(find_reloads) [SMALL_REGISTER_CLASSES]:

Don't use preferred_class for a multiword register.

From-SVN: r2815

diff --git a/gcc/reload.c b/gcc/reload.c
index c4f46bfb91ae605ec6e512f3e03ec71fabc891ec..d440eeb69ec629ae0632b6bb4e4737f9160d1d71 100644 (file)
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -2685,11 +2685,18 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
             Don't bother with this if this alternative will accept this
             operand.
 
+            Don't do this for a multiword operand, if
+            we have to worry about small classes, because making reg groups
+            harder to allocate is asking for trouble.
+
             Don't do this if the preferred class has only one register
             because we might otherwise exhaust the class.  */
 
 
          if (! win && this_alternative[i] != (int) NO_REGS
+#ifdef SMALL_REGISTER_CLASSES
+             && GET_MODE_SIZE (operand_mode[i]) <= UNITS_PER_WORD
+#endif
              && reg_class_size[(int) preferred_class[i]] > 1)
            {
              if (! reg_class_subset_p (this_alternative[i],