Re: Differences (performance/precision) between 32/64-bit exp

[Dennis Wassel <dwassel at math dot uni-bremen dot de>]

Am 14.04.2011 00:56, schrieb Ángel González:
> I also get the 1.0000000000000002e+00 output when compiling as 32 bits
> if using -O3 or
> -O2  -finline-functions (in such case, the exp function is not even
> called, it's resolved in compile time to the longs <1, 1072693248> and
> <620756992>).
> 
> gcc 4.5.2

Thanks Angel,

I appreciate this solves the issue for the toy program I used to
demonstrate it, but the real issue is more complex than that, because
the caller is libgfortran, and because we are essentially dealing with
user input. Hence no compile-time resolution, and also no inlining.

Cheers,
Dennis

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