[AArch64][obvious] In aarch64_class_max_nregs use UNITS_PER_VREG and UNITS_PER_WORD

	* config/aarch64/aarch64.c (aarch64_class_max_nregs):
	Use UNITS_PER_VREG and UNITS_PER_WORD instead of their direct
	values.

From-SVN: r223439

gcc/ChangeLog

+2015-05-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config/aarch64/aarch64.c (aarch64_class_max_nregs):
+	Use UNITS_PER_VREG and UNITS_PER_WORD instead of their direct
+	values.
+
 2015-05-20  Robert Suchanek  <robert.suchanek@imgtec.com>
 
 	* config/mips/mips.h (micromips_globals): Declare.

gcc/config/aarch64/aarch64.c

@@ -4922,8 +4922,9 @@ aarch64_class_max_nregs (reg_class_t regclass, machine_mode mode)
     case FP_REGS:
     case FP_LO_REGS:
       return
-	aarch64_vector_mode_p (mode) ? (GET_MODE_SIZE (mode) + 15) / 16 :
-				       (GET_MODE_SIZE (mode) + 7) / 8;
+	aarch64_vector_mode_p (mode)
+	  ? (GET_MODE_SIZE (mode) + UNITS_PER_VREG - 1) / UNITS_PER_VREG
+	  : (GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
     case STACK_REG:
       return 1;