andSPL
. -
-mf11
-
F11 CPU. Enable extended instruction set,
MFPS
,MFPT
, andMTPS
. -
-mj11
-
J11 CPU. Enable extended instruction set,
CSM
,MFPS
,MFPT
,MTPS
,SPL
,TSTSET
, andWRTLCK
. -
-mt11
- T11 CPU. Enable limited extended instruction set,
MFPS
, andMTPS
.
8.24.1.4 Machine Model Options
These options enable the instruction set extensions supported by a particular machine model, and disables all other extensions.
-
-m11/03
-
Same as
-mkd11f
. -
-m11/04
-
Same as
-mkd11d
. -
-m11/05 | -m11/10
-
Same as
-mkd11b
. -
-m11/15 | -m11/20
-
Same as
-mka11
. -
-m11/21
-
Same as
-mt11
. -
-m11/23 | -m11/24
-
Same as
-mf11
. -
-m11/34
-
Same as
-mkd11e
. -
-m11/34a
-
Ame as
-mkd11e
-mfpp
. -
-m11/35 | -m11/40
-
Same as
-mkd11a
. -
-m11/44
-
Same as
-mkd11z
. -
-m11/45 | -m11/50 | -m11/55 | -m11/70
-
Same as
-mkb11
. -
-m11/53 | -m11/73 | -m11/83 | -m11/84 | -m11/93 | -m11/94
-
Same as
-mj11
. -
-m11/60
- Same as
-mkd11k
.