[Bug c/105134] New: tree-vectorize produces error code

[piliu at redhat dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105134

            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] = 0;
        ctx->total[1] = 0;

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