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Message: [QUOTE="Miles Bader, post: 4127670"] Perhaps that's this (from the gcc manual): `-fcx-limited-range' When enabled, this option states that a range reduction step is not needed when performing complex division. Also, there is no checking whether the result of a complex multiplication or division is `NaN + I*NaN', with an attempt to rescue the situation in that case. The default is `-fno-cx-limited-range', but is enabled by `-ffast-math'. This option controls the default setting of the ISO C99 `CX_LIMITED_RANGE' pragma. Nevertheless, the option applies to all languages. `-fcx-fortran-rules' Complex multiplication and division follow Fortran rules. Range reduction is done as part of complex division, but there is no checking whether the result of a complex multiplication or division is `NaN + I*NaN', with an attempt to rescue the situation in that case. The default is `-fno-cx-fortran-rules'. -miles [/QUOTE]