On 1/11/2013 2:46 PM, Tom Stockfisch wrote: > I need to force all double precision calculations to proceed strictly in 64-bit -- no 80-bit > intel register arithmetic. Can someone tell me the current function calls or > command line settings to achieve this on both MacOS and linux? > > I need this to be able to track down platform-dependent differences in numerical code. >
Check whether you have any functions that return float/double/real values. By convention, on X86/X64, the value is returned in register st0, even if the "legacy" x87 FPU unit is not used for any floating point calculations.