AW: float behaivior on ARMv8-A

[N30dG]

-----Original-Nachricht-----
Betreff: Re: float behaivior on ARMv8-A
Datum: 2016-05-29T10:55:10+0200
Von: "Andrew Haley [via gcc]" <ml-node+s1065356n1268020h87@n5.nabble.com>
An: "N30dG" <christian.dreihsig@t-online.de>
 
 
 
On 28/05/16 08:37, N30dG wrote:
> I was able to locate the Problem(s).
> And I think this maybe could be a gcc-bug. It seem's that sin() and 
sqrt()
> works in less precision when compiled for AARCH64 (no ffast-math or other
> "unsafe" float-options enabled). I've worked that around by using sinl() 
and
> sqrtl() and now everythink work's like expected. I'm note sure if this is 
a
> bug or a normal behavior when compiling for different architectures.
>
> If this could be a bug and you need additional information feel free to
> write.

Sure.  If there's anything we can do to zoom in on the problem that
would help.  Significant inaccuracy in trig functions probably is a
bug.

Having said that, Standard C does not guarantee any particular
accuracy for these funtions.  Also, this is probably not a bug in GCC
itself but in whatever C library you're using.

Andrew.
 
Okay pls give me, some Day's. I don't have the Time by now. But next Week I 
have holidays and then I try to reproduce the problem in a small 
test-programm an provide you all the Information's needed.
 
Greetings
Christian


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