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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>
utp
Simon Glass 2016-03-16 07:44:35 -06:00 committed by Bin Meng
parent 9ab60493c9
commit f215287bd5
1 changed files with 5 additions and 3 deletions
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8
lib/dhry/cmd_dhry.c
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@ -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;
}