On 4/21/07, Paul Brook <[EMAIL PROTECTED]> wrote:
> 8 mult x*y -- signed multiply, low 32 bits
> 12 umult x*y -- unsigned multiply, low 32 bits
How are these different? Under normal circumstances the low half of a multiply
result is independent of the signedness.
Yep. You're right. 0xFFFF * 0xFFFF = 0xFFFE0001, so if you take only
the lower half, you get 1, which is what you expect regardless of the
sign.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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