poly_int: store_bit_field bitrange

This patch changes the bitnum and bitsize arguments to
store_bit_field from unsigned HOST_WIDE_INTs to poly_uint64s.
The later part of store_bit_field_1 still needs to operate
on constant bit positions and sizes, so the patch splits
it out into a subfunction (store_integral_bit_field).

2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* expmed.h (store_bit_field): Take bitsize and bitnum as
	poly_uint64s rather than unsigned HOST_WIDE_INTs.
	* expmed.c (simple_mem_bitfield_p): Likewise.  Add a parameter
	that returns the byte size.
	(store_bit_field_1): Take bitsize and bitnum as
	poly_uint64s rather than unsigned HOST_WIDE_INTs.  Update call
	to simple_mem_bitfield_p.  Split the part that can only handle
	constant bitsize and bitnum out into...
	(store_integral_bit_field): ...this new function.
	(store_bit_field): Take bitsize and bitnum as poly_uint64s rather
	than unsigned HOST_WIDE_INTs.
	(extract_bit_field_1): Update call to simple_mem_bitfield_p.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r255877

gcc/ChangeLog

@@ -2,6 +2,23 @@
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
 
+	* expmed.h (store_bit_field): Take bitsize and bitnum as
+	poly_uint64s rather than unsigned HOST_WIDE_INTs.
+	* expmed.c (simple_mem_bitfield_p): Likewise.  Add a parameter
+	that returns the byte size.
+	(store_bit_field_1): Take bitsize and bitnum as
+	poly_uint64s rather than unsigned HOST_WIDE_INTs.  Update call
+	to simple_mem_bitfield_p.  Split the part that can only handle
+	constant bitsize and bitnum out into...
+	(store_integral_bit_field): ...this new function.
+	(store_bit_field): Take bitsize and bitnum as poly_uint64s rather
+	than unsigned HOST_WIDE_INTs.
+	(extract_bit_field_1): Update call to simple_mem_bitfield_p.
+
+2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
 	* lra-int.h (lra_reg): Change offset from int to poly_int64.
 	(lra_insn_recog_data): Change sp_offset from HOST_WIDE_INT
 	to poly_int64.

gcc/expmed.h

@@ -718,8 +718,7 @@ extern rtx expand_divmod (int, enum tree_code, machine_mode, rtx, rtx,
 			  rtx, int);
 #endif
 
-extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
-			     unsigned HOST_WIDE_INT,
+extern void store_bit_field (rtx, poly_uint64, poly_uint64,
 			     unsigned HOST_WIDE_INT,
 			     unsigned HOST_WIDE_INT,
 			     machine_mode, rtx, bool);