On Monday, 8 December 2014 at 23:40:21 UTC, Martin Nowak wrote:
On 12/08/2014 06:20 PM, John Colvin wrote:
To conceptually get what it's doing here, the trick is that
it's
offsetting the values so as to simulate unsigned comparisons
using
signed instructions.
All too easy, but would've taken me a pen and paper to realize
:).
I wouldn't have seen it so easily but I've spent the last few
weeks doing discrete Fourier analysis, so I've got very used to
spotting modulo arithmetic tricks of exactly this kind.
