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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/106081] missed vectorization
Date: Fri, 24 Jun 2022 16:14:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106081

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is an attempt to vectorize by hand, but it seems we do not generate
vpmovsxwd for the vector short->double conversion

struct pixels
{
        short a __attribute__ ((vector_size(4*2)));
} *pixels;
struct dpixels
{
        double a __attribute__ ((vector_size(8*4)));
};
typedef double v4df __attribute__ ((vector_size (32)));

struct dpixels
test(double *k)
{
        struct dpixels results=3D{};
        for (int u=3D0; u<10000;u++,k--)
        {
                results.a +=3D *k*__builtin_convertvector (pixels[u].a, v4d=
f);
        }
        return results;
}

clang seems to do right thing here.=