i386.c (ix86_decompose_address): Check for SI_REG using REGNO of base_reg directly.

	* config/i386/i386.c (ix86_decompose_address): Check for SI_REG
	using REGNO of base_reg directly.

From-SVN: r162899

gcc/ChangeLog

+2010-08-05  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/i386.c (ix86_decompose_address): Check for SI_REG
+	using REGNO of base_reg directly.
+
 2010-08-05  Jie Zhang  <jie@codesourcery.com>
 
 	PR tree-optimization/45144

gcc/config/i386/i386.c

@@ -10417,8 +10417,7 @@ ix86_decompose_address (rtx addr, struct ix86_address *out)
      to test cfun for being non-NULL. */
   if (TARGET_K6 && cfun && optimize_function_for_speed_p (cfun)
       && base_reg && !index_reg && !disp
-      && REG_P (base_reg)
-      && REGNO_REG_CLASS (REGNO (base_reg)) == SIREG)
+      && REG_P (base_reg) && REGNO (base_reg) == SI_REG)
     disp = const0_rtx;
 
   /* Special case: encode reg+reg instead of reg*2.  */