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Re: Math functions and rounding mode
On Mon, 1 Jan 2018, Patrick McGehearty wrote:
> When the current rounding mode is not FE_TONEAREST on entry to exp(),
> and if we do not change the rounding mode to FE_TONEAREST within exp(),
> then we get more 1 ulp errors according to the make check tests
> of exp(). I suspect users who care enough to try other rounding
> modes than FE_TONEAREST really care about those 1 ulp diffs.
1ulp errors in non-default rounding modes are definitely not a problem.
--
Joseph S. Myers
joseph@codesourcery.com