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8.23.1 Options

The PDP-11 version of as has a rich set of machine dependent options.

8.23.1.1 Code Generation Options
-mpic | -mno-pic
Generate position-independent (or position-dependent) code.

The default is to generate position-independent code.

8.23.1.2 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.


-mfis | -mkev11
-mno-fis | -mno-kev11
Enable (or disable) the use of the KEV11 floating-point instructions: FADD, FDIV, FMUL, and FSUB.


-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, and TSTF.


-mlimited-eis | -mno-limited-eis
Enable (or disable) the use of the limited extended instruction set: MARK, RTT, SOB, SXT, and XOR.

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 and WRTLCK.


-mmxps | -mno-mxps
Enable (or disable) the use of the MFPS and MTPS instructions.


-mspl | -mno-spl
Enable (or disable) the use of the SPL instruction.

Enable (or disable) the use of the microcode instructions: LDUB, MED, and XFC.

8.23.1.3 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, and MTPS.


-mkd11f | -mkd11h | -mkd11q
KD11-F, KD11-H, or KD11-Q CPU. Enable limited extended instruction set, MFPS, and MTPS.


-mkd11k
KD11-K CPU. Enable extended instruction set, LDUB, MED, MFPS, MFPT, MTPS, and XFC.


-mkd11z
KD11-Z CPU. Enable extended instruction set, CSM, MFPS, MFPT, MTPS, and SPL.


-mf11
F11 CPU. Enable extended instruction set, MFPS, MFPT, and MTPS.


-mj11
J11 CPU. Enable extended instruction set, CSM, MFPS, MFPT, MTPS, SPL, TSTSET, and WRTLCK.


-mt11
T11 CPU. Enable limited extended instruction set, MFPS, and MTPS.
8.23.1.4 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.