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consider double epsilon when comapring crystal values

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This commit is contained in:
Vas Crabb 2018-06-25 14:35:04 +10:00
parent b281079d73
commit fdc9f38a8e
1 changed files with 6 additions and 2 deletions
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8
src/emu/xtal.cpp
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@ -48,6 +48,9 @@
#include "emu.h" #include "emu.h"
#include <cfloat>
#include <cmath>
// This array *must* stay in order, it's binary-searched // This array *must* stay in order, it's binary-searched
const double XTAL::known_xtals[] = { const double XTAL::known_xtals[] = {
@ -380,8 +383,9 @@ bool XTAL::validate(double base_clock)
if(slot > last_index) if(slot > last_index)
slot = slot ^ (step | (step >> 1)); slot = slot ^ (step | (step >> 1));
else { else {
double sfreq = known_xtals[slot]; const double sfreq = known_xtals[slot];
if(base_clock == sfreq) { const double diff = std::abs((base_clock - sfreq) / base_clock);
if(diff <= (2 * DBL_EPSILON)) {
last_correct_value = base_clock; last_correct_value = base_clock;
return true; return true;
} }