On Thu, 21 Jun 2012, William J. Schmidt wrote:
> As promised, this breaks out the changes to the IVOPTS cost model and
> the added function in double-int.c. Please let me know if you would
> rather see me attempt to consolidate the IVOPTS logic into expmed.c per
> Richard H's suggestion.
If we start to use it from multiple places that definitely makes sense,
but you can move the stuff as a followup.
> I ran into a glitch with multiply_by_const_cost. The original code
> declared a static htab_t in the function and allocated it on demand.
> When I tried adding a second one in the same manner, I ran into a
> locking problem in the memory management library code during a call to
> delete_htab. The original implementation seemed a bit dicey to me
> anyway, so I changed this to explicitly allocate and deallocate the hash
> tables on (entry to/exit from) IVOPTS.
Huh. That's weird and should not happen. Still it makes sense to
move this to a per-function cache given that its size is basically
unbound.
Can you introduce a initialize_costs () / finalize_costs () function
pair that allocates / frees the tables and sets a global flag that
you can then assert in the functions using those tables?
> + if (speed)
> + speed = 1;
I suppose this is because bool is not bool when building with a
C compiler? It really looks weird and if such is necessary I'd
prefer something like
> +add_regs_cost (enum machine_mode mode, bool speed)
> {
> + static unsigned costs[NUM_MACHINE_MODES][2];
> rtx seq;
> unsigned cost;
unsigned sidx = speed ? 0 : 1;
>
> + if (costs[mode][sidx])
> + return costs[mode][sidx];
> +
instead.
Otherwise the patch is ok.
Thanks,
Richard.
> This reduces the scope of the hash table from a compilation unit to each
> individual function. If it's preferred to maintain compilation unit
> scope, then the initialization/finalization of the htabs can be pushed
> out to do_compile. But I doubt it's worth that.
>
> Bootstrapped and tested on powerpc64-unknown-linux-gnu with no new
> regressions. Ok for trunk?
>
> Thanks,
> Bill
>
>
> 2012-06-21 Bill Schmidt <wschm...@linux.ibm.com>
>
> * double-int.c (double_int_multiple_of): New function.
> * double-int.h (double_int_multiple_of): New decl.
> * tree-ssa-loop-ivopts.c (add_cost, zero_cost): Remove undefs.
> (mbc_entry_hash): New forward decl.
> (mbc_entry_eq): Likewise.
> (zero_cost): Change to no_cost.
> (mult_costs): New static var.
> (tree_ssa_iv_optimize_init): Initialize mult_costs.
> (add_cost): Change to add_regs_cost; distinguish costs by speed.
> (multiply_regs_cost): New function.
> (add_const_cost): Likewise.
> (extend_or_trunc_reg_cost): Likewise.
> (negate_reg_cost): Likewise.
> (multiply_by_cost): Change to multiply_by_const_cost; distinguish
> costs by speed.
> (get_address_cost): Change add_cost to add_regs_cost; change
> multiply_by_cost to multiply_by_const_cost.
> (force_expr_to_var_cost): Change zero_cost to no_cost; change
> add_cost to add_regs_cost; change multiply_by_cost to
> multiply_by_const_cost.
> (split_cost): Change zero_cost to no_cost.
> (ptr_difference_cost): Likewise.
> (difference_cost): Change zero_cost to no_cost; change multiply_by_cost
> to multiply_by_const_cost.
> (get_computation_cost_at): Change add_cost to add_regs_cost; change
> multiply_by_cost to multiply_by_const_cost.
> (determine_use_iv_cost_generic): Change zero_cost to no_cost.
> (determine_iv_cost): Change add_cost to add_regs_cost.
> (iv_ca_new): Change zero_cost to no_cost.
> (tree_ssa_iv_optimize_finalize): Release storage for mult_costs.
> * tree-ssa-address.c (most_expensive_mult_to_index): Change
> multiply_by_cost to multiply_by_const_cost.
> * tree-flow.h (multiply_by_cost): Change to multiply_by_const_cost.
> (add_regs_cost): New decl.
> (multiply_regs_cost): Likewise.
> (add_const_cost): Likewise.
> (extend_or_trunc_reg_cost): Likewise.
> (negate_reg_cost): Likewise.
>
>
> Index: gcc/double-int.c
> ===================================================================
> --- gcc/double-int.c (revision 188839)
> +++ gcc/double-int.c (working copy)
> @@ -865,6 +865,26 @@ double_int_umod (double_int a, double_int b, unsig
> return double_int_mod (a, b, true, code);
> }
>
> +/* Return TRUE iff PRODUCT is an integral multiple of FACTOR, and return
> + the multiple in *MULTIPLE. Otherwise return FALSE and leave *MULTIPLE
> + unchanged. */
> +
> +bool
> +double_int_multiple_of (double_int product, double_int factor,
> + bool unsigned_p, double_int *multiple)
> +{
> + double_int remainder;
> + double_int quotient = double_int_divmod (product, factor, unsigned_p,
> + TRUNC_DIV_EXPR, &remainder);
> + if (double_int_zero_p (remainder))
> + {
> + *multiple = quotient;
> + return true;
> + }
> +
> + return false;
> +}
> +
> /* Set BITPOS bit in A. */
> double_int
> double_int_setbit (double_int a, unsigned bitpos)
> Index: gcc/double-int.h
> ===================================================================
> --- gcc/double-int.h (revision 188839)
> +++ gcc/double-int.h (working copy)
> @@ -150,6 +150,8 @@ double_int double_int_divmod (double_int, double_i
> double_int double_int_sdivmod (double_int, double_int, unsigned, double_int
> *);
> double_int double_int_udivmod (double_int, double_int, unsigned, double_int
> *);
>
> +bool double_int_multiple_of (double_int, double_int, bool, double_int *);
> +
> double_int double_int_setbit (double_int, unsigned);
> int double_int_ctz (double_int);
>
> Index: gcc/tree-ssa-loop-ivopts.c
> ===================================================================
> --- gcc/tree-ssa-loop-ivopts.c (revision 188839)
> +++ gcc/tree-ssa-loop-ivopts.c (working copy)
> @@ -89,13 +89,11 @@ along with GCC; see the file COPYING3. If not see
> #include "target.h"
> #include "tree-inline.h"
> #include "tree-ssa-propagate.h"
> -
> -/* FIXME: add_cost and zero_cost defined in exprmed.h conflict with local
> uses.
> - */
> #include "expmed.h"
> -#undef add_cost
> -#undef zero_cost
>
> +static hashval_t mbc_entry_hash (const void *);
> +static int mbc_entry_eq (const void*, const void *);
> +
> /* FIXME: Expressions are expanded to RTL in this pass to determine the
> cost of different addressing modes. This should be moved to a TBD
> interface between the GIMPLE and RTL worlds. */
> @@ -162,7 +160,7 @@ typedef struct
> complex expressions and addressing modes). */
> } comp_cost;
>
> -static const comp_cost zero_cost = {0, 0};
> +static const comp_cost no_cost = {0, 0};
> static const comp_cost infinite_cost = {INFTY, INFTY};
>
> /* The candidate - cost pair. */
> @@ -386,6 +384,9 @@ struct iv_ca_delta
>
> static VEC(tree,heap) *decl_rtl_to_reset;
>
> +/* Cached costs for multiplies by constants. */
> +static htab_t mult_costs[2];
> +
> static comp_cost force_expr_to_var_cost (tree, bool);
>
> /* Number of uses recorded in DATA. */
> @@ -869,6 +870,9 @@ tree_ssa_iv_optimize_init (struct ivopts_data *dat
> htab_inv_expr_eq, free);
> data->inv_expr_id = 0;
> decl_rtl_to_reset = VEC_alloc (tree, heap, 20);
> +
> + mult_costs[0] = htab_create (100, mbc_entry_hash, mbc_entry_eq, free);
> + mult_costs[1] = htab_create (100, mbc_entry_hash, mbc_entry_eq, free);
> }
>
> /* Returns a memory object to that EXPR points. In case we are able to
> @@ -3057,16 +3061,19 @@ adjust_setup_cost (struct ivopts_data *data, unsig
>
> /* Returns cost of addition in MODE. */
>
> -static unsigned
> -add_cost (enum machine_mode mode, bool speed)
> +unsigned
> +add_regs_cost (enum machine_mode mode, bool speed)
> {
> - static unsigned costs[NUM_MACHINE_MODES];
> + static unsigned costs[NUM_MACHINE_MODES][2];
> rtx seq;
> unsigned cost;
>
> - if (costs[mode])
> - return costs[mode];
> + if (speed)
> + speed = 1;
>
> + if (costs[mode][speed])
> + return costs[mode][speed];
> +
> start_sequence ();
> force_operand (gen_rtx_fmt_ee (PLUS, mode,
> gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1),
> @@ -3079,7 +3086,7 @@ adjust_setup_cost (struct ivopts_data *data, unsig
> if (!cost)
> cost = 1;
>
> - costs[mode] = cost;
> + costs[mode][speed] = cost;
>
> if (dump_file && (dump_flags & TDF_DETAILS))
> fprintf (dump_file, "Addition in %s costs %d\n",
> @@ -3087,6 +3094,160 @@ adjust_setup_cost (struct ivopts_data *data, unsig
> return cost;
> }
>
> +/* Returns cost of multiplication in MODE. */
> +
> +unsigned
> +multiply_regs_cost (enum machine_mode mode, bool speed)
> +{
> + static unsigned costs[NUM_MACHINE_MODES][2];
> + rtx seq;
> + unsigned cost;
> +
> + if (speed)
> + speed = 1;
> +
> + if (costs[mode][speed])
> + return costs[mode][speed];
> +
> + start_sequence ();
> + force_operand (gen_rtx_fmt_ee (MULT, mode,
> + gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1),
> + gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 2)),
> + NULL_RTX);
> + seq = get_insns ();
> + end_sequence ();
> +
> + cost = seq_cost (seq, speed);
> + if (!cost)
> + cost = 1;
> +
> + costs[mode][speed] = cost;
> +
> + if (dump_file && (dump_flags & TDF_DETAILS))
> + fprintf (dump_file, "Multiplication in %s costs %d\n",
> + GET_MODE_NAME (mode), cost);
> + return cost;
> +}
> +
> +/* Returns cost of addition with a constant in MODE. */
> +
> +unsigned
> +add_const_cost (enum machine_mode mode, bool speed)
> +{
> + static unsigned costs[NUM_MACHINE_MODES][2];
> + rtx seq;
> + unsigned cost;
> +
> + if (speed)
> + speed = 1;
> +
> + if (costs[mode][speed])
> + return costs[mode][speed];
> +
> + /* Arbitrarily generate insns for x + 2, as the exact constant
> + shouldn't matter. */
> + start_sequence ();
> + force_operand (gen_rtx_fmt_ee (PLUS, mode,
> + gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1),
> + gen_int_mode (2, mode)),
> + NULL_RTX);
> + seq = get_insns ();
> + end_sequence ();
> +
> + cost = seq_cost (seq, speed);
> + if (!cost)
> + cost = 1;
> +
> + costs[mode][speed] = cost;
> +
> + if (dump_file && (dump_flags & TDF_DETAILS))
> + fprintf (dump_file, "Addition to constant in %s costs %d\n",
> + GET_MODE_NAME (mode), cost);
> + return cost;
> +}
> +
> +/* Returns cost of extend or truncate in MODE. */
> +
> +unsigned
> +extend_or_trunc_reg_cost (tree type_to, tree type_from, bool speed)
> +{
> + static unsigned costs[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
> + rtx seq;
> + unsigned cost;
> + enum machine_mode mode_to = TYPE_MODE (type_to);
> + enum machine_mode mode_from = TYPE_MODE (type_from);
> + tree size_to = TYPE_SIZE (type_to);
> + tree size_from = TYPE_SIZE (type_from);
> + enum rtx_code code;
> +
> + gcc_assert (TREE_CODE (size_to) == INTEGER_CST
> + && TREE_CODE (size_from) == INTEGER_CST);
> +
> + if (speed)
> + speed = 1;
> +
> + if (costs[mode_to][mode_from][speed])
> + return costs[mode_to][mode_from][speed];
> +
> + if (tree_int_cst_lt (size_to, size_from))
> + code = TRUNCATE;
> + else if (TYPE_UNSIGNED (type_to))
> + code = ZERO_EXTEND;
> + else
> + code = SIGN_EXTEND;
> +
> + start_sequence ();
> + gen_rtx_fmt_e (code, mode_to,
> + gen_raw_REG (mode_from, LAST_VIRTUAL_REGISTER + 1));
> + seq = get_insns ();
> + end_sequence ();
> +
> + cost = seq_cost (seq, speed);
> + if (!cost)
> + cost = 1;
> +
> + if (dump_file && (dump_flags & TDF_DETAILS))
> + fprintf (dump_file, "Conversion from %s to %s costs %d\n",
> + GET_MODE_NAME (mode_to), GET_MODE_NAME (mode_from), cost);
> +
> + costs[mode_to][mode_from][speed] = cost;
> + return cost;
> +}
> +
> +/* Returns cost of negation in MODE. */
> +
> +unsigned
> +negate_reg_cost (enum machine_mode mode, bool speed)
> +{
> + static unsigned costs[NUM_MACHINE_MODES][2];
> + rtx seq;
> + unsigned cost;
> +
> + if (speed)
> + speed = 1;
> +
> + if (costs[mode][speed])
> + return costs[mode][speed];
> +
> + start_sequence ();
> + force_operand (gen_rtx_fmt_e (NEG, mode,
> + gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1)),
> + NULL_RTX);
> + seq = get_insns ();
> + end_sequence ();
> +
> + cost = seq_cost (seq, speed);
> + if (!cost)
> + cost = 1;
> +
> + costs[mode][speed] = cost;
> +
> + if (dump_file && (dump_flags & TDF_DETAILS))
> + fprintf (dump_file, "Negation in %s costs %d\n",
> + GET_MODE_NAME (mode), cost);
> + return cost;
> +}
> +
> /* Entry in a hashtable of already known costs for multiplication. */
> struct mbc_entry
> {
> @@ -3120,19 +3281,20 @@ mbc_entry_eq (const void *entry1, const void *entr
> /* Returns cost of multiplication by constant CST in MODE. */
>
> unsigned
> -multiply_by_cost (HOST_WIDE_INT cst, enum machine_mode mode, bool speed)
> +multiply_by_const_cost (HOST_WIDE_INT cst, enum machine_mode mode, bool
> speed)
> {
> - static htab_t costs;
> struct mbc_entry **cached, act;
> rtx seq;
> unsigned cost;
>
> - if (!costs)
> - costs = htab_create (100, mbc_entry_hash, mbc_entry_eq, free);
> + if (speed)
> + speed = 1;
>
> act.mode = mode;
> act.cst = cst;
> - cached = (struct mbc_entry **) htab_find_slot (costs, &act, INSERT);
> + cached = (struct mbc_entry **)
> + htab_find_slot (mult_costs[speed], &act, INSERT);
> +
> if (*cached)
> return (*cached)->cost;
>
> @@ -3418,7 +3580,7 @@ get_address_cost (bool symbol_present, bool var_pr
> If VAR_PRESENT is true, try whether the mode with
> SYMBOL_PRESENT = false is cheaper even with cost of addition, and
> if this is the case, use it. */
> - add_c = add_cost (address_mode, speed);
> + add_c = add_regs_cost (address_mode, speed);
> for (i = 0; i < 8; i++)
> {
> var_p = i & 1;
> @@ -3499,10 +3661,10 @@ get_address_cost (bool symbol_present, bool var_pr
> && multiplier_allowed_in_address_p (ratio, mem_mode, as));
>
> if (ratio != 1 && !ratio_p)
> - cost += multiply_by_cost (ratio, address_mode, speed);
> + cost += multiply_by_const_cost (ratio, address_mode, speed);
>
> if (s_offset && !offset_p && !symbol_present)
> - cost += add_cost (address_mode, speed);
> + cost += add_regs_cost (address_mode, speed);
>
> if (may_autoinc)
> *may_autoinc = autoinc;
> @@ -3601,7 +3763,7 @@ force_expr_to_var_cost (tree expr, bool speed)
> STRIP_NOPS (expr);
>
> if (SSA_VAR_P (expr))
> - return zero_cost;
> + return no_cost;
>
> if (is_gimple_min_invariant (expr))
> {
> @@ -3633,12 +3795,12 @@ force_expr_to_var_cost (tree expr, bool speed)
> STRIP_NOPS (op1);
>
> if (is_gimple_val (op0))
> - cost0 = zero_cost;
> + cost0 = no_cost;
> else
> cost0 = force_expr_to_var_cost (op0, speed);
>
> if (is_gimple_val (op1))
> - cost1 = zero_cost;
> + cost1 = no_cost;
> else
> cost1 = force_expr_to_var_cost (op1, speed);
>
> @@ -3650,11 +3812,11 @@ force_expr_to_var_cost (tree expr, bool speed)
> op1 = NULL_TREE;
>
> if (is_gimple_val (op0))
> - cost0 = zero_cost;
> + cost0 = no_cost;
> else
> cost0 = force_expr_to_var_cost (op0, speed);
>
> - cost1 = zero_cost;
> + cost1 = no_cost;
> break;
>
> default:
> @@ -3669,7 +3831,7 @@ force_expr_to_var_cost (tree expr, bool speed)
> case PLUS_EXPR:
> case MINUS_EXPR:
> case NEGATE_EXPR:
> - cost = new_cost (add_cost (mode, speed), 0);
> + cost = new_cost (add_regs_cost (mode, speed), 0);
> if (TREE_CODE (expr) != NEGATE_EXPR)
> {
> tree mult = NULL_TREE;
> @@ -3689,9 +3851,11 @@ force_expr_to_var_cost (tree expr, bool speed)
>
> case MULT_EXPR:
> if (cst_and_fits_in_hwi (op0))
> - cost = new_cost (multiply_by_cost (int_cst_value (op0), mode, speed),
> 0);
> + cost = new_cost (multiply_by_const_cost (int_cst_value (op0),
> + mode, speed), 0);
> else if (cst_and_fits_in_hwi (op1))
> - cost = new_cost (multiply_by_cost (int_cst_value (op1), mode, speed),
> 0);
> + cost = new_cost (multiply_by_const_cost (int_cst_value (op1),
> + mode, speed), 0);
> else
> return new_cost (target_spill_cost [speed], 0);
> break;
> @@ -3766,12 +3930,12 @@ split_address_cost (struct ivopts_data *data,
> {
> *symbol_present = true;
> *var_present = false;
> - return zero_cost;
> + return no_cost;
> }
>
> *symbol_present = false;
> *var_present = true;
> - return zero_cost;
> + return no_cost;
> }
>
> /* Estimates cost of expressing difference of addresses E1 - E2 as
> @@ -3796,7 +3960,7 @@ ptr_difference_cost (struct ivopts_data *data,
> *offset += diff;
> *symbol_present = false;
> *var_present = false;
> - return zero_cost;
> + return no_cost;
> }
>
> if (integer_zerop (e2))
> @@ -3846,7 +4010,7 @@ difference_cost (struct ivopts_data *data,
> if (operand_equal_p (e1, e2, 0))
> {
> *var_present = false;
> - return zero_cost;
> + return no_cost;
> }
>
> *var_present = true;
> @@ -3857,7 +4021,7 @@ difference_cost (struct ivopts_data *data,
> if (integer_zerop (e1))
> {
> comp_cost cost = force_var_cost (data, e2, depends_on);
> - cost.cost += multiply_by_cost (-1, mode, data->speed);
> + cost.cost += multiply_by_const_cost (-1, mode, data->speed);
> return cost;
> }
>
> @@ -4168,7 +4332,7 @@ get_computation_cost_at (struct ivopts_data *data,
> &symbol_present, &var_present,
> &offset, depends_on));
> cost.cost /= avg_loop_niter (data->current_loop);
> - cost.cost += add_cost (TYPE_MODE (ctype), data->speed);
> + cost.cost += add_regs_cost (TYPE_MODE (ctype), data->speed);
> }
>
> if (inv_expr_id)
> @@ -4201,7 +4365,7 @@ get_computation_cost_at (struct ivopts_data *data,
> if (!symbol_present && !var_present && !offset)
> {
> if (ratio != 1)
> - cost.cost += multiply_by_cost (ratio, TYPE_MODE (ctype), speed);
> + cost.cost += multiply_by_const_cost (ratio, TYPE_MODE (ctype), speed);
> return cost;
> }
>
> @@ -4209,18 +4373,18 @@ get_computation_cost_at (struct ivopts_data *data,
> are added once to the variable, if present. */
> if (var_present && (symbol_present || offset))
> cost.cost += adjust_setup_cost (data,
> - add_cost (TYPE_MODE (ctype), speed));
> + add_regs_cost (TYPE_MODE (ctype), speed));
>
> /* Having offset does not affect runtime cost in case it is added to
> symbol, but it increases complexity. */
> if (offset)
> cost.complexity++;
>
> - cost.cost += add_cost (TYPE_MODE (ctype), speed);
> + cost.cost += add_regs_cost (TYPE_MODE (ctype), speed);
>
> aratio = ratio > 0 ? ratio : -ratio;
> if (aratio != 1)
> - cost.cost += multiply_by_cost (aratio, TYPE_MODE (ctype), speed);
> + cost.cost += multiply_by_const_cost (aratio, TYPE_MODE (ctype), speed);
> return cost;
>
> fallback:
> @@ -4277,7 +4441,7 @@ determine_use_iv_cost_generic (struct ivopts_data
> if (cand->pos == IP_ORIGINAL
> && cand->incremented_at == use->stmt)
> {
> - set_use_iv_cost (data, use, cand, zero_cost, NULL, NULL_TREE,
> + set_use_iv_cost (data, use, cand, no_cost, NULL, NULL_TREE,
> ERROR_MARK, -1);
> return true;
> }
> @@ -5066,7 +5230,7 @@ determine_iv_cost (struct ivopts_data *data, struc
> or a const set. */
> if (cost_base.cost == 0)
> cost_base.cost = COSTS_N_INSNS (1);
> - cost_step = add_cost (TYPE_MODE (TREE_TYPE (base)), data->speed);
> + cost_step = add_regs_cost (TYPE_MODE (TREE_TYPE (base)), data->speed);
>
> cost = cost_step + adjust_setup_cost (data, cost_base.cost);
>
> @@ -5561,10 +5725,10 @@ iv_ca_new (struct ivopts_data *data)
> nw->cands = BITMAP_ALLOC (NULL);
> nw->n_cands = 0;
> nw->n_regs = 0;
> - nw->cand_use_cost = zero_cost;
> + nw->cand_use_cost = no_cost;
> nw->cand_cost = 0;
> nw->n_invariant_uses = XCNEWVEC (unsigned, data->max_inv_id + 1);
> - nw->cost = zero_cost;
> + nw->cost = no_cost;
> nw->used_inv_expr = XCNEWVEC (unsigned, data->inv_expr_id + 1);
> nw->num_used_inv_expr = 0;
>
> @@ -6638,6 +6802,8 @@ tree_ssa_iv_optimize_finalize (struct ivopts_data
> VEC_free (iv_use_p, heap, data->iv_uses);
> VEC_free (iv_cand_p, heap, data->iv_candidates);
> htab_delete (data->inv_expr_tab);
> + htab_delete (mult_costs[0]);
> + htab_delete (mult_costs[1]);
> }
>
> /* Returns true if the loop body BODY includes any function calls. */
> Index: gcc/tree-ssa-address.c
> ===================================================================
> --- gcc/tree-ssa-address.c (revision 188839)
> +++ gcc/tree-ssa-address.c (working copy)
> @@ -556,7 +556,7 @@ most_expensive_mult_to_index (tree type, struct me
> || !multiplier_allowed_in_address_p (coef, TYPE_MODE (type), as))
> continue;
>
> - acost = multiply_by_cost (coef, address_mode, speed);
> + acost = multiply_by_const_cost (coef, address_mode, speed);
>
> if (acost > best_mult_cost)
> {
> Index: gcc/tree-flow.h
> ===================================================================
> --- gcc/tree-flow.h (revision 188839)
> +++ gcc/tree-flow.h (working copy)
> @@ -810,7 +810,12 @@ bool expr_invariant_in_loop_p (struct loop *, tree
> bool stmt_invariant_in_loop_p (struct loop *, gimple);
> bool multiplier_allowed_in_address_p (HOST_WIDE_INT, enum machine_mode,
> addr_space_t);
> -unsigned multiply_by_cost (HOST_WIDE_INT, enum machine_mode, bool);
> +unsigned multiply_by_const_cost (HOST_WIDE_INT, enum machine_mode, bool);
> +unsigned add_regs_cost (enum machine_mode, bool);
> +unsigned multiply_regs_cost (enum machine_mode, bool);
> +unsigned add_const_cost (enum machine_mode, bool);
> +unsigned extend_or_trunc_reg_cost (tree, tree, bool);
> +unsigned negate_reg_cost (enum machine_mode, bool);
> bool may_be_nonaddressable_p (tree expr);
>
> /* In tree-ssa-threadupdate.c. */
>
>
>
--
Richard Guenther <rguent...@suse.de>
SUSE / SUSE Labs
SUSE LINUX Products GmbH - Nuernberg - AG Nuernberg - HRB 16746
GF: Jeff Hawn, Jennifer Guild, Felix Imend
