Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
Thank you Marc for your opinion. It makes sense to me that we should have the possibility to mimic the IEEE-754 standard, thus we should have `fpow` function as well. I have updated the RFC and would like to start the voting if there are no new comments. Kind regards, Jorg Sowa
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
Hi Jorg, On 13.01.24 00:25, Jorg Sowa wrote: Thank you for the suggestions. I agree that error message should be more meaningful. I changed it. The main driver of this change is to match the division by zero behavior for both operators which can operate on both integers and floats. Would it make sense to create a function `fpow` similarly to `fdiv` for the correct IEEE 754 logic? As of your note of consistent behavior here, in your RFC I don't see any note about operating on float - It's all about int. It would be good to explicitly describe both int and float behavior in your RFC. About `fpow` - I personally never felled the need to use `fdiv` but as `fdiv` was explicitly introduced to expose IEEE-754 semantics I think it totally makes sense to add `fpow` as well. Greetings, Marc Kind regards, Jorg OpenPGP_0x3936ABF753BC88CE.asc Description: OpenPGP public key OpenPGP_signature.asc Description: OpenPGP digital signature
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
Hello everyone, If there is no other feedback I would like to start voting in the next few days. Kind regards, Jorg
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
Thank you for the suggestions. I agree that error message should be more meaningful. I changed it. The main driver of this change is to match the division by zero behavior for both operators which can operate on both integers and floats. Would it make sense to create a function `fpow` similarly to `fdiv` for the correct IEEE 754 logic? Kind regards, Jorg
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
On Thursday, 11 January 2024 at 21:47, tag Knife wrote: > On Thu, 11 Jan 2024 at 21:29, Jorg Sowa jorg.s...@gmail.com wrote: > > > Hello everyone! > > > > I want to start the discussion on the RFC: Raising zero to the power of > > negative number > > > > Link: https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number > > > > Kind regards, > > Jorg > > > IEEE 754 dictates that an infinity should be the expected output for all > these scenarios. IEEE 754 only deals with floating point numbers, and even then if you want IEEE 754 behaviour for division you need to use fdiv() as of PHP 8.0 as any division by 0 throws this error since https://wiki.php.net/rfc/engine_warnings#division_by_zero got accepted. I think this change makes sense but would rather have an improved wording/Error as proposed by Ben. Best regards, Gina P. Banyard -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: https://www.php.net/unsub.php
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
On 1/11/24 15:47, tag Knife wrote: On Thu, 11 Jan 2024 at 21:29, Jorg Sowa wrote: Hello everyone! I want to start the discussion on the RFC: Raising zero to the power of negative number Link: https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number Kind regards, Jorg IEEE 754 dictates that an infinity should be the expected output for all these scenarios. If I'm reading the text of IEEE 754-2019 correctly, it means that the division by zero error should occur when an operation on finite operands gives an exact infinite result. "The divideByZero exception shall be signaled if and only if an exact infinite result is defined for an operation on finite operands." Cheers, Ben OpenPGP_signature.asc Description: OpenPGP digital signature
Re: [PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
On Thu, 11 Jan 2024 at 21:29, Jorg Sowa wrote: > Hello everyone! > > I want to start the discussion on the RFC: Raising zero to the power of > negative number > > Link: https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number > > Kind regards, > Jorg > IEEE 754 dictates that an infinity should be the expected output for all these scenarios.
[PHP-DEV] [RFC][Discussion] Raising zero to the power of negative number
Hello everyone! I want to start the discussion on the RFC: Raising zero to the power of negative number Link: https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number Kind regards, Jorg
