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----Original Message---- >From: Brian Dessent >Sent: 30 June 2005 16:58 > Dave Korn wrote: > >> Absolutely, there's a rounding error of some sort. Compare the >> difference when compiling the testcase with -mno-cygwin (i.e. using >> mingw maths lib): > > Isn't this just a case of the Cygwin math library choosing "round to > even" and the MSVCRT/mingw library choosing "0.5 always rounds up"? No, I really don't think that's the case, in fact I reckon they both default to the same roundingmode, and the discrepancy remains the same in any rounding mode. Have a go with the attached version of the testcase, which allows you to choose any rounding mode you like at runtime: just pass a hex constant from the set (0, 0x400, 0x800, 0xc00) on the command line. cheers, DaveK -- Can't think of a witty .sigline today....
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