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perf_timer: rewrite to make it clear there is no division by zero
It could have happened if epee::misc_utils::get_ns_count is buggy, at a push Coverity 182561
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@ -49,16 +49,15 @@ namespace
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#ifdef __x86_64__
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uint64_t get_ticks_per_ns()
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{
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uint64_t t0 = epee::misc_utils::get_ns_count();
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uint64_t t0 = epee::misc_utils::get_ns_count(), t1;
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uint64_t r0 = get_tick_count();
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while (1)
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{
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uint64_t t = epee::misc_utils::get_ns_count();
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if (t - t0 > 1*1000000000) break; // work one second
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t1 = epee::misc_utils::get_ns_count();
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if (t1 - t0 > 1*1000000000) break; // work one second
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}
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uint64_t t1 = epee::misc_utils::get_ns_count();
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uint64_t r1 = get_tick_count();
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uint64_t tpns256 = 256 * (r1 - r0) / (t1 - t0);
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return tpns256 ? tpns256 : 1;
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