[vorbis-dev] optimizing float to int conversions
dean-list-vorbis-dev at arctic.org
Wed May 5 10:34:12 PDT 2004
On Thu, 6 May 2004, illiminable wrote:
> Assuming your ints are of size 32 bits (I'm pretty sure this is a safe
> assumption in ogg), this is not necessary if you shift any 32 bit int by 32
> or more bits in either direction you get zero anyway (is there some case i'm
> not thinking of that this is not true ?)... so you can remove a a comparison
> and jump there. All bits left of the 24th bit would be zero anyway.
C doesn't specify what happens when you shift more than the data size...
and on x86 the low 5-bits of variable shift amounts are used regardless of
what is in the upper bits. it doesn't truncate to 0 like you're
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