2011-03-03  Richard Sandiford  <richard.sandiford@linaro.org>

	gcc/
	* ee.c (reg_use_p): Handle subregs of promoted vars.

=== modified file 'gcc/ee.c'
--- old/gcc/ee.c	2010-12-10 15:33:37 +0000
+++ new/gcc/ee.c	2011-03-03 17:08:58 +0000
@@ -209,7 +209,11 @@
 
       *regno = REGNO (reg);
 
-      if (paradoxical_subreg_p (use))
+      /* Non-paradoxical SUBREGs of promoted vars guarantee that the
+	 upper (elided) bits of the inner register have a particular value.
+	 For our purposes, such SUBREGs act as a full reference to the
+	 inner register.  */
+      if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
         *size = GET_MODE_BITSIZE (GET_MODE (reg));
       else
         *size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));