[Bug target/119142] [15 Regression] Many regressions since r15-7852 on i686-linux

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119142

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 60673
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60673&action=edit
A patch

I am testing this with

  if (GENERAL_REGNO_P (hard_regno))
    {
      /* push is 1 byte while typical spill is 4-5 bytes.
         ??? We probably should adjust size costs accordingly.
         Costs are relative to reg-reg move that has 2 bytes for 32bit
         and 3 bytes otherwise.  Be sure that no cost table sets cost
         to 2, so we end up with 0.  */
      if (mem_cost <= 2 || optimize_function_for_size_p (cfun))
        return 1;
      return mem_cost - 2;
    }