re PR target/32413 (internal compiler error: in reload_cse_simplify_operands, at postreload.c:396)

    PR target/32413
    * config/i386/i386.c (ix86_register_move_cost): Rise the cost of
    moves between MMX/SSE registers to at least 8 units to prevent
    ICE caused by non-tieable SI/HI/QImodes in SSE registers.

From-SVN: r125951

gcc/ChangeLog

 2007-06-22  Uros Bizjak  <ubizjak@gmail.com>
 
+	PR target/32413
+	* config/i386/i386.c (ix86_register_move_cost): Rise the cost of
+	moves between MMX/SSE registers to at least 8 units to prevent
+	ICE caused by non-tieable SI/HI/QImodes in SSE registers. 
+
+2007-06-22  Uros Bizjak  <ubizjak@gmail.com>
+
 	* config/i386/i386.c (override_options): Correct x86_sahf
 	setting condition.
 

gcc/config/i386/i386.c

@@ -20279,7 +20279,15 @@ ix86_register_move_cost (enum machine_mode mode, enum reg_class class1,
   /* Moves between SSE/MMX and integer unit are expensive.  */
   if (MMX_CLASS_P (class1) != MMX_CLASS_P (class2)
       || SSE_CLASS_P (class1) != SSE_CLASS_P (class2))
-    return ix86_cost->mmxsse_to_integer;
+
+    /* ??? By keeping returned value relatively high, we limit the number
+       of moves between integer and MMX/SSE registers for all targets.
+       Additionally, high value prevents problem with x86_modes_tieable_p(),
+       where integer modes in MMX/SSE registers are not tieable
+       because of missing QImode and HImode moves to, from or between
+       MMX/SSE registers.  */
+    return MAX (ix86_cost->mmxsse_to_integer, 8);
+
   if (MAYBE_FLOAT_CLASS_P (class1))
     return ix86_cost->fp_move;
   if (MAYBE_SSE_CLASS_P (class1))