[src/trunk]: src/sys/arch/macppc/dev Add a null asm statement in adb_read_dat...

[tsutsui <tsutsui%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b0263994f502
branches:  trunk
changeset: 526546:b0263994f502
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun May 05 18:36:03 2002 +0000

description:
Add a null asm statement in adb_read_date_time()
to avoid wrong reordering by gcc-2.95.3 with -fgcse.

XXX Should we disable -fgcse everywhere?

diffstat:

 sys/arch/macppc/dev/adb_direct.c |  5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diffs (19 lines):

diff -r 5f7341077f63 -r b0263994f502 sys/arch/macppc/dev/adb_direct.c
--- a/sys/arch/macppc/dev/adb_direct.c  Sun May 05 18:29:06 2002 +0000
+++ b/sys/arch/macppc/dev/adb_direct.c  Sun May 05 18:36:03 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: adb_direct.c,v 1.23 2002/05/05 18:29:06 tsutsui Exp $  */
+/*     $NetBSD: adb_direct.c,v 1.24 2002/05/05 18:36:03 tsutsui Exp $  */
 
 /* From: adb_direct.c 2.02 4/18/97 jpw */
 
@@ -1892,6 +1892,9 @@
                while (0 == flag)       /* wait for result */
                        ;
 
+               /* XXX to avoid wrong reordering by gcc 2.95.x with -fgcse */
+               __asm volatile ("" ::: "memory");
+
                memcpy(time, output + 1, 4);
                return 0;