reload1.c (reload): If we can not perform a particular elimination when we…

reload1.c (reload): If we can not perform a particular elimination when we thought we could earlier...

        * reload1.c (reload): If we can not perform a particular elimination
        when we thought we could earlier, then we must always iterate through
        the loop at least one more time.
x86 should bootstrap with -O9 -fomit-frame-pointer again.

From-SVN: r23552

gcc/ChangeLog

+Sat Nov  7 00:54:55 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* reload1.c (reload): If we can not perform a particular elimination
+	when we thought we could earlier, then we must always iterate through
+	the loop at least one more time.
+
 Fri Nov  6 19:37:33 1998  Richard Henderson  <rth@cygnus.com>
 
 	* alpha.c (add_operand): Simplify the CONST_INT match.

gcc/reload1.c

@@ -927,6 +927,17 @@ reload (first, global, dumpfile)
 	    {
 	      spill_hard_reg (i, dumpfile, 1);
 	      did_spill = 1;
+
+	      /* Regardless of the state of spills, if we previously had
+		 a register that we thought we could eliminate, but no can
+		 not eliminate, we must run another pass.
+
+		 Consider pseudos which have an entry in reg_equiv_* which
+		 reference an eliminable register.  We must make another pass
+		 to update reg_equiv_* so that we do not substitute in the
+		 old value from when we thought the elimination could be
+		 performed.  */
+	      something_changed = 1;
 	    }
       }