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From: "piliu at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/105134] New: tree-vectorize produces error code
Date: Sat, 02 Apr 2022 02:43:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105134

            Bug ID: 105134
           Summary: tree-vectorize produces error code
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: piliu at redhat dot com
  Target Milestone: ---

On x86_64, kexec-tools built with gcc-12 can not boot the 2nd kernel
successfully.

After debugging, it turns out to be related with "tree-vectorize" option.
As kexec-tools commit 1b03cf7 purgatory: do not enable vectorization
automatically for purgatory compiling.

I have no idea about what happens, but it seems to be related with the
generation of the code piece

void sha256_starts( sha256_context *ctx )
{
        ctx->total[0] =3D 0;
        ctx->total[1] =3D 0;

        ctx->state[0] =3D 0x6A09E667;
        ctx->state[1] =3D 0xBB67AE85;
        ctx->state[2] =3D 0x3C6EF372;
        ctx->state[3] =3D 0xA54FF53A;
        ctx->state[4] =3D 0x510E527F;
        ctx->state[5] =3D 0x9B05688C;
        ctx->state[6] =3D 0x1F83D9AB;
        ctx->state[7] =3D 0x5BE0CD19;
}=