V3 [PATCH] i386: Handle REG_EH_REGION note

[Jakub Jelinek]

On Thu, Mar 14, 2019 at 09:08:17PM +0800, H.J. Lu wrote:
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -2819,6 +2819,8 @@ remove_partial_avx_dependency (void)
>    rtx set;
>    rtx v4sf_const0 = NULL_RTX;
>  
> +  auto_vec<rtx_insn *> splitted_insn;

Perhaps throwing_insns or flow_transfer_insns or control_flow_insns
instead?

> +	  unsigned int i;
> +	  FOR_EACH_VEC_ELT (splitted_insn, i, insn)

I actually meant something like:
	    if (control_flow_insn_p (insn))
	      {
		/* Split the block after insn.  There will be a
		   fallthru edge, which is OK so we keep it.  We
		   have to create the exception edges ourselves.  */
		split_block (bb, insn);
		rtl_make_eh_edge (NULL, bb, BB_END (bb));
	      }

only inside of the FOR_EACH_VEC_ELT.  If there is more than one
insn that needs splitting in the bb, it will be in the vector as well
and handled in some later iteration.

	Jakub