re PR rtl-optimization/10592 ([arm] caller-save incorrectly handles a reloaded SET_DEST operand)

PR optimization/10592
* caller-save.c (mark_referenced_regs): Don't short-circuit a reg
or subreg in SET_DEST if it isn't a hard register.

From-SVN: r74747

gcc/ChangeLog

+2003-12-17  Richard Earnshaw  <rearnsha@arm.com>
+
+	PR optimization/10592
+	* caller-save.c (mark_referenced_regs): Don't short-circuit a reg
+	or subreg in SET_DEST if it isn't a hard register.
+
 2003-12-17  David Edelsohn  <edelsohn@gnu.org>
 
 	* collect2.c (main): Add -fno-profile-arcs -fno-test-coverage

gcc/caller-save.c

@@ -568,8 +568,10 @@ mark_referenced_regs (rtx x)
     {
       x = SET_DEST (x);
       code = GET_CODE (x);
-      if (code == REG || code == PC || code == CC0
+      if ((code == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
+	  || code == PC || code == CC0
 	  || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG
+	      && REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER
 	      /* If we're setting only part of a multi-word register,
 		 we shall mark it as referenced, because the words
 		 that are not being set should be restored.  */