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-rw-r--r--src/emu/xtal.cpp8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/emu/xtal.cpp b/src/emu/xtal.cpp
index f9e641b900a..4d76f13d1d0 100644
--- a/src/emu/xtal.cpp
+++ b/src/emu/xtal.cpp
@@ -48,6 +48,9 @@
#include "emu.h"
+#include <cfloat>
+#include <cmath>
+
// This array *must* stay in order, it's binary-searched
const double XTAL::known_xtals[] = {
@@ -382,8 +385,9 @@ bool XTAL::validate(double base_clock)
if(slot > last_index)
slot = slot ^ (step | (step >> 1));
else {
- double sfreq = known_xtals[slot];
- if(base_clock == sfreq) {
+ const double sfreq = known_xtals[slot];
+ const double diff = std::abs((base_clock - sfreq) / base_clock);
+ if(diff <= (2 * DBL_EPSILON)) {
last_correct_value = base_clock;
return true;
}