Added blurb about register variables

git-svn-id: svn://svn.cc65.org/cc65/trunk@1654 b7a2c559-68d2-44c3-8de9-860c34a00d81
2026-04-26 13:18:31 +00:00 · 2002-11-26 18:46:40 +00:00
parent 0348739164
commit 6598be68b2
3 changed files with 102 additions and 24 deletions
@@ -312,6 +312,10 @@ As a general rule: Use register variables only for pointers that are
 dereferenced several times in your function, or for heavily used induction
 variables in a loop (with several 100 accesses).

+When declaring register variables, try to keep them together, because this
+will allow the compiler to save and restore the old values in one chunk, and
+not in several.
+
 And remember: Register variables must be enabled with <tt/-r/ or <tt/-Or/.