> On 13 Mar 2017, at 16:27, tu...@posteo.de wrote: > On 03/13 08:06, Martin Vaeth wrote: >> You appear to have experimental CFLAGS. Try without these. >> > Could you specify, what parts of that settings are experimental, > so that I will remove the correct ones?
Your flags are: CFLAGS=-march=native -O2 -pipe -ffast-math -fopenmp -fprefetch-loop-arrays -ftree-parallelize-loops=12 -funroll-all-loops -fwhole-program -mtune=amdfam10 Google each one of them, see what they do. There's probably a gcc manual that explains them. "funroll-loops" has long been a joke about Gentoo ricing. https://fun.irq.dk/funroll-loops.org/ I would guess you'd take that out and -ftree-parallelize-loops for a start. If you want to use the program, compile it with just `CFLAGS=-march=native -O2 -pipe` - I'm sure that will work. Then you can go back and see what options you can add without crashing the compile. These options often do not actually make things faster. Stroller.
