[Bug target/117562] [15 Regression] 40% slowdown of 482.sphinx3 on Zen4, Zen5 since r15-5120-g9a62c149589103

[liuhongt at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117562

--- Comment #8 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---

> vec_unpacks_hi_v4sf create an unintialized (reg:V4SF 853), I guess it may
> confuse LRA to allocate a mem for it.

For simple case
void
foo (double* a, float* b, int n)
{
    for (int i = 0; i != n; i++)
      a[i] = b[i];
}

RA works ok, there's no extra spill there.