[Mesa-dev] [PATCH] Improve ONE_DIV_LN2 and M_PI constants

[Ian Romanick]

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On 12/01/2010 01:40 PM, Matt Turner wrote:
> 1/ln(2) is equivalent to log2(e), so define it as such.
> 
> log2(e) = ln(e)/ln(2) = 1/ln(2)
> 
> M_PI is updated to add some precision (value found in my math.h header).

I wish I had noticed this when I added M_LOG2E.  It seems better to
replace the single use of ONE_DIV_LN2 (in prog_statevars.c) with M_LOG2E.
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