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authorSimon Glass <sjg@chromium.org>2016-03-16 07:44:35 -0600
committerBin Meng <bmeng.cn@gmail.com>2016-03-17 10:27:27 +0800
commitf215287bd59c28443efe6118e7e958be733ce727 (patch)
treefa7546b7a988b13635f4d2a2128db6ca5c608905
parent9ab60493c9cf018e82b0a6d0f2f35792dfb12ba9 (diff)
downloadu-boot-f215287bd59c28443efe6118e7e958be733ce727.tar.gz
dhry: Correct dhrystone calculation for fast machines
At present samus reports about 5600 DMIPS. With the default iteration count this is OK, but if 10 million runs are performed it overflows. Fix it. Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--lib/dhry/cmd_dhry.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/dhry/cmd_dhry.c b/lib/dhry/cmd_dhry.c
index 5dc191ea62..d7e1e6a99b 100644
--- a/lib/dhry/cmd_dhry.c
+++ b/lib/dhry/cmd_dhry.c
@@ -6,11 +6,13 @@
#include <common.h>
#include <command.h>
+#include <div64.h>
#include "dhry.h"
static int do_dhry(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
- ulong start, duration, dhry_per_sec, vax_mips;
+ ulong start, duration, vax_mips;
+ u64 dhry_per_sec;
int iterations = 1000000;
if (argc > 1)
@@ -19,10 +21,10 @@ static int do_dhry(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
start = get_timer(0);
dhry(iterations);
duration = get_timer(start);
- dhry_per_sec = iterations * 1000 / duration;
+ dhry_per_sec = lldiv(iterations * 1000ULL, duration);
vax_mips = dhry_per_sec / 1757;
printf("%d iterations in %lu ms: %lu/s, %lu DMIPS\n", iterations,
- duration, dhry_per_sec, vax_mips);
+ duration, (ulong)dhry_per_sec, vax_mips);
return 0;
}