[Info-vax] Dave Cutler, Prism, DEC, Microsoft, etc.

Bob Koehler koehler at eisner.nospam.encompasserve.org
Tue Dec 1 09:27:05 EST 2009


In article <fdWdnb4rXYpO_onWnZ2dnUVZ_q-dnZ2d at earthlink.com>, "John Reagan" <johnrreagan at earthlink.net> writes:
> 
> On the VAX, the compilers (at least the Pascal compiler and I believe the 
> Fortran compiler where I stole the code from) align targets of branches and 
> routine entry points on longword (or quadword boundaries, I forget which). 
> We pad with NOPs.  It made branches and CALLs *MUCH* faster.

   IIRC, that Fortran compiler came out at about the same time as the VAX 
   6000 series (first NVAX?).  And I was left wondering just how fast my 
   MV II was running though all those NOPs on conditional branches not 
   taken.




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