xtensa: Fix PR target/78603

2016-11-29  Max Filippov  <jcmvbkbc@gmail.com>
gcc/
	* config/xtensa/xtensa.c (hwloop_optimize): Don't emit zero
	overhead loop start between a call and its CALL_ARG_LOCATION
	note.

From-SVN: r242979

gcc/ChangeLog

+2016-11-29  Max Filippov  <jcmvbkbc@gmail.com>
+
+	PR target/78603
+	* config/xtensa/xtensa.c (hwloop_optimize): Don't emit zero
+	overhead loop start between a call and its CALL_ARG_LOCATION
+	note.
+
 2016-11-29  Waldemar Brodkorb  <wbx@openadk.org>
 
 	* config/bfin/linux.h (CPP_SPEC): Define.

gcc/config/xtensa/xtensa.c

@@ -4167,7 +4167,10 @@ hwloop_optimize (hwloop_info loop)
       entry_after = BB_END (entry_bb);
       while (DEBUG_INSN_P (entry_after)
              || (NOTE_P (entry_after)
-                 && NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK))
+                 && NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK
+		 /* Make sure we don't split a call and its corresponding
+		    CALL_ARG_LOCATION note.  */
+                 && NOTE_KIND (entry_after) != NOTE_INSN_CALL_ARG_LOCATION))
         entry_after = PREV_INSN (entry_after);
 
       emit_insn_after (seq, entry_after);