David Schultz wrote:
Strangely, gcc in FreeBSD 5.0 actually generates *slower* code when compiling for more recent architectures than when compiling for a 386. I don't know whether that is a bug in gcc or whether gcc is using some fancy feature like SSE that the kernel handles poorly on context switches. I think there was some discussion on the lists about it earlier.
The reason is that the optimization done by GCC are ill balanced. All the scheduling of instractions and what a not - which would be fine on a micro scope level is causing so much higher pressure on the CPUs caches that the code is actually loosing.
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