[LAD] Floating point Denormals: C++ and Waf

[David Robillard]

On Thu, 2012-08-02 at 20:31 +0200, Martin Homuth-Rosemann wrote:
[...]
> // denormals are zero
> static inline float daz( float f )
> {
>    // define an aliasing type to perform a "reinterpret cast"
>    typedef __u32 __attribute__ (( __may_alias__ )) u32bit;
>    if ( *( (u32bit*)&f ) & 0x7F000000 ) // E > 1 : normal.
>      return f;
>    else // E <= 1 : zero or _almost_ denormal
>         // (may become denormal with next operation)
>      return 0.0;
> }
[...]
> float reverb( float xin )
> {
>    static float yout = 0.0;
>    static float xv0, xv1, yv0, yv1;
>    float x, y;
> 
>    // additional feedback
>    x  = daz( xin/8 + yout/64 );

Branch per sample, eeck...

-dr

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