1$NetBSD: NOTES,v 1.2 2009/10/29 00:56:19 christos Exp $ 2 3Berkeley Yacc reflects its origins. The reason so many routines 4use exactly six register variables is that Berkeley Yacc was 5developed on a VAX using PCC. PCC placed at most six variables 6in registers. I went to considerable effort to find which six 7variables most belonged in registers. Changes in machines and 8compilers make that effort worthless, perhaps even harmful. 9 10[Given the previous paragraph, and the fact that GCC does not respect 11 register declarations, and the fact that much of the rest of the 12 4.4lite2 release had "register" declarations extirpated, I've removed 13 most of the register declarations from the code. I left them in the 14 generated skeleton code "for the hell of it" but they probably should 15 go from there, too. -- pm, July 1997] 16 17[I totally removed the register stuff; we've deprecated it elsewhere 18 in the tree now -- lukem, October 1997] 19 20The code contains many instances where address calculations are 21performed in particular ways to optimize the code for the VAX. 22