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Diffstat (limited to 'usr.bin/yacc/NOTES')
| -rw-r--r-- | usr.bin/yacc/NOTES | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/usr.bin/yacc/NOTES b/usr.bin/yacc/NOTES deleted file mode 100644 index 9db3c96..0000000 --- a/usr.bin/yacc/NOTES +++ /dev/null @@ -1,9 +0,0 @@ -Berkeley Yacc reflects its origins. The reason so many routines -use exactly six register variables is that Berkeley Yacc was -developed on a VAX using PCC. PCC placed at most six variables -in registers. I went to considerable effort to find which six -variables most belonged in registers. Changes in machines and -compilers make that effort worthless, perhaps even harmful. - -The code contains many instances where address calculations are -performed in particular ways to optimize the code for the VAX. |
