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https://github.com/brain-hackers/u-boot-brain
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f215287bd5
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>
37 lines
839 B
C
37 lines
839 B
C
/*
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* (C) Copyright 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <div64.h>
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#include "dhry.h"
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static int do_dhry(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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ulong start, duration, vax_mips;
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u64 dhry_per_sec;
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int iterations = 1000000;
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if (argc > 1)
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iterations = simple_strtoul(argv[1], NULL, 10);
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start = get_timer(0);
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dhry(iterations);
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duration = get_timer(start);
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dhry_per_sec = lldiv(iterations * 1000ULL, duration);
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vax_mips = dhry_per_sec / 1757;
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printf("%d iterations in %lu ms: %lu/s, %lu DMIPS\n", iterations,
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duration, (ulong)dhry_per_sec, vax_mips);
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return 0;
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}
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U_BOOT_CMD(
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dhry, 2, 1, do_dhry,
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"[iterations] - run dhrystone benchmark",
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"\n - run the Dhrystone 2.1 benchmark, a rough measure of CPU speed\n"
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);
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