[cfp-interest 3857] Fwd: [SC22WG14.35726] N3731 Range bounds for math functions

[Jim Thomas]

This regards action item

>     Jim: Add agenda item to fix range bounds problem for complex fcns (as done for real functions in N3731).


Following is background for the discussion.

- Jim Thomas

> Begin forwarded message:
> 
> From: RAJAN BHAKTA <rbhakta at us.ibm.com>
> Subject: [SC22WG14.35726] N3731 Range bounds for math functions
> Date: March 5, 2026 at 3:19:10 PM PST
> To: Joseph Myers <josmyers at redhat.com>, "sc22wg14 at open-std.org" <sc22wg14 at open-std.org>
> 
> Thanks for the review!
> 
> CFP will look at making similar changes for cacos, casin, catan, cacosh, casinh, catanh in a future paper.
> 
> Regards,
> 
> CFP
>  
> From: owner-sc22wg14 at open-std.org <owner-sc22wg14 at open-std.org> on behalf of Joseph Myers <josmyers at redhat.com>
> Date: Monday, October 20, 2025 at 6:58 PM
> To: sc22wg14 at open-std.org <sc22wg14 at open-std.org>
> Subject: [EXTERNAL] [SC22WG14.34179] N3731 Range bounds for math functions
> 
> A comment on the N3731 proposal to reword specifications about the range
> of values for mathematical functions where correct rounding might produce
> a result outside a given interval:
> 
> There's similar wording "in the interval" for various <complex.h>
> functions, where I'd also expect that it should not be required that the
> rounded result actually lies inside that interval and so the wording
> should probably have similar changes: cacos, casin, catan, cacosh, casinh,
> catanh.
> 
> --
> Joseph S. Myers
> josmyers at redhat.com
> 

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