rs6000: Put back the 's' output modifier

It turns out the 's' output modifier is used in some glibc math code,
and is in an installed header even.  So let's put it back, it is much
less of a burden supporting it a bit longer than to deal with the fallout.
(It is also being fixed for glibc.)


	* config/rs6000/rs6000.c (print_operand): Rollback 's' removal.

From-SVN: r232900

gcc/ChangeLog

+2016-01-27  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.c (print_operand): Rollback 's' removal.
+
 2016-01-27  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/68398

gcc/config/rs6000/rs6000.c

@@ -19949,6 +19949,14 @@ print_operand (FILE *file, rtx x, int code)
 	fprintf (file, "%d", 128 >> (REGNO (x) - CR0_REGNO));
       return;
 
+    case 's':
+      /* Low 5 bits of 32 - value */
+      if (! INT_P (x))
+	output_operand_lossage ("invalid %%s value");
+      else
+	fprintf (file, HOST_WIDE_INT_PRINT_DEC, (32 - INTVAL (x)) & 31);
+      return;
+
     case 't':
       /* Like 'J' but get to the OVERFLOW/UNORDERED bit.  */
       gcc_assert (REG_P (x) && GET_MODE (x) == CCmode);