It's probably a user mistake that they didn't know what they really
wanted. Since no processor that supports AVX2 fails to support the rest
of x86-64-v3, we should enable all of that so we can make use of its
features. Notably, we may want to use FMA at some point in QtGui, and
the compiler will likely use BMI, BMI2, and LZCNT on its own (see
qnumeric.h).
Compiling with -mavx2 will produce GCC these errors:
qsimd_p.h:266:8: error: #error "Please enable all x86-64-v3 extensions; you probably want to use -march=haswell or -march=x86-64-v3 instead of -mavx2"
qsimd_p.h:263:49: error: ‘__BMI__’ was not declared in this scope
qsimd_p.h:263:59: error: ‘__BMI2__’ was not declared in this scope
qsimd_p.h:263:70: error: ‘__F16C__’ was not declared in this scope
qsimd_p.h:263:81: error: ‘__FMA__’ was not declared in this scope
qsimd_p.h:263:91: error: ‘__LZCNT__’ was not declared in this scope; did you mea
Change-Id: Ib42b3adc93bf4d43bd55fffd16c10f8b6a775f3f
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
ad65bbe4c0