9.26.1 Options

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

9.26.1.1 Code Generation Options

-mpic | -mno-pic

Generate position-independent (or position-dependent) code.

The default is to generate position-independent code.

9.26.1.2 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.

9.26.1.3 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.

9.26.1.4 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.