Module Name: src
Committed By: simonb
Date: Tue Sep 29 00:13:13 UTC 2020
Modified Files:
src/sys/lib/libsa: twiddle.c
Log Message:
Add a slow twiddle option. This speeds up a pmax netboot by 15% and
is only 1% slower than no twiddle.
To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/lib/libsa/twiddle.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/lib/libsa/twiddle.c
diff -u src/sys/lib/libsa/twiddle.c:1.8 src/sys/lib/libsa/twiddle.c:1.9
--- src/sys/lib/libsa/twiddle.c:1.8 Wed Apr 30 16:18:09 2008
+++ src/sys/lib/libsa/twiddle.c Tue Sep 29 00:13:12 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: twiddle.c,v 1.8 2008/04/30 16:18:09 ad Exp $ */
+/* $NetBSD: twiddle.c,v 1.9 2020/09/29 00:13:12 simonb Exp $ */
/*-
* Copyright (c) 1993
@@ -40,13 +40,24 @@
char twiddle_toggle;
+#ifdef LIBSA_SLOW_TWIDDLE
+#define TWIDDLE_DELAY 4
+#else
+#define TWIDDLE_DELAY 0
+#endif
+
+#define TWIDDLE_MASK ((1 << TWIDDLE_DELAY) - 1)
+
void
twiddle(void)
{
- static int pos;
+ static unsigned int pos;
if (!twiddle_toggle) {
- putchar(TWIDDLE_CHARS[pos++ & 3]);
- putchar('\b');
+ if ((pos & TWIDDLE_MASK) == 0) {
+ putchar(TWIDDLE_CHARS[(pos >> TWIDDLE_DELAY) & 3]);
+ putchar('\b');
+ }
+ pos++;
}
}
