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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102575] Failure to optimize double _Complex
 stores to use largest loads/stores possible
Date: Sun, 03 Oct 2021 18:48:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102575

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |tree-optimization
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-10-03
           Severity|normal                      |enhancement

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

/app/example.cpp:5:1: note:  =3D=3D=3D vect_slp_analyze_bb =3D=3D=3D
/app/example.cpp:5:1: note:   =3D=3D=3D vect_analyze_data_refs =3D=3D=3D
/app/example.cpp:5:1: missed:   not vectorized: no vectype for stmt: *a_2(D=
) =3D
__complex__ (1.0e+0, 0.0);
 scalar_type: complex double
/app/example.cpp:5:1: missed:   not vectorized: no vectype for stmt:
MEM[(complex double *)a_2(D) + 16B] =3D __complex__ (1.0e+0, 0.0);
 scalar_type: complex double
/app/example.cpp:5:1: note:   =3D=3D=3D vect_analyze_data_ref_accesses =3D=
=3D=3D
/app/example.cpp:5:1: missed:  not vectorized: no grouped stores in basic
block.
/app/example.cpp:5:1: note: ***** Analysis failed with vector mode VOID
void test (complex double * a)

Yes SLP does not understand how to handle complex double

And then expand splits the complex type store into two different stores.=