i386: Handle REG_EH_REGION note

When we split:

(insn 18 17 76 2 (set (reg:SF 88 [ _19 ])
        (float:SF (mem/c:SI (symbol_ref:DI ("d") [flags 0x2]  <var_decl 0x7fd6d8290c60 d>) [1 d+0 S4 A32]))) "x.ii":4:20 170 {*floatsisf2}
     (expr_list:REG_EH_REGION (const_int 2 [0x2])
        (nil)))

to

(insn 94 17 18 2 (set (reg:V4SF 115)
        (vec_merge:V4SF (vec_duplicate:V4SF (float:SF (mem/c:SI (symbol_ref:DI ("d") [flags 0x2]  <var_decl 0x7f346837ac60 d>) [1 d+0 S4 A32])))
            (reg:V4SF 114)
            (const_int 1 [0x1]))) "x.ii":4:20 -1
     (nil))
(insn 18 94 76 2 (set (reg:SF 88 [ _19 ])
        (subreg:SF (reg:V4SF 115) 0)) "x.ii":4:20 112 {*movsf_internal}
     (expr_list:REG_EH_REGION (const_int 2 [0x2])
        (nil)))

we must copy the REG_EH_REGION note to the first insn and split the block
after the newly added insn.  The REG_EH_REGION on the second insn will be
removed later since it no longer traps.

gcc/

	PR target/89650
	* config/i386/i386.c (remove_partial_avx_dependency): Handle
	REG_EH_REGION note.

gcc/testsuite/

	PR target/89650
	* g++.target/i386/pr89650.C: New test.

From-SVN: r269694

gcc/ChangeLog

+2019-03-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/89650
+	* config/i386/i386.c (remove_partial_avx_dependency): Handle
+	REG_EH_REGION note.
+
 2019-03-14  Martin Liska  <mliska@suse.cz>
 
 	PR other/89712

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 *> control_flow_insns;
+
   FOR_EACH_BB_FN (bb, cfun)
     {
       FOR_BB_INSNS (bb, insn)
@@ -2875,6 +2877,17 @@ remove_partial_avx_dependency (void)
 	  set_insn = emit_insn_before (set, insn);
 	  df_insn_rescan (set_insn);
 
+	  if (cfun->can_throw_non_call_exceptions)
+	    {
+	      /* Handle REG_EH_REGION note.  */
+	      rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
+	      if (note)
+		{
+		  control_flow_insns.safe_push (set_insn);
+		  add_reg_note (set_insn, REG_EH_REGION, XEXP (note, 0));
+		}
+	    }
+
 	  src = gen_rtx_SUBREG (dest_mode, vec, 0);
 	  set = gen_rtx_SET (dest, src);
 
@@ -2925,6 +2938,23 @@ remove_partial_avx_dependency (void)
       df_insn_rescan (set_insn);
       df_process_deferred_rescans ();
       loop_optimizer_finalize ();
+
+      if (!control_flow_insns.is_empty ())
+	{
+	  free_dominance_info (CDI_DOMINATORS);
+
+	  unsigned int i;
+	  FOR_EACH_VEC_ELT (control_flow_insns, i, insn)
+	    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.  */
+		bb = BLOCK_FOR_INSN (insn);
+		split_block (bb, insn);
+		rtl_make_eh_edge (NULL, bb, BB_END (bb));
+	      }
+	}
     }
 
   bitmap_obstack_release (NULL);

gcc/testsuite/ChangeLog

+2019-03-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/89650
+	* g++.target/i386/pr89650.C: New test.
+
 2019-03-14  Richard Biener  <rguenther@suse.de>
 
 	* gcc.dg/gimplefe-13.c: Adjust.

gcc/testsuite/g++.target/i386/pr89650.C

+// { dg-do compile { target c++11 } }
+// { dg-options "-O2 -flive-range-shrinkage -fno-tree-dce -fno-dce -fnon-call-exceptions -mavx" }
+
+int d, e;
+struct g {
+  float f;
+  g(float h) : f(h + d) {}
+  ~g() {}
+};
+struct i {
+  int a;
+  int b : 4;
+  int &c;
+  i(int h) : a(), b(), c(h) {}
+};
+int main() {
+  i j(e);
+  g k[]{1, 2};
+}