| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [COMMITTERS] pgsql: Add trigonometric functions that work in degrees. |
| Date: | 2016-04-25 02:42:29 |
| Message-ID: | 571D8415.3050109@gmx.net |
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| Lists: | pgsql-committers pgsql-hackers |
On 04/21/2016 08:18 PM, Tom Lane wrote:
> Hm. This seems to prove that we're not getting exactly 1.0 from
> (asin(x) / asin_0_5) with x = 0.5, but I'm having a hard time guessing
> why that might be so when all the other cases work.
>
> Could you send along the assembler code generated by the compiler (-S
> output) for float.c? Maybe that would shed some light. Probably the
> -O0 version would be easier to read.
Attached is a smaller test program that prints 29.9999999999999964 (same
as failing test result) as well as its assembler code.
| Attachment | Content-Type | Size |
|---|---|---|
| test.c | text/x-csrc | 232 bytes |
| test.s | text/plain | 1.2 KB |
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