V2 [PATCH] i386: Handle REG_EH_REGION note

[Jakub Jelinek]

On Thu, Mar 14, 2019 at 11:30:21AM +0800, H.J. Lu wrote:
> We need to split the basic block if we create new insns, which may
> throw exceptions, in the middle of the basic blocks.
> 
> Tested on AVX2 and AVX512 machines with and without
> 
> --with-arch=native
> 
> OK for trunk?

That looks much better, I see you chose to follow what lower-subreg.c does
here.  I just wonder if instead of the sbitmap of blocks to check for splitting it
wouldn't be more efficient to have an auto_vec<rtx_insn *> holding the exact
set_insns that need splitting after them and just grab the bb using
BLOCK_FOR_INSN.

	Jakub