Originally posted by birdie
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They can be like the Odd Couple of compiler flags.
Personally, I compile my stuff with the one that Michael didn't test: -O2 -march=native (or -march=nzver2). I have a low cache 4650G APU so I stick with -O2.
Michael Can you rerun that test with -O2 -march=native. I suspect it'll have a performance hit just like -O3 native. My speculation is the compiler isn't optimized for the tested CPU so -march=native could be the culprit.
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