mul + div with 64 bit signed ints on IA32

[Thomas R. Truscott]

> There are possibilities to speed up the following operations for IA32
>        int64_t * int64_t
>        int64_t / int64_t
>        int64_t % int64_t       (?)
> Interests?

I would be more interested in speedups for:
        int64_t / smallconst
        int64_t % smallconst

For division, the multiply-by-reciprocal trick
used for "int32_t / smallconst" might work.
For mod, it might be possible to do something like
  int64_t (x) % smallconst =>  x - (x/smallconst)*smallconst


> It this used in any benchmark?

I don't know, but have an additional question:
On systems which support both a 32-bit and 64-bit ABI,
do vendors report benchmarks for both?
Or just the one that gives the best numbers?

Tom Truscott