[Bug c/43490] sin(x) (actually probably all trig) is inaccurate for large x

[simon dot fenney at imgtec dot com]

------- Comment #3 from simon dot fenney at imgtec dot com  2010-03-23 12:20 
-------
(In reply to comment #2)
> duplicate of PR43405.
> 
It's doesn't seem to be the same. I just tried the test source from  43405 and
on the old system (gcc 3.4.6) (which I assumed was working) got:

         double precision: sin(1e22) = -0.8522008497671888
         quad precison: sin(1e22)=0.4626130407646018

while on the systems I was worried about, got
         double precision: sin(1e22) = 0.4626130407646017
         quad precison: sin(1e22)=0.4626130407646018

Using maple and computing the result to 30 decimal places, I get
                -.852200849767188801772705893753
so it looks like there is an additional problem.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43490