poly_int: get_inner_reference & co.

This patch makes get_inner_reference and ptr_difference_const return the
bit size and bit position as poly_int64s rather than HOST_WIDE_INTS.
The non-mechanical changes were handled by previous patches.

2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* tree.h (get_inner_reference): Return the bitsize and bitpos
	as poly_int64_pods rather than HOST_WIDE_INT.
	* fold-const.h (ptr_difference_const): Return the pointer difference
	as a poly_int64_pod rather than a HOST_WIDE_INT.
	* expr.c (get_inner_reference): Return the bitsize and bitpos
	as poly_int64_pods rather than HOST_WIDE_INT.
	(expand_expr_addr_expr_1, expand_expr_real_1): Track polynomial
	offsets and sizes.
	* fold-const.c (make_bit_field_ref): Take the bitpos as a poly_int64
	rather than a HOST_WIDE_INT.  Update call to get_inner_reference.
	(optimize_bit_field_compare): Update call to get_inner_reference.
	(decode_field_reference): Likewise.
	(fold_unary_loc): Track polynomial offsets and sizes.
	(split_address_to_core_and_offset): Return the bitpos as a
	poly_int64_pod rather than a HOST_WIDE_INT.
	(ptr_difference_const): Likewise for the pointer difference.
	* asan.c (instrument_derefs): Track polynomial offsets and sizes.
	* config/mips/mips.c (r10k_safe_mem_expr_p): Likewise.
	* dbxout.c (dbxout_expand_expr): Likewise.
	* dwarf2out.c (loc_list_for_address_of_addr_expr_of_indirect_ref)
	(loc_list_from_tree_1, fortran_common): Likewise.
	* gimple-laddress.c (pass_laddress::execute): Likewise.
	* gimple-ssa-store-merging.c (find_bswap_or_nop_load): Likewise.
	* gimplify.c (gimplify_scan_omp_clauses): Likewise.
	* simplify-rtx.c (delegitimize_mem_from_attrs): Likewise.
	* tree-affine.c (tree_to_aff_combination): Likewise.
	(get_inner_reference_aff): Likewise.
	* tree-data-ref.c (split_constant_offset_1): Likewise.
	(dr_analyze_innermost): Likewise.
	* tree-scalar-evolution.c (interpret_rhs_expr): Likewise.
	* tree-sra.c (ipa_sra_check_caller): Likewise.
	* tree-vect-data-refs.c (vect_check_gather_scatter): Likewise.
	* ubsan.c (maybe_instrument_pointer_overflow): Likewise.
	(instrument_bool_enum_load, instrument_object_size): Likewise.
	* gimple-ssa-strength-reduction.c (slsr_process_ref): Update call
	to get_inner_reference.
	* hsa-gen.c (gen_hsa_addr): Likewise.
	* sanopt.c (maybe_optimize_ubsan_ptr_ifn): Likewise.
	* tsan.c (instrument_expr): Likewise.
	* match.pd: Update call to ptr_difference_const.

gcc/ada/
	* gcc-interface/trans.c (Attribute_to_gnu): Track polynomial
	offsets and sizes.
	* gcc-interface/utils2.c (build_unary_op): Likewise.

gcc/cp/
	* constexpr.c (check_automatic_or_tls): Track polynomial
	offsets and sizes.

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

From-SVN: r255914

1 files changed, 8 insertions, 7 deletions

diff --git a/gcc/tree-affine.c b/gcc/tree-affine.c
index 5c6bb7d0906..e3d461e6912 100644
--- a/gcc/tree-affine.c
+++ b/gcc/tree-affine.c
@@ -267,7 +267,7 @@ tree_to_aff_combination (tree expr, tree type, aff_tree *comb)
   aff_tree tmp;
   enum tree_code code;
   tree cst, core, toffset;
-  HOST_WIDE_INT bitpos, bitsize;
+  poly_int64 bitpos, bitsize, bytepos;
   machine_mode mode;
   int unsignedp, reversep, volatilep;
 
@@ -324,12 +324,13 @@ tree_to_aff_combination (tree expr, tree type, aff_tree *comb)
       core = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize, &bitpos,
 				  &toffset, &mode, &unsignedp, &reversep,
 				  &volatilep);
-      if (bitpos % BITS_PER_UNIT != 0)
+      if (!multiple_p (bitpos, BITS_PER_UNIT, &bytepos))
 	break;
-      aff_combination_const (comb, type, bitpos / BITS_PER_UNIT);
+      aff_combination_const (comb, type, bytepos);
       if (TREE_CODE (core) == MEM_REF)
 	{
-	  aff_combination_add_cst (comb, wi::to_widest (TREE_OPERAND (core, 1)));
+	  tree mem_offset = TREE_OPERAND (core, 1);
+	  aff_combination_add_cst (comb, wi::to_poly_widest (mem_offset));
 	  core = TREE_OPERAND (core, 0);
 	}
       else
@@ -929,7 +930,7 @@ debug_aff (aff_tree *val)
 tree
 get_inner_reference_aff (tree ref, aff_tree *addr, poly_widest_int *size)
 {
-  HOST_WIDE_INT bitsize, bitpos;
+  poly_int64 bitsize, bitpos;
   tree toff;
   machine_mode mode;
   int uns, rev, vol;
@@ -948,10 +949,10 @@ get_inner_reference_aff (tree ref, aff_tree *addr, poly_widest_int *size)
       aff_combination_add (addr, &tmp);
     }
 
-  aff_combination_const (&tmp, sizetype, bitpos / BITS_PER_UNIT);
+  aff_combination_const (&tmp, sizetype, bits_to_bytes_round_down (bitpos));
   aff_combination_add (addr, &tmp);
 
-  *size = (bitsize + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
+  *size = bits_to_bytes_round_up (bitsize);
 
   return base;
 }