[backport from gcc-4.7/trunk, PR46603 fix part 3 of 3 <mikpe@it.uu.se>]

gcc/

2011-10-27  Eric Botcazou  <ebotcazou@adacore.com>

	PR rtl-optimization/46603
	PR bootstrap/50879
	* reload.c (push_reload): In the out case, restore previous behavior
	for subregs that don't have word mode.

--- gcc-4.6.2/gcc/reload.c.~1~	2011-11-05 13:14:59.000000000 +0100
+++ gcc-4.6.2/gcc/reload.c	2011-11-05 13:18:31.000000000 +0100
@@ -1136,6 +1136,14 @@ push_reload (rtx in, rtx out, rtx *inloc
 			   / UNITS_PER_WORD)))
 #endif
 		  ))
+	  || (REG_P (SUBREG_REG (out))
+	      && REGNO (SUBREG_REG (out)) < FIRST_PSEUDO_REGISTER
+	      /* The case of a word mode subreg
+		 is handled differently in the following statement.  */
+	      && ! (GET_MODE_SIZE (outmode) <= UNITS_PER_WORD
+		    && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
+		        > UNITS_PER_WORD))
+	      && ! HARD_REGNO_MODE_OK (subreg_regno (out), outmode))
 	  || (secondary_reload_class (0, rclass, outmode, out) != NO_REGS
 	      && (secondary_reload_class (0, rclass, GET_MODE (SUBREG_REG (out)),
 					  SUBREG_REG (out))