[PATCH] Don't do double divide in powf.

[Jim Wilson]

On 12/12/2017 05:04 AM, Corinna Vinschen wrote:
> On Dec 11 19:45, Jim Wilson wrote:
>> -		        exc.retval = 0.0/0.0;	/* X/Open allow NaN */
>> +		        exc.retval = nan("");	/* X/Open allow NaN */
> 
> As far as I can see, that still pulls in an unnecessary function call,
> nan().
> 
> What about using NAN?  That's basically __builtin_nanf("") and usually
> resolves without function call on any platform.

I don't see any place in the math dir that currently uses NAN like this, 
but there are multiple places calling nan(""), so I did it that way.  I 
don't care which way it is done.  But it looks like Craig Howland has a 
legitimate objection, so I will try float 0.0/0.0 divide instead.

Jim