* struct-equiv.c (rtx_equiv_p): Fix POST_MODIFY case.

From-SVN: r111929

gcc/ChangeLog

+2006-03-10  J"orn Rennecke <joern.rennecke@st.com>
+
+	* struct-equiv.c (rtx_equiv_p): Fix POST_MODIFY case.
+
 2006-03-09  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	* tree-ssa-phiopt.c (tree_ssa_phiopt): Add cfgchanged variable.

gcc/struct-equiv.c

@@ -570,17 +570,13 @@ rtx_equiv_p (rtx *xp, rtx y, int rvalue, struct equiv_info *info)
 	  return false;
 	x_dest1 = XEXP (x, 0);
 	/* validate_change might have changed the destination.  Put it back
-	   so that we can do a valid source match.  */
+	   so that we can do a proper match for its role a an input.  */
 	XEXP (x, 0) = x_dest0;
-	if (!rtx_equiv_p (&XEXP (x, 1), XEXP (y, 1), 0, info))
+	if (!rtx_equiv_p (&XEXP (x, 0), XEXP (y, 0), 1, info))
 	  return false;
 	gcc_assert (x_dest1 == XEXP (x, 0));
 	/* Process source.  */
 	return rtx_equiv_p (&XEXP (x, 1), XEXP (y, 1), 1, info);
-      if (!rtx_equiv_p (&XEXP(x, 0), XEXP (y, 0), 0, info))
-	return false;
-      /* Process both subexpressions as inputs.  */
-      break;
       }
     case CLOBBER:
       gcc_assert (rvalue < 0);