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Hi Martin,
Can I pick your brain on how this works?
My biggest question is why to use the typedef__u32__attribute__ line

inside an inline function.  Don't you only have to do this once?  If

so, wouldn't you place that line outside the function?
On Thu, Aug 2, 2012 at 7:39 AM, Martin Homuth-Rosemann

 wrote:
> static inline float daz( float f )
If we remove the "static" scope of this function, could we make a

header and re-use this code efficiently?
> {

quoted text
>   // define an aliasing type to perform a "reinterpret cast"

>   typedef __u32 __attribute__ (( __may_alias__ )) u32bit;

>   if ( *( (u32bit*)&f ) & 0x7F000000 ) // E > 1 : normal.

Is there a 64-bit version of the same?  This appears to work with a

32-bit unsigned int as a pointer, meaning that it's applicable to

32-bits.  How does a "reinterpret cast" work?
What this does is check the exponent is non-zero, right?  Doesn't this

also depend on the mantissa?  for example, if the mantissa is 2^24-1

and the exponent is zero, is that number still a denormal?
>     return f;

quoted text
>   else // E <= 1 : zero or _almost_ denormal

>        // (may become denormal with next operation)

>     return 0.0;

> }

>

> Ciao, Martin

Thanks for the code--any further explanation would be enlightening.
Chuck

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