[Intel-gfx] [RFC 14/15] drm/i915: Use new IS_GEN range helpers

[Chris Wilson]

Quoting Ville Syrjälä (2018-02-09 14:48:43)
> If only the compiler would be smart and be able to see that something
> like
> 
> #define INTEL_GEN(dev_priv) (ilog2((dev_priv)->gen_mask & CONFIG_GEN_MASK))
> 
> if (INTEL_GEN(dev_priv) < 8)
>         ...
> 
> can never be true...
> 
> Not sure it can't actually. But I assume people have actually tried
> that.

gcc-7 doesn't appear to be that smart. :(
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-Chris