13 Feb
2013
13 Feb
'13
7:41 a.m.
On Mon, Feb 11, 2013 at 6:47 PM, Johan Holmquist
By "agressive optimisation" I mean an optimisation that drastically reduces run-time performance of (some part of) the program. So I guess automatic vectorisation could fall into this term.
Even something like running the program on a different CPU or different OS version can "drastically" improve or harm the performance of a particular program, without any change in the compiler itself. If you care about performance, the only real recourse is to have benchmarks / performance tests that verify the things you care about, and run them regularly in your target environment so that any performance-critical changes are noticed right away. -- mithrandi, i Ainil en-Balandor, a faer Ambar