[Bug target/124271] x86/AVX2: missed simplification — low32×low32→u64 vectorized multiply expands to generic u64-mul sequence instead of single vpmuludq

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124271

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-02-27
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
          Component|tree-optimization           |target

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
aarch64 with SVE GCC does:
```
.L2:
        ld1d    z31.d, p7/z, [x1, x2, lsl 3]
        ld1d    z30.d, p7/z, [x0, x2, lsl 3]
        and     z31.d, z31.d, #0xffffffff
        and     z30.d, z30.d, #0xffffffff
        mul     z30.d, z31.d, z30.d
        st1d    z30.d, p7, [x0, x2, lsl 3]
```

Which is decent so this is a target issue.