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timer: improve overflow checks
Probably more correct and better readable. Although the special-casing of 0x1p63 is weird in terms of readability (the value itself is INT64_MAX+1, so it's already outside of range, but INT64_MAX is not exactly representable with double precision).
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@ -69,12 +69,13 @@ int64_t mp_time_relative_us(int64_t *t)
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int64_t mp_add_timeout(int64_t time_us, double timeout_sec)
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{
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assert(time_us > 0); // mp_time_us() returns strictly positive values
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double t = timeout_sec * 1000 * 1000;
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if (t >= (double)(INT64_MAX - time_us))
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double t = MPCLAMP(timeout_sec * (1000 * 1000), -0x1p63, 0x1p63);
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int64_t ti = t == 0x1p63 ? INT64_MAX : t;
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if (ti > INT64_MAX - time_us)
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return INT64_MAX;
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if (t <= -(double)time_us)
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if (ti <= -time_us)
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return 1;
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return time_us + (int64_t)t;
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return time_us + ti;
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}
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static void get_realtime(struct timespec *out_ts)
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