|Re: [hatari-devel] Re: FPU update|
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Am 21.01.2017 um 17:47 schrieb Toni Wilen <twilen@xxxxxxxxxx>: >> Attached is screenshot that shows errors, what do they mean? (Is it >> correct or incorrect value or something else?) > > FSGLMUL and FSGLDIV error cause most likely is this (which is not > handled yet): > > "The input operand mantissas truncate to single precision before the > multiply operation" (from M68000PRM.pdf) > > (How to emulate this correctly?) > These SGL functions are quite weird. I wrote some special functions assuming this: - The input values are truncated (not rounded) to single precision mantissa (after normalization, if necessary) - The output value is rounded to single precision mantissa with these exceptions: - Output overflows: Infinity or biggest normal number with extended mantissa - Output severely underflows: Zero or smallest denormalized number with extended mantissa Please try the appended patch, but be aware this is highly experimental. I'll have a look at FNEG and FABS tomorrow. But on first view this can only be caused by missing NaN handling in those functions. Other than this these functions are quite simple.
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