[Info-vax] Listeners in VMS Basic, was: Re: Integrity iLO Configuration?

[abrsvc]

On Monday, July 12, 2021 at 12:28:37 PM UTC-4, Arne Vajhøj wrote:
> On 7/12/2021 12:17 PM, abrsvc wrote: 
> > On Monday, July 12, 2021 at 11:02:35 AM UTC-4, Arne Vajhøj wrote: 
> >> On 7/12/2021 1:34 AM, Simon Clubley wrote: 
> >>> On 2021-07-10, abrsvc <dansabr... at yahoo.com> wrote: 
> >>>>> But I wonder why MOVZWL and not just MOVL! 
> >>>> 
> >>>> IRRC, the MOVZWL will take less memory since the immediate value will be smaller. 
> >>> 
> >>> It would be amusing if the more efficient sequences get translated 
> >>> to less efficient sequences on Alpha and above when using the Macro-32 
> >>> compiler and if a less efficient sequence on VAX actually translates 
> >>> to a more efficient sequence on Alpha and above. :-) 
> >> On Alpha both end up as: 
> >> 
> >> MOV 1, R0 
> >
> > There is no "mov" on Alpha. What you will end up with is a load/store combination.
> .title z 
> .psect $CODE quad,pic,con,lcl,shr,exe,nowrt 
> .entry z1,^m<r2,r3,r4,r5> 
> movl #1,r0 
> ret 
> .entry z2,^m<r2,r3,r4,r5> 
> movzwl #1,r0 
> ret 
> .end 
> 
> gave me: 
> 
> .PSECT $CODE, QUAD, PIC, CON, REL, 
> LCL, SHR, EXE, RD, NOWRT 
> 0000 Z1:: 
> 23DEFFC0 0000 LDA SP, -64(SP) 
> B77E0000 0004 STQ R27, (SP) 
> B75E0010 0008 STQ R26, 16(SP) 
> B45E0018 000C STQ R2, 24(SP) 
> B47E0020 0010 STQ R3, 32(SP) 
> B49E0028 0014 STQ R4, 40(SP) 
> B4BE0030 0018 STQ R5, 48(SP) 
> B7BE0038 001C STQ FP, 56(SP) 
> 47FE041D 0020 MOV SP, FP 
> 0024 $L1: 
> 47E03400 0024 MOV 1, R0 
> ; 000004 
> 0028 $L2: 
> ; 000005 
> 47FD041E 0028 MOV FP, SP 
> A79D0010 002C LDQ R28, 16(FP) 
> A45D0018 0030 LDQ R2, 24(FP) 
> A47D0020 0034 LDQ R3, 32(FP) 
> A49D0028 0038 LDQ R4, 40(FP) 
> A4BD0030 003C LDQ R5, 48(FP) 
> A7BD0038 0040 LDQ FP, 56(FP) 
> 23DE0040 0044 LDA SP, 64(SP) 
> 6BFC8001 0048 RET R28 
> 2FFE0000 004C UNOP 
> 
> Routine Size: 80 bytes, Routine Base: $CODE + 0000 
> 
> 0050 Z2:: 
> 23DEFFC0 0050 LDA SP, -64(SP) 
> B77E0000 0054 STQ R27, (SP) 
> B75E0010 0058 STQ R26, 16(SP) 
> B45E0018 005C STQ R2, 24(SP) 
> B47E0020 0060 STQ R3, 32(SP) 
> B49E0028 0064 STQ R4, 40(SP) 
> B4BE0030 0068 STQ R5, 48(SP) 
> B7BE0038 006C STQ FP, 56(SP) 
> 47FE041D 0070 MOV SP, FP 
> 0074 $L3: 
> 47E03400 0074 MOV 1, R0 
> ; 000007 
> 0078 $L4: 
> ; 000008 
> 47FD041E 0078 MOV FP, SP 
> A79D0010 007C LDQ R28, 16(FP) 
> A45D0018 0080 LDQ R2, 24(FP) 
> A47D0020 0084 LDQ R3, 32(FP) 
> A49D0028 0088 LDQ R4, 40(FP) 
> A4BD0030 008C LDQ R5, 48(FP) 
> A7BD0038 0090 LDQ FP, 56(FP) 
> 23DE0040 0094 LDA SP, 64(SP) 
> 6BFC8001 0098 RET R28 
> 
> Arne

I stand corrected, but not in the way you think.  The MOV FP,SP is actually a BIS FP,FP,SP instruction.
While I can't recall what the Immediate sequence would be for MOV 1,RO, it too would be another instruction.
The MOV is for the human reader and is a pseudo instruction.

Dan