https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119103
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Very suboptimal AVX2 code |shift not demotated when
|generation of simple shift |shift amount range is known
|loop |
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
RTL handles &0xf but if the range is there we don't optimize it:
E.g. it can be shown by:
```
#include <stdint.h>
void lshift(uint16_t *x, uint8_t amount)
{
x[0] = x[0] << (amount&0xF);
}
void lshift1(uint16_t *x, uint8_t amount)
{
if (amount >= 16)
__builtin_unreachable();
x[0] = x[0] << (amount&0xF);
}
```
