diff options
Diffstat (limited to 'src/emu/xtal.cpp')
-rw-r--r-- | src/emu/xtal.cpp | 8 |
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; } |