simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>): Don't optimize a…

simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>): Don't optimize a truncate of a mem if it is a vector mode.

2012-10-02  Andrew Pinski  <apinski@cavium.com>

	* simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>):
	Don't optimize a truncate of a mem if it is a vector mode.

From-SVN: r192006

gcc/ChangeLog

+2012-10-02  Andrew Pinski  <apinski@cavium.com>
+
+	* simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>):
+	Don't optimize a truncate of a mem if it is a vector mode.
+
 2012-10-02  Alexandre Oliva <aoliva@redhat.com>
 
 	PR debug/54551

gcc/simplify-rtx.c

@@ -873,6 +873,7 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
       /* A truncate of a memory is just loading the low part of the memory
 	 if we are not changing the meaning of the address. */
       if (GET_CODE (op) == MEM
+	  && !VECTOR_MODE_P (mode)
 	  && !MEM_VOLATILE_P (op)
 	  && !mode_dependent_address_p (XEXP (op, 0), MEM_ADDR_SPACE (op)))
 	return rtl_hooks.gen_lowpart_no_emit (mode, op);