re PR rtl-optimization/83213 (peephole bug with -O2)

	PR rtl-optimization/83213
	* recog.c (peep2_attempt): Copy over CROSSING_JUMP_P from peepinsn
	to last if both are JUMP_INSNs.

From-SVN: r256728

gcc/ChangeLog

 2018-01-16  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/83213
+	* recog.c (peep2_attempt): Copy over CROSSING_JUMP_P from peepinsn
+	to last if both are JUMP_INSNs.
+
 	PR tree-optimization/83843
 	* gimple-ssa-store-merging.c
 	(imm_store_chain_info::output_merged_store): Handle bit_not_p on

gcc/recog.c

@@ -3446,6 +3446,8 @@ peep2_attempt (basic_block bb, rtx_insn *insn, int match_len, rtx_insn *attempt)
   last = emit_insn_after_setloc (attempt,
 				 peep2_insn_data[i].insn,
 				 INSN_LOCATION (peepinsn));
+  if (JUMP_P (peepinsn) && JUMP_P (last))
+    CROSSING_JUMP_P (last) = CROSSING_JUMP_P (peepinsn);
   before_try = PREV_INSN (insn);
   delete_insn_chain (insn, peep2_insn_data[i].insn, false);