On 04/19/2016 04:48 PM, Tom Lane wrote:
> Pushed. Peter, what results do you get from these tests on your
> problematic machine?
acosd(x),
acosd(x) IN (0,60,90,120,180) AS acosd_exact
FROM (VALUES (-1), (-0.5), (0), (0.5), (1)) AS t(x);
- x | asind | asind_exact | acosd | acosd_exact
-------+-------+-------------+-------+-------------
- -1 | -90 | t | 180 | t
- -0.5 | -30 | t | 120 | t
- 0 | 0 | t | 90 | t
- 0.5 | 30 | t | 60 | t
- 1 | 90 | t | 0 | t
+ x | asind | asind_exact | acosd | acosd_exact
+------+----------------------+-------------+-------+-------------
+ -1 | -90 | t | 180 | t
+ -0.5 | -29.9999999999999964 | f | 120 | t
+ 0 | 0 | t | 90 | t
+ 0.5 | 29.9999999999999964 | f | 60 | t
+ 1 | 90 | t | 0 | t
(5 rows)
This is the same under the default -O2 and under -O0.
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