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Date: Fri, 08 Jan 2021 10:06:53 +0100
From: Paul Zimmermann <>
To: Rich Felker <>
Subject: Re: issue with exp10l

       Dear Rich,

> OK, on further investigation it looks like your problem is that you're
> not passing a NAN but a trap representation. The representation is
> only a nan if the exponent value is 0x7fff. For exponent not 0x7fff or
> 0, the high bit of the significand must be set; otherwise it's a trap
> representation.

thank you. I have now forced the high bit of the significand to be set,
and it works better indeed. I have found errors up to 40 ulps for exp10l:

exp10l 0xd.41cfe8659e3d7eep+8l 40.1

Best regards,

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