The Old New Thing

December 15, 2014 - The Old New Thing

When corporate policies meet precision scientific equipment

December 15, 2014 Dec 15, 2014 12/15/14
Raymond Chen
One of my colleagues used to work as an IT consultant, and one of his clients was a tobacco company. Since they were a tobacco company, the company policy on smoking was "You can smoke anywhere, any time." "Anywhere" includes the labs. The labs with very expensive precision scientific equipment. My colleague told me that this policy meant ...

Notes on calculating constants in SSE registers

December 15, 2014 Dec 15, 2014 12/15/14
Raymond Chen
There are a few ways to load constants into SSE registers. Load them from memory. Load them from general purpose registers via . Insert selected bits from general purpose registers via . Try to calculate them in clever ways. Loading constants from memory incurs memory access penalties. Loading or inserting them from general ...