Floating Point + Threads?

[Walter Bright]

On 4/16/2011 11:51 AM, Sean Kelly wrote:
>
> On Apr 16, 2011, at 11:43 AM, dsimcha wrote:
>>>
>>> Close: If I add this instruction to the function for the new thread, the
>>> difference goes away. The relevant statement is:
>>>
>>> auto t = new Thread( { asm { fninit; } res2 = sumRange(terms); } );
>>>
>>> At any rate, this is a **huge** WTF that should probably be fixed in
>>> druntime. Once I understand it a little better, I'll file a bug report.
>>
>> Read up a little on what fninit does, etc.  This is IMHO a druntime bug.
>> Filed as http://d.puremagic.com/issues/show_bug.cgi?id=5847 .
>
> Really a Windows bug that should be fixed in druntime :-)  I know I'm
> splitting hairs.  This will be fixed for the next release.


The dmd startup code (actually the C startup code) does an fninit. I never 
thought about new thread starts. So, yeah, druntime should do an fninit on 
thread creation.