https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43147
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Target Milestone|--- |13.0
Resolution|--- |FIXED
--- Comment #21 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Constant folding part was fixed in GCC 12 but combining shuffles was fixed in
GCC 13.
That is for:
```
__m128 m;
int main()
{
m = _mm_shuffle_ps(m, m, 0xC9); // Those two shuffles together swap
pairs
m = _mm_shuffle_ps(m, m, 0x2D); // And could be optimized to 0x4E
printv(m);
return 0;
}
```
GCC 13+ Produces:
```
movaps m(%rip), %xmm0
shufps $78, %xmm0, %xmm0
movaps %xmm0, m(%rip)
call _Z6printvDv4_f
```
instead of what was there in GCC 12:
```
movaps m(%rip), %xmm0
shufps $201, %xmm0, %xmm0
shufps $45, %xmm0, %xmm0
movaps %xmm0, m(%rip)
```
So closing as fixed in GCC 13.
