Fix glibc -O2 iso646.i abort.

	* config/ia64/ia64.c (rws_access_reg): New local write_count.  If
	is_predicate_reg, then take max write_count of register pair.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34915 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

+2000-07-07  Jim Wilson  <wilson@cygnus.com>
+
+	* config/ia64/ia64.c (rws_access_reg): New local write_count.  If
+	is_predicate_reg, then take max write_count of register pair.
+
 2000-07-07  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 	* tradcpp.c (main): Rename label `include' to `add_include' to

gcc/config/ia64/ia64.c

@@ -2313,6 +2313,8 @@ rws_access_reg (regno, flags, pred)
 
   if (flags.is_write)
     {
+      int write_count;
+
       /* One insn writes same reg multiple times?  */
       if (rws_insn[regno].write_count > 0)
 	abort ();
@@ -2328,7 +2330,12 @@ rws_access_reg (regno, flags, pred)
       if (is_predicate_reg)
 	rws_update (rws_insn, regno + 1, flags, pred);
 
-      switch (rws_sum[regno].write_count)
+      /* ??? Likewise.  */
+      write_count = rws_sum[regno].write_count;
+      if (is_predicate_reg)
+	write_count = MAX (write_count, rws_sum[regno + 1].write_count);
+
+      switch (write_count)
 	{
 	case 0:
 	  /* The register has not been written yet.  */