re PR target/84711 (AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.)

gcc/
2018-03-19  Tamar Christina  <tamar.christina@arm.com>

	PR target/84711
	* config/arm/arm.c (arm_can_change_mode_class): revert r258554.
       
gcc/testsuite/
2018-03-19  Tamar Christina  <tamar.christina@arm.com>

	PR target/84711
	* gcc.target/arm/big-endian-subreg.c: Delete.

From-SVN: r258642

gcc/ChangeLog

+2018-03-19  Tamar Christina  <tamar.christina@arm.com>
+
+	PR target/84711
+	* config/arm/arm.c (arm_can_change_mode_class): revert r258554.
+
 2018-03-18  Martin Liska  <mliska@suse.cz>
 
 	PR rtl-optimization/84635

gcc/config/arm/arm.c

@@ -31508,8 +31508,8 @@ arm_can_change_mode_class (machine_mode from, machine_mode to,
 {
   if (TARGET_BIG_END
       && !(GET_MODE_SIZE (from) == 16 && GET_MODE_SIZE (to) == 8)
-      && (GET_MODE_UNIT_SIZE (from) > UNITS_PER_WORD
-	  || GET_MODE_UNIT_SIZE (to) > UNITS_PER_WORD)
+      && (GET_MODE_SIZE (from) > UNITS_PER_WORD
+	  || GET_MODE_SIZE (to) > UNITS_PER_WORD)
       && reg_classes_intersect_p (VFP_REGS, rclass))
     return false;
   return true;

gcc/testsuite/ChangeLog

+2018-03-19  Tamar Christina  <tamar.christina@arm.com>
+
+	PR target/84711
+	* gcc.target/arm/big-endian-subreg.c: Delete.
+
 2018-03-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/84931

gcc/testsuite/gcc.target/arm/big-endian-subreg.c

-/* { dg-do compile } */
-/* { dg-require-effective-target arm_neon_ok } */
-/* { dg-require-effective-target arm_hf_eabi } */
-/* { dg-add-options arm_neon } */
-/* { dg-additional-options "-mfp16-format=ieee -mfloat-abi=hard" } */
-
-typedef __fp16 v4f16
-  __attribute__ ((vector_size (8)));
-
-v4f16 fn1 (v4f16 p)
-{
-  return p;
-}