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Cache all Buehlmann factors

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not just the last one.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2017-08-25 23:21:27 +02:00 • committed by Dirk Hohndel
parent 515b7b5fea
commit 456e2cec89
5 changed files with 43 additions and 33 deletions
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50
core/deco.c
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@ -321,46 +321,34 @@ double tissue_tolerance_calc(const struct dive *dive, double pressure)
/*
* Return buelman factor for a particular period and tissue index.
*
* We cache the last factor, since we commonly call this with the
* We cache the factor, since we commonly call this with the
* same values... We have a special "fixed cache" for the one second
* case, although I wonder if that's even worth it considering the
* more general-purpose cache.
*/
struct factor_cache {
int last_period;
double last_factor;
};
double n2_factor(int period_in_seconds, int ci)
double factor(int period_in_seconds, int ci, enum inertgas gas)
{
static struct factor_cache cache[16];
if (period_in_seconds == 1)
return buehlmann_N2_factor_expositon_one_second[ci];
if (period_in_seconds != cache[ci].last_period) {
cache[ci].last_period = period_in_seconds;
// ln(2)/60 = 1.155245301e-02
cache[ci].last_factor = 1 - exp(-period_in_seconds * 1.155245301e-02 / buehlmann_N2_t_halflife[ci]);
double factor;
if (period_in_seconds == 1) {
if (gas == N2)
return buehlmann_N2_factor_expositon_one_second[ci];
else
return buehlmann_He_factor_expositon_one_second[ci];
}
return cache[ci].last_factor;
}
double he_factor(int period_in_seconds, int ci)
{
static struct factor_cache cache[16];
if (period_in_seconds == 1)
return buehlmann_He_factor_expositon_one_second[ci];
if (period_in_seconds != cache[ci].last_period) {
cache[ci].last_period = period_in_seconds;
factor = cache_value(ci, period_in_seconds, gas);
if (!factor) {
// ln(2)/60 = 1.155245301e-02
cache[ci].last_factor = 1 - exp(-period_in_seconds * 1.155245301e-02 / buehlmann_He_t_halflife[ci]);
if (gas == N2)
factor = 1 - exp(-period_in_seconds * 1.155245301e-02 / buehlmann_N2_t_halflife[ci]);
else
factor = 1 - exp(-period_in_seconds * 1.155245301e-02 / buehlmann_He_t_halflife[ci]);
cache_insert(ci, period_in_seconds, gas, factor);
}
return cache[ci].last_factor;
return factor;
}
double calc_surface_phase(double surface_pressure, double he_pressure, double n2_pressure, double he_time_constant, double n2_time_constant)
@ -515,8 +503,8 @@ void add_segment(double pressure, const struct gasmix *gasmix, int period_in_sec
for (ci = 0; ci < 16; ci++) {
double pn2_oversat = pressures.n2 - deco_state->tissue_n2_sat[ci];
double phe_oversat = pressures.he - deco_state->tissue_he_sat[ci];
double n2_f = n2_factor(period_in_seconds, ci);
double he_f = he_factor(period_in_seconds, ci);
double n2_f = factor(period_in_seconds, ci, N2);
double he_f = factor(period_in_seconds, ci, HE);
double n2_satmult = pn2_oversat > 0 ? buehlmann_config.satmult : buehlmann_config.desatmult;
double he_satmult = phe_oversat > 0 ? buehlmann_config.satmult : buehlmann_config.desatmult;