https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92665
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Wilco from comment #3)
> I think it's because many intrinsics in arm_neon.h still use asm which
> inhibits most optimizations.
NO in this case it is not.
Take:
#include "arm_neon.h"
float64x1_t fun(float64x2_t a, float64x2_t b) {
return vget_low_f64(b);
}
double fun1(float64x2_t a, float64x2_t b) {
return b[0];
}
---- CUT ----
Both of these should be optimized to just
fmov d0, d1
ret
Even worse take:
#include "arm_neon.h"
float64x1_t fun(float64x2_t a, float64x2_t b) {
return vget_low_f64(b) + vget_high_f64(b);
}
double fun1(float64x2_t a, float64x2_t b) {
return b[0] + b[1];
}
---- CUT ---
