jump.c (jump_optimize_1): Do not delete assignments to internal_arg_pointer.

        * jump.c (jump_optimize_1): Do not delete assignments to
        internal_arg_pointer.
        * cse.c (delete_trivially_dead_insns): Always consider a set of
        the internal_arg_pointer live.

From-SVN: r28957

gcc/ChangeLog

+Sat Aug 28 19:36:05 1999  Jeffrey A Law  (law@cygnus.com)
+
+	* jump.c (jump_optimize_1): Do not delete assignments to 
+	internal_arg_pointer.
+	* cse.c (delete_trivially_dead_insns): Always consider a set of
+	the internal_arg_pointer live.
+
 Sat Aug 28 16:24:31 1999  Richard Henderson  <rth@cygnus.com>
 
 	* flow.c (flow_delete_insn_chain): Rename from delete_insn_chain.

gcc/cse.c

@@ -9215,7 +9215,13 @@ delete_trivially_dead_insns (insns, nreg)
 		else if (GET_CODE (SET_DEST (elt)) != REG
 			 || REGNO (SET_DEST (elt)) < FIRST_PSEUDO_REGISTER
 			 || counts[REGNO (SET_DEST (elt))] != 0
-			 || side_effects_p (SET_SRC (elt)))
+			 || side_effects_p (SET_SRC (elt))
+			 /* An ADDRESSOF expression can turn into a use of the
+			    internal arg pointer, so always consider the
+			    internal arg pointer live.  If it is truly dead,
+			    flow will delete the initializing insn.  */
+			 || (SET_DEST (elt)
+			     == current_function_internal_arg_pointer))
 		  live_insn = 1;
 	      }
 	    else if (GET_CODE (elt) != CLOBBER && GET_CODE (elt) != USE)

gcc/jump.c

@@ -290,7 +290,12 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
 	       might arrange to use that reg for real.  */	       
 	    && REGNO_LAST_NOTE_UID (REGNO (SET_DEST (set))) == INSN_UID (insn)
 	    && ! side_effects_p (SET_SRC (set))
-	    && ! find_reg_note (insn, REG_RETVAL, 0))
+	    && ! find_reg_note (insn, REG_RETVAL, 0)
+	    /* An ADDRESSOF expression can turn into a use of the internal arg
+	       pointer, so do not delete the initialization of the internal
+	       arg pointer yet.  If it is truly dead, flow will delete the
+	       initializing insn.  */
+	    && SET_DEST (set) != current_function_internal_arg_pointer)
 	  delete_insn (insn);
       }