/* Transformations based on profile information for values.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "recog.h"
#include "optabs.h"
#include "regs.h"
-
-/* In this file value profile based optimizations will be placed (none are
- here just now, but they are hopefully coming soon).
+#include "ggc.h"
+#include "tree-flow.h"
+#include "tree-flow-inline.h"
+#include "diagnostic.h"
+#include "coverage.h"
+#include "tree.h"
+#include "gcov-io.h"
+#include "timevar.h"
+#include "tree-pass.h"
+#include "toplev.h"
+
+static struct value_prof_hooks *value_prof_hooks;
+
+/* In this file value profile based optimizations are placed. Currently the
+ following optimizations are implemented (for more detailed descriptions
+ see comments at value_profile_transformations):
+
+ 1) Division/modulo specialization. Provided that we can determine that the
+ operands of the division have some special properties, we may use it to
+ produce more effective code.
+ 2) Speculative prefetching. If we are able to determine that the difference
+ between addresses accessed by a memory reference is usually constant, we
+ may add the prefetch instructions.
+ FIXME: This transformation was removed together with RTL based value
+ profiling.
Every such optimization should add its requirements for profiled values to
insn_values_to_profile function. This function is called from branch_prob
in profile.c and the requested values are instrumented by it in the first
compilation with -fprofile-arcs. The optimization may then read the
gathered data in the second compilation with -fbranch-probabilities.
- The measured data is appended as REG_VALUE_PROFILE note to the instrumented
- insn. The argument to the note consists of an EXPR_LIST where its
- members have the following meaning (from the first to the last):
-
- -- type of information gathered (HIST_TYPE*)
- -- the expression that is profiled
- -- list of counters starting from the first one. */
-
-static void insn_divmod_values_to_profile (rtx, unsigned *,
- struct histogram_value **);
-static void insn_values_to_profile (rtx, unsigned *, struct histogram_value **);
-static rtx gen_divmod_fixed_value (enum machine_mode, enum rtx_code, rtx, rtx,
- rtx, gcov_type);
-static rtx gen_mod_pow2 (enum machine_mode, enum rtx_code, rtx, rtx, rtx);
-static rtx gen_mod_subtract (enum machine_mode, enum rtx_code, rtx, rtx, rtx,
- int);
-static bool divmod_fixed_value_transform (rtx insn);
-static bool mod_pow2_value_transform (rtx);
-static bool mod_subtract_transform (rtx);
-\f
-/* Release the list of VALUES of length N_VALUES for that we want to measure
- histograms. */
-void
-free_profiled_values (unsigned n_values ATTRIBUTE_UNUSED,
- struct histogram_value *values)
-{
- free (values);
-}
-
-/* Find values inside INSN for that we want to measure histograms for
- division/modulo optimization. */
-static void
-insn_divmod_values_to_profile (rtx insn, unsigned *n_values,
- struct histogram_value **values)
-{
- rtx set, set_src, op1, op2;
- enum machine_mode mode;
-
- if (!INSN_P (insn))
- return;
-
- set = single_set (insn);
- if (!set)
- return;
-
- mode = GET_MODE (SET_DEST (set));
- if (!INTEGRAL_MODE_P (mode))
- return;
-
- set_src = SET_SRC (set);
- switch (GET_CODE (set_src))
- {
- case DIV:
- case MOD:
- case UDIV:
- case UMOD:
- op1 = XEXP (set_src, 0);
- op2 = XEXP (set_src, 1);
- if (side_effects_p (op2))
- return;
-
- /* Check for a special case where the divisor is power of 2. */
- if ((GET_CODE (set_src) == UMOD) && !CONSTANT_P (op2))
- {
- *values = xrealloc (*values,
- (*n_values + 1)
- * sizeof (struct histogram_value));
- (*values)[*n_values].value = op2;
- (*values)[*n_values].seq = NULL_RTX;
- (*values)[*n_values].mode = mode;
- (*values)[*n_values].insn = insn;
- (*values)[*n_values].type = HIST_TYPE_POW2;
- (*values)[*n_values].hdata.pow2.may_be_other = 1;
- (*n_values)++;
- }
-
- /* Check whether the divisor is not in fact a constant. */
- if (!CONSTANT_P (op2))
- {
- *values = xrealloc (*values,
- (*n_values + 1)
- * sizeof (struct histogram_value));
- (*values)[*n_values].value = op2;
- (*values)[*n_values].mode = mode;
- (*values)[*n_values].seq = NULL_RTX;
- (*values)[*n_values].insn = insn;
- (*values)[*n_values].type = HIST_TYPE_SINGLE_VALUE;
- (*n_values)++;
- }
- /* For mod, check whether it is not often a noop (or replacable by
- a few subtractions). */
- if (GET_CODE (set_src) == UMOD && !side_effects_p (op1))
- {
- rtx tmp;
-
- *values = xrealloc (*values,
- (*n_values + 1)
- * sizeof (struct histogram_value));
- start_sequence ();
- tmp = simplify_gen_binary (DIV, mode, copy_rtx (op1), copy_rtx (op2));
- (*values)[*n_values].value = force_operand (tmp, NULL_RTX);
- (*values)[*n_values].seq = get_insns ();
- end_sequence ();
- (*values)[*n_values].mode = mode;
- (*values)[*n_values].insn = insn;
- (*values)[*n_values].type = HIST_TYPE_INTERVAL;
- (*values)[*n_values].hdata.intvl.int_start = 0;
- (*values)[*n_values].hdata.intvl.steps = 2;
- (*values)[*n_values].hdata.intvl.may_be_less = 1;
- (*values)[*n_values].hdata.intvl.may_be_more = 1;
- (*n_values)++;
- }
- return;
+ The measured data is pointed to from the histograms
+ field of the statement annotation of the instrumented insns. It is
+ kept as a linked list of struct histogram_value_t's, which contain the
+ same information as above. */
- default:
- return;
- }
-}
-/* Find values inside INSN for that we want to measure histograms and adds
- them to list VALUES (increasing the record of its length in N_VALUES). */
-static void
-insn_values_to_profile (rtx insn,
- unsigned *n_values,
- struct histogram_value **values)
-{
- if (flag_value_profile_transformations)
- insn_divmod_values_to_profile (insn, n_values, values);
-}
+static tree tree_divmod_fixed_value (tree, tree, tree, tree,
+ tree, int, gcov_type, gcov_type);
+static tree tree_mod_pow2 (tree, tree, tree, tree, int, gcov_type, gcov_type);
+static tree tree_mod_subtract (tree, tree, tree, tree, int, int, int,
+ gcov_type, gcov_type, gcov_type);
+static bool tree_divmod_fixed_value_transform (tree);
+static bool tree_mod_pow2_value_transform (tree);
+static bool tree_mod_subtract_transform (tree);
-/* Find list of values for that we want to measure histograms. */
-void
-find_values_to_profile (unsigned *n_values, struct histogram_value **values)
+/* The overall number of invocations of the counter should match execution count
+ of basic block. Report it as error rather than internal error as it might
+ mean that user has misused the profile somehow. */
+static bool
+check_counter (tree stmt, const char * name, gcov_type all, gcov_type bb_count)
{
- rtx insn;
- unsigned i;
-
- *n_values = 0;
- *values = NULL;
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
- insn_values_to_profile (insn, n_values, values);
-
- for (i = 0; i < *n_values; i++)
+ if (all != bb_count)
{
- switch ((*values)[i].type)
- {
- case HIST_TYPE_INTERVAL:
- if (rtl_dump_file)
- fprintf (rtl_dump_file,
- "Interval counter for insn %d, range %d -- %d.\n",
- INSN_UID ((*values)[i].insn),
- (*values)[i].hdata.intvl.int_start,
- ((*values)[i].hdata.intvl.int_start
- + (*values)[i].hdata.intvl.steps - 1));
- (*values)[i].n_counters = (*values)[i].hdata.intvl.steps +
- ((*values)[i].hdata.intvl.may_be_less ? 1 : 0) +
- ((*values)[i].hdata.intvl.may_be_more ? 1 : 0);
- break;
-
- case HIST_TYPE_POW2:
- if (rtl_dump_file)
- fprintf (rtl_dump_file,
- "Pow2 counter for insn %d.\n",
- INSN_UID ((*values)[i].insn));
- (*values)[i].n_counters = GET_MODE_BITSIZE ((*values)[i].mode) +
- ((*values)[i].hdata.pow2.may_be_other ? 1 : 0);
- break;
-
- case HIST_TYPE_SINGLE_VALUE:
- if (rtl_dump_file)
- fprintf (rtl_dump_file,
- "Single value counter for insn %d.\n",
- INSN_UID ((*values)[i].insn));
- (*values)[i].n_counters = 3;
- break;
-
- case HIST_TYPE_CONST_DELTA:
- if (rtl_dump_file)
- fprintf (rtl_dump_file,
- "Constant delta counter for insn %d.\n",
- INSN_UID ((*values)[i].insn));
- (*values)[i].n_counters = 4;
- break;
-
- default:
- abort ();
- }
+ location_t * locus;
+ locus = (stmt != NULL && EXPR_HAS_LOCATION (stmt)
+ ? EXPR_LOCUS (stmt)
+ : &DECL_SOURCE_LOCATION (current_function_decl));
+ error ("%HCorrupted value profile: %s profiler overall count (%d) does not match BB count (%d)",
+ locus, name, (int)all, (int)bb_count);
+ return true;
}
+ return false;
}
-/* Main entry point. Finds REG_VALUE_PROFILE notes from profiler and uses
- them to identify and exploit properties of values that are hard to analyze
- statically.
-
- We do following transformations:
-
- 1)
-
- x = a / b;
-
- where b is almost always a constant N is transformed to
-
- if (b == N)
- x = a / N;
- else
- x = a / b;
-
- Analogically with %
-
- 2)
-
- x = a % b
-
- where b is almost always a power of 2 and the division is unsigned
- TODO -- handle signed case as well
-
- if ((b & (b - 1)) == 0)
- x = a & (b - 1);
- else
- x = x % b;
-
- Note that when b = 0, no error will occur and x = a; this is correct,
- as result of such operation is undefined.
-
- 3)
-
- x = a % b
-
- where a is almost always less then b and the division is unsigned
- TODO -- handle signed case as well
-
- x = a;
- if (x >= b)
- x %= b;
-
- 4)
-
- x = a % b
-
- where a is almost always less then 2 * b and the division is unsigned
- TODO -- handle signed case as well
-
- x = a;
- if (x >= b)
- x -= b;
- if (x >= b)
- x %= b;
-
- It would be possible to continue analogically for K * b for other small
- K's, but it is probably not useful.
-
- TODO:
-
- There are other useful cases that could be handled by a similar mechanism,
- for example:
-
- for (i = 0; i < n; i++)
- ...
-
- transform to (for constant N):
-
- if (n == N)
- for (i = 0; i < N; i++)
- ...
- else
- for (i = 0; i < n; i++)
- ...
- making unroller happy. Since this may grow the code significantly,
- we would have to be very careful here. */
-
-bool
-value_profile_transformations (void)
+/* Tree based transformations. */
+static bool
+tree_value_profile_transformations (void)
{
- rtx insn, next;
- int changed = false;
+ basic_block bb;
+ block_stmt_iterator bsi;
+ bool changed = false;
- for (insn = get_insns (); insn; insn = next)
+ FOR_EACH_BB (bb)
{
- next = NEXT_INSN (insn);
-
- if (!INSN_P (insn))
- continue;
-
- /* Scan for insn carrying a histogram. */
- if (!find_reg_note (insn, REG_VALUE_PROFILE, 0))
+ /* Ignore cold areas -- we are enlarging the code. */
+ if (!maybe_hot_bb_p (bb))
continue;
- /* Ignore cold areas -- we are growing a code. */
- if (!maybe_hot_bb_p (BLOCK_FOR_INSN (insn)))
- continue;
-
- if (rtl_dump_file)
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
{
- fprintf (rtl_dump_file, "Trying transformations on insn %d\n",
- INSN_UID (insn));
- print_rtl_single (rtl_dump_file, insn);
- }
-
- /* Transformations: */
- if (flag_value_profile_transformations
- && (mod_subtract_transform (insn)
- || divmod_fixed_value_transform (insn)
- || mod_pow2_value_transform (insn)))
- changed = true;
+ tree stmt = bsi_stmt (bsi);
+ stmt_ann_t ann = get_stmt_ann (stmt);
+ histogram_value th = ann->histograms;
+ if (!th)
+ continue;
+
+ if (dump_file)
+ {
+ fprintf (dump_file, "Trying transformations on insn ");
+ print_generic_stmt (dump_file, stmt, TDF_SLIM);
+ }
+
+ /* Transformations: */
+ /* The order of things in this conditional controls which
+ transformation is used when more than one is applicable. */
+ /* It is expected that any code added by the transformations
+ will be added before the current statement, and that the
+ current statement remain valid (although possibly
+ modified) upon return. */
+ if (flag_value_profile_transformations
+ && (tree_mod_subtract_transform (stmt)
+ || tree_divmod_fixed_value_transform (stmt)
+ || tree_mod_pow2_value_transform (stmt)))
+ {
+ changed = true;
+ /* Original statement may no longer be in the same block. */
+ if (bb != bb_for_stmt (stmt))
+ {
+ bb = bb_for_stmt (stmt);
+ bsi = bsi_for_stmt (stmt);
+ }
+ }
+
+ /* Free extra storage from compute_value_histograms. */
+ while (th)
+ {
+ free (th->hvalue.counters);
+ th = th->hvalue.next;
+ }
+ ann->histograms = 0;
+ }
}
if (changed)
{
- commit_edge_insertions ();
- allocate_reg_info (max_reg_num (), FALSE, FALSE);
+ counts_to_freqs ();
}
return changed;
}
-/* Generate code for transformation 1 (with MODE and OPERATION, operands OP1
- and OP2 whose value is expected to be VALUE and result TARGET). */
-static rtx
-gen_divmod_fixed_value (enum machine_mode mode, enum rtx_code operation,
- rtx target, rtx op1, rtx op2, gcov_type value)
+/* Generate code for transformation 1 (with OPERATION, operands OP1
+ and OP2, whose value is expected to be VALUE, parent modify-expr STMT and
+ probability of taking the optimal path PROB, which is equivalent to COUNT/ALL
+ within roundoff error). This generates the result into a temp and returns
+ the temp; it does not replace or alter the original STMT. */
+static tree
+tree_divmod_fixed_value (tree stmt, tree operation,
+ tree op1, tree op2, tree value, int prob, gcov_type count,
+ gcov_type all)
{
- rtx tmp, tmp1;
- rtx neq_label = gen_label_rtx ();
- rtx end_label = gen_label_rtx ();
- rtx sequence;
-
- start_sequence ();
-
- if (!REG_P (op2))
- {
- tmp = gen_reg_rtx (mode);
- emit_move_insn (tmp, copy_rtx (op2));
- }
- else
- tmp = op2;
-
- do_compare_rtx_and_jump (tmp, GEN_INT (value), NE, 0, mode, NULL_RTX,
- NULL_RTX, neq_label);
- tmp1 = simplify_gen_binary (operation, mode, copy_rtx (op1), GEN_INT (value));
- tmp1 = force_operand (tmp1, target);
- if (tmp1 != target)
- emit_move_insn (copy_rtx (target), copy_rtx (tmp1));
-
- emit_jump_insn (gen_jump (end_label));
- emit_barrier ();
-
- emit_label (neq_label);
- tmp1 = simplify_gen_binary (operation, mode, copy_rtx (op1), copy_rtx (tmp));
- tmp1 = force_operand (tmp1, target);
- if (tmp1 != target)
- emit_move_insn (copy_rtx (target), copy_rtx (tmp1));
+ tree stmt1, stmt2, stmt3;
+ tree tmp1, tmp2, tmpv;
+ tree label_decl1 = create_artificial_label ();
+ tree label_decl2 = create_artificial_label ();
+ tree label_decl3 = create_artificial_label ();
+ tree label1, label2, label3;
+ tree bb1end, bb2end, bb3end;
+ basic_block bb, bb2, bb3, bb4;
+ tree optype = TREE_TYPE (operation);
+ edge e12, e13, e23, e24, e34;
+ block_stmt_iterator bsi;
+
+ bb = bb_for_stmt (stmt);
+ bsi = bsi_for_stmt (stmt);
+
+ tmpv = create_tmp_var (optype, "PROF");
+ tmp1 = create_tmp_var (optype, "PROF");
+ stmt1 = build2 (MODIFY_EXPR, optype, tmpv, fold_convert (optype, value));
+ stmt2 = build2 (MODIFY_EXPR, optype, tmp1, op2);
+ stmt3 = build3 (COND_EXPR, void_type_node,
+ build2 (NE_EXPR, boolean_type_node, tmp1, tmpv),
+ build1 (GOTO_EXPR, void_type_node, label_decl2),
+ build1 (GOTO_EXPR, void_type_node, label_decl1));
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt3, BSI_SAME_STMT);
+ bb1end = stmt3;
+
+ tmp2 = create_tmp_var (optype, "PROF");
+ label1 = build1 (LABEL_EXPR, void_type_node, label_decl1);
+ stmt1 = build2 (MODIFY_EXPR, optype, tmp2,
+ build2 (TREE_CODE (operation), optype, op1, tmpv));
+ bsi_insert_before (&bsi, label1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bb2end = stmt1;
+
+ label2 = build1 (LABEL_EXPR, void_type_node, label_decl2);
+ stmt1 = build2 (MODIFY_EXPR, optype, tmp2,
+ build2 (TREE_CODE (operation), optype, op1, op2));
+ bsi_insert_before (&bsi, label2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bb3end = stmt1;
+
+ label3 = build1 (LABEL_EXPR, void_type_node, label_decl3);
+ bsi_insert_before (&bsi, label3, BSI_SAME_STMT);
+
+ /* Fix CFG. */
+ /* Edge e23 connects bb2 to bb3, etc. */
+ e12 = split_block (bb, bb1end);
+ bb2 = e12->dest;
+ bb2->count = count;
+ e23 = split_block (bb2, bb2end);
+ bb3 = e23->dest;
+ bb3->count = all - count;
+ e34 = split_block (bb3, bb3end);
+ bb4 = e34->dest;
+ bb4->count = all;
+
+ e12->flags &= ~EDGE_FALLTHRU;
+ e12->flags |= EDGE_FALSE_VALUE;
+ e12->probability = prob;
+ e12->count = count;
+
+ e13 = make_edge (bb, bb3, EDGE_TRUE_VALUE);
+ e13->probability = REG_BR_PROB_BASE - prob;
+ e13->count = all - count;
+
+ remove_edge (e23);
- emit_label (end_label);
+ e24 = make_edge (bb2, bb4, EDGE_FALLTHRU);
+ e24->probability = REG_BR_PROB_BASE;
+ e24->count = count;
- sequence = get_insns ();
- end_sequence ();
- rebuild_jump_labels (sequence);
- return sequence;
+ e34->probability = REG_BR_PROB_BASE;
+ e34->count = all - count;
+
+ return tmp2;
}
/* Do transform 1) on INSN if applicable. */
static bool
-divmod_fixed_value_transform (rtx insn)
+tree_divmod_fixed_value_transform (tree stmt)
{
- rtx set, set_src, set_dest, op1, op2, value, histogram;
- enum rtx_code code;
- enum machine_mode mode;
+ stmt_ann_t ann = get_stmt_ann (stmt);
+ histogram_value histogram;
+ enum tree_code code;
gcov_type val, count, all;
- edge e;
-
- set = single_set (insn);
- if (!set)
+ tree modify, op, op1, op2, result, value, tree_val;
+ int prob;
+
+ modify = stmt;
+ if (TREE_CODE (stmt) == RETURN_EXPR
+ && TREE_OPERAND (stmt, 0)
+ && TREE_CODE (TREE_OPERAND (stmt, 0)) == MODIFY_EXPR)
+ modify = TREE_OPERAND (stmt, 0);
+ if (TREE_CODE (modify) != MODIFY_EXPR)
return false;
-
- set_src = SET_SRC (set);
- set_dest = SET_DEST (set);
- code = GET_CODE (set_src);
- mode = GET_MODE (set_dest);
+ op = TREE_OPERAND (modify, 1);
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (op)))
+ return false;
+ code = TREE_CODE (op);
- if (code != DIV && code != MOD && code != UDIV && code != UMOD)
+ if (code != TRUNC_DIV_EXPR && code != TRUNC_MOD_EXPR)
return false;
- op1 = XEXP (set_src, false);
- op2 = XEXP (set_src, 1);
-
- for (histogram = REG_NOTES (insn);
- histogram;
- histogram = XEXP (histogram, 1))
- if (REG_NOTE_KIND (histogram) == REG_VALUE_PROFILE
- && XEXP (XEXP (histogram, 0), 0) == GEN_INT (HIST_TYPE_SINGLE_VALUE))
+
+ op1 = TREE_OPERAND (op, 0);
+ op2 = TREE_OPERAND (op, 1);
+ if (!ann->histograms)
+ return false;
+
+ for (histogram = ann->histograms; histogram; histogram = histogram->hvalue.next)
+ if (histogram->type == HIST_TYPE_SINGLE_VALUE)
break;
if (!histogram)
return false;
- histogram = XEXP (XEXP (histogram, 0), 1);
- value = XEXP (histogram, 0);
- histogram = XEXP (histogram, 1);
- val = INTVAL (XEXP (histogram, 0));
- histogram = XEXP (histogram, 1);
- count = INTVAL (XEXP (histogram, 0));
- histogram = XEXP (histogram, 1);
- all = INTVAL (XEXP (histogram, 0));
+ value = histogram->hvalue.value;
+ val = histogram->hvalue.counters[0];
+ count = histogram->hvalue.counters[1];
+ all = histogram->hvalue.counters[2];
- /* We requiere that count is at least half of all; this means
+ /* We require that count is at least half of all; this means
that for the transformation to fire the value must be constant
- at least 50% of time (and 75% gives the garantee of usage). */
- if (!rtx_equal_p (op2, value) || 2 * count < all)
+ at least 50% of time (and 75% gives the guarantee of usage). */
+ if (simple_cst_equal (op2, value) != 1 || 2 * count < all)
return false;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Div/mod by constant transformation on insn %d\n",
- INSN_UID (insn));
+ if (check_counter (stmt, "value", all, bb_for_stmt (stmt)->count))
+ return false;
- e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
- delete_insn (insn);
-
- insert_insn_on_edge (
- gen_divmod_fixed_value (mode, code, set_dest, op1, op2, val), e);
+ /* Compute probability of taking the optimal path. */
+ prob = (count * REG_BR_PROB_BASE + all / 2) / all;
+
+ tree_val = build_int_cst_wide (get_gcov_type (),
+ (unsigned HOST_WIDE_INT) val,
+ val >> (HOST_BITS_PER_WIDE_INT - 1) >> 1);
+ result = tree_divmod_fixed_value (stmt, op, op1, op2, tree_val, prob, count, all);
+
+ if (dump_file)
+ {
+ fprintf (dump_file, "Div/mod by constant ");
+ print_generic_expr (dump_file, value, TDF_SLIM);
+ fprintf (dump_file, "=");
+ print_generic_expr (dump_file, tree_val, TDF_SLIM);
+ fprintf (dump_file, " transformation on insn ");
+ print_generic_stmt (dump_file, stmt, TDF_SLIM);
+ }
+
+ TREE_OPERAND (modify, 1) = result;
return true;
}
-/* Generate code for transformation 2 (with MODE and OPERATION, operands OP1
- and OP2 and result TARGET). */
-static rtx
-gen_mod_pow2 (enum machine_mode mode, enum rtx_code operation, rtx target,
- rtx op1, rtx op2)
+/* Generate code for transformation 2 (with OPERATION, operands OP1
+ and OP2, parent modify-expr STMT and probability of taking the optimal
+ path PROB, which is equivalent to COUNT/ALL within roundoff error).
+ This generates the result into a temp and returns
+ the temp; it does not replace or alter the original STMT. */
+static tree
+tree_mod_pow2 (tree stmt, tree operation, tree op1, tree op2, int prob,
+ gcov_type count, gcov_type all)
{
- rtx tmp, tmp1, tmp2, tmp3;
- rtx neq_label = gen_label_rtx ();
- rtx end_label = gen_label_rtx ();
- rtx sequence;
-
- start_sequence ();
+ tree stmt1, stmt2, stmt3, stmt4;
+ tree tmp2, tmp3;
+ tree label_decl1 = create_artificial_label ();
+ tree label_decl2 = create_artificial_label ();
+ tree label_decl3 = create_artificial_label ();
+ tree label1, label2, label3;
+ tree bb1end, bb2end, bb3end;
+ basic_block bb, bb2, bb3, bb4;
+ tree optype = TREE_TYPE (operation);
+ edge e12, e13, e23, e24, e34;
+ block_stmt_iterator bsi;
+ tree result = create_tmp_var (optype, "PROF");
+
+ bb = bb_for_stmt (stmt);
+ bsi = bsi_for_stmt (stmt);
+
+ tmp2 = create_tmp_var (optype, "PROF");
+ tmp3 = create_tmp_var (optype, "PROF");
+ stmt2 = build2 (MODIFY_EXPR, optype, tmp2,
+ build2 (PLUS_EXPR, optype, op2, build_int_cst (optype, -1)));
+ stmt3 = build2 (MODIFY_EXPR, optype, tmp3,
+ build2 (BIT_AND_EXPR, optype, tmp2, op2));
+ stmt4 = build3 (COND_EXPR, void_type_node,
+ build2 (NE_EXPR, boolean_type_node,
+ tmp3, build_int_cst (optype, 0)),
+ build1 (GOTO_EXPR, void_type_node, label_decl2),
+ build1 (GOTO_EXPR, void_type_node, label_decl1));
+ bsi_insert_before (&bsi, stmt2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt3, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt4, BSI_SAME_STMT);
+ bb1end = stmt4;
+
+ /* tmp2 == op2-1 inherited from previous block */
+ label1 = build1 (LABEL_EXPR, void_type_node, label_decl1);
+ stmt1 = build2 (MODIFY_EXPR, optype, result,
+ build2 (BIT_AND_EXPR, optype, op1, tmp2));
+ bsi_insert_before (&bsi, label1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bb2end = stmt1;
+
+ label2 = build1 (LABEL_EXPR, void_type_node, label_decl2);
+ stmt1 = build2 (MODIFY_EXPR, optype, result,
+ build2 (TREE_CODE (operation), optype, op1, op2));
+ bsi_insert_before (&bsi, label2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bb3end = stmt1;
+
+ label3 = build1 (LABEL_EXPR, void_type_node, label_decl3);
+ bsi_insert_before (&bsi, label3, BSI_SAME_STMT);
+
+ /* Fix CFG. */
+ /* Edge e23 connects bb2 to bb3, etc. */
+ e12 = split_block (bb, bb1end);
+ bb2 = e12->dest;
+ bb2->count = count;
+ e23 = split_block (bb2, bb2end);
+ bb3 = e23->dest;
+ bb3->count = all - count;
+ e34 = split_block (bb3, bb3end);
+ bb4 = e34->dest;
+ bb4->count = all;
+
+ e12->flags &= ~EDGE_FALLTHRU;
+ e12->flags |= EDGE_FALSE_VALUE;
+ e12->probability = prob;
+ e12->count = count;
+
+ e13 = make_edge (bb, bb3, EDGE_TRUE_VALUE);
+ e13->probability = REG_BR_PROB_BASE - prob;
+ e13->count = all - count;
+
+ remove_edge (e23);
- if (!REG_P (op2))
- {
- tmp = gen_reg_rtx (mode);
- emit_move_insn (tmp, copy_rtx (op2));
- }
- else
- tmp = op2;
-
- tmp1 = expand_simple_binop (mode, PLUS, tmp, constm1_rtx, NULL_RTX,
- 0, OPTAB_WIDEN);
- tmp2 = expand_simple_binop (mode, AND, tmp, tmp1, NULL_RTX,
- 0, OPTAB_WIDEN);
- do_compare_rtx_and_jump (tmp2, const0_rtx, NE, 0, mode, NULL_RTX,
- NULL_RTX, neq_label);
- tmp3 = expand_simple_binop (mode, AND, op1, tmp1, target,
- 0, OPTAB_WIDEN);
- if (tmp3 != target)
- emit_move_insn (copy_rtx (target), tmp3);
- emit_jump_insn (gen_jump (end_label));
- emit_barrier ();
-
- emit_label (neq_label);
- tmp1 = simplify_gen_binary (operation, mode, copy_rtx (op1), copy_rtx (tmp));
- tmp1 = force_operand (tmp1, target);
- if (tmp1 != target)
- emit_move_insn (target, tmp1);
-
- emit_label (end_label);
+ e24 = make_edge (bb2, bb4, EDGE_FALLTHRU);
+ e24->probability = REG_BR_PROB_BASE;
+ e24->count = count;
+
+ e34->probability = REG_BR_PROB_BASE;
+ e34->count = all - count;
- sequence = get_insns ();
- end_sequence ();
- rebuild_jump_labels (sequence);
- return sequence;
+ return result;
}
/* Do transform 2) on INSN if applicable. */
static bool
-mod_pow2_value_transform (rtx insn)
+tree_mod_pow2_value_transform (tree stmt)
{
- rtx set, set_src, set_dest, op1, op2, value, histogram;
- enum rtx_code code;
- enum machine_mode mode;
- gcov_type wrong_values, count;
- edge e;
- int i;
-
- set = single_set (insn);
- if (!set)
+ stmt_ann_t ann = get_stmt_ann (stmt);
+ histogram_value histogram;
+ enum tree_code code;
+ gcov_type count, wrong_values, all;
+ tree modify, op, op1, op2, result, value;
+ int prob;
+
+ modify = stmt;
+ if (TREE_CODE (stmt) == RETURN_EXPR
+ && TREE_OPERAND (stmt, 0)
+ && TREE_CODE (TREE_OPERAND (stmt, 0)) == MODIFY_EXPR)
+ modify = TREE_OPERAND (stmt, 0);
+ if (TREE_CODE (modify) != MODIFY_EXPR)
return false;
-
- set_src = SET_SRC (set);
- set_dest = SET_DEST (set);
- code = GET_CODE (set_src);
- mode = GET_MODE (set_dest);
+ op = TREE_OPERAND (modify, 1);
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (op)))
+ return false;
+ code = TREE_CODE (op);
- if (code != UMOD)
+ if (code != TRUNC_MOD_EXPR || !TYPE_UNSIGNED (TREE_TYPE (op)))
return false;
- op1 = XEXP (set_src, 0);
- op2 = XEXP (set_src, 1);
-
- for (histogram = REG_NOTES (insn);
- histogram;
- histogram = XEXP (histogram, 1))
- if (REG_NOTE_KIND (histogram) == REG_VALUE_PROFILE
- && XEXP (XEXP (histogram, 0), 0) == GEN_INT (HIST_TYPE_POW2))
+
+ op1 = TREE_OPERAND (op, 0);
+ op2 = TREE_OPERAND (op, 1);
+ if (!ann->histograms)
+ return false;
+
+ for (histogram = ann->histograms; histogram; histogram = histogram->hvalue.next)
+ if (histogram->type == HIST_TYPE_POW2)
break;
if (!histogram)
return false;
- histogram = XEXP (XEXP (histogram, 0), 1);
- value = XEXP (histogram, 0);
- histogram = XEXP (histogram, 1);
- wrong_values =INTVAL (XEXP (histogram, 0));
- histogram = XEXP (histogram, 1);
+ value = histogram->hvalue.value;
+ wrong_values = histogram->hvalue.counters[0];
+ count = histogram->hvalue.counters[1];
- count = 0;
- for (i = 0; i < GET_MODE_BITSIZE (mode); i++)
+ /* We require that we hit a power of 2 at least half of all evaluations. */
+ if (simple_cst_equal (op2, value) != 1 || count < wrong_values)
+ return false;
+
+ if (dump_file)
{
- count += INTVAL (XEXP (histogram, 0));
- histogram = XEXP (histogram, 1);
+ fprintf (dump_file, "Mod power of 2 transformation on insn ");
+ print_generic_stmt (dump_file, stmt, TDF_SLIM);
}
- if (!rtx_equal_p (op2, value))
+ /* Compute probability of taking the optimal path. */
+ all = count + wrong_values;
+ if (check_counter (stmt, "pow2", all, bb_for_stmt (stmt)->count))
return false;
- /* We require that we hit a power of two at least half of all evaluations. */
- if (count < wrong_values)
- return false;
+ prob = (count * REG_BR_PROB_BASE + all / 2) / all;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Mod power of 2 transformation on insn %d\n",
- INSN_UID (insn));
+ result = tree_mod_pow2 (stmt, op, op1, op2, prob, count, all);
- e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
- delete_insn (insn);
-
- insert_insn_on_edge (
- gen_mod_pow2 (mode, code, set_dest, op1, op2), e);
+ TREE_OPERAND (modify, 1) = result;
return true;
}
-/* Generate code for transformations 3 and 4 (with MODE and OPERATION,
- operands OP1 and OP2, result TARGET and at most SUB subtractions). */
-static rtx
-gen_mod_subtract (enum machine_mode mode, enum rtx_code operation,
- rtx target, rtx op1, rtx op2, int sub)
+/* Generate code for transformations 3 and 4 (with OPERATION, operands OP1
+ and OP2, parent modify-expr STMT, and NCOUNTS the number of cases to
+ support. Currently only NCOUNTS==0 or 1 is supported and this is
+ built into this interface. The probabilities of taking the optimal
+ paths are PROB1 and PROB2, which are equivalent to COUNT1/ALL and
+ COUNT2/ALL respectively within roundoff error). This generates the
+ result into a temp and returns the temp; it does not replace or alter
+ the original STMT. */
+/* FIXME: Generalize the interface to handle NCOUNTS > 1. */
+
+static tree
+tree_mod_subtract (tree stmt, tree operation, tree op1, tree op2,
+ int prob1, int prob2, int ncounts,
+ gcov_type count1, gcov_type count2, gcov_type all)
{
- rtx tmp, tmp1;
- rtx end_label = gen_label_rtx ();
- rtx sequence;
- int i;
+ tree stmt1, stmt2, stmt3;
+ tree tmp1;
+ tree label_decl1 = create_artificial_label ();
+ tree label_decl2 = create_artificial_label ();
+ tree label_decl3 = create_artificial_label ();
+ tree label1, label2, label3;
+ tree bb1end, bb2end = NULL_TREE, bb3end;
+ basic_block bb, bb2, bb3, bb4;
+ tree optype = TREE_TYPE (operation);
+ edge e12, e23 = 0, e24, e34, e14;
+ block_stmt_iterator bsi;
+ tree result = create_tmp_var (optype, "PROF");
+
+ bb = bb_for_stmt (stmt);
+ bsi = bsi_for_stmt (stmt);
+
+ tmp1 = create_tmp_var (optype, "PROF");
+ stmt1 = build2 (MODIFY_EXPR, optype, result, op1);
+ stmt2 = build2 (MODIFY_EXPR, optype, tmp1, op2);
+ stmt3 = build3 (COND_EXPR, void_type_node,
+ build2 (LT_EXPR, boolean_type_node, result, tmp1),
+ build1 (GOTO_EXPR, void_type_node, label_decl3),
+ build1 (GOTO_EXPR, void_type_node,
+ ncounts ? label_decl1 : label_decl2));
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt3, BSI_SAME_STMT);
+ bb1end = stmt3;
+
+ if (ncounts) /* Assumed to be 0 or 1 */
+ {
+ label1 = build1 (LABEL_EXPR, void_type_node, label_decl1);
+ stmt1 = build2 (MODIFY_EXPR, optype, result,
+ build2 (MINUS_EXPR, optype, result, tmp1));
+ stmt2 = build3 (COND_EXPR, void_type_node,
+ build2 (LT_EXPR, boolean_type_node, result, tmp1),
+ build1 (GOTO_EXPR, void_type_node, label_decl3),
+ build1 (GOTO_EXPR, void_type_node, label_decl2));
+ bsi_insert_before (&bsi, label1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt2, BSI_SAME_STMT);
+ bb2end = stmt2;
+ }
- start_sequence ();
-
- if (!REG_P (op2))
+ /* Fallback case. */
+ label2 = build1 (LABEL_EXPR, void_type_node, label_decl2);
+ stmt1 = build2 (MODIFY_EXPR, optype, result,
+ build2 (TREE_CODE (operation), optype, result, tmp1));
+ bsi_insert_before (&bsi, label2, BSI_SAME_STMT);
+ bsi_insert_before (&bsi, stmt1, BSI_SAME_STMT);
+ bb3end = stmt1;
+
+ label3 = build1 (LABEL_EXPR, void_type_node, label_decl3);
+ bsi_insert_before (&bsi, label3, BSI_SAME_STMT);
+
+ /* Fix CFG. */
+ /* Edge e23 connects bb2 to bb3, etc. */
+ /* However block 3 is optional; if it is not there, references
+ to 3 really refer to block 2. */
+ e12 = split_block (bb, bb1end);
+ bb2 = e12->dest;
+ bb2->count = all - count1;
+
+ if (ncounts) /* Assumed to be 0 or 1. */
{
- tmp = gen_reg_rtx (mode);
- emit_move_insn (tmp, copy_rtx (op2));
+ e23 = split_block (bb2, bb2end);
+ bb3 = e23->dest;
+ bb3->count = all - count1 - count2;
}
- else
- tmp = op2;
- emit_move_insn (target, copy_rtx (op1));
- do_compare_rtx_and_jump (target, tmp, LTU, 0, mode, NULL_RTX,
- NULL_RTX, end_label);
-
+ e34 = split_block (ncounts ? bb3 : bb2, bb3end);
+ bb4 = e34->dest;
+ bb4->count = all;
+
+ e12->flags &= ~EDGE_FALLTHRU;
+ e12->flags |= EDGE_FALSE_VALUE;
+ e12->probability = REG_BR_PROB_BASE - prob1;
+ e12->count = all - count1;
- for (i = 0; i < sub; i++)
+ e14 = make_edge (bb, bb4, EDGE_TRUE_VALUE);
+ e14->probability = prob1;
+ e14->count = count1;
+
+ if (ncounts) /* Assumed to be 0 or 1. */
{
- tmp1 = expand_simple_binop (mode, MINUS, target, tmp, target,
- 0, OPTAB_WIDEN);
- if (tmp1 != target)
- emit_move_insn (target, tmp1);
- do_compare_rtx_and_jump (target, tmp, LTU, 0, mode, NULL_RTX,
- NULL_RTX, end_label);
+ e23->flags &= ~EDGE_FALLTHRU;
+ e23->flags |= EDGE_FALSE_VALUE;
+ e23->count = all - count1 - count2;
+ e23->probability = REG_BR_PROB_BASE - prob2;
+
+ e24 = make_edge (bb2, bb4, EDGE_TRUE_VALUE);
+ e24->probability = prob2;
+ e24->count = count2;
}
- tmp1 = simplify_gen_binary (operation, mode, copy_rtx (target), copy_rtx (tmp));
- tmp1 = force_operand (tmp1, target);
- if (tmp1 != target)
- emit_move_insn (target, tmp1);
-
- emit_label (end_label);
+ e34->probability = REG_BR_PROB_BASE;
+ e34->count = all - count1 - count2;
- sequence = get_insns ();
- end_sequence ();
- rebuild_jump_labels (sequence);
- return sequence;
+ return result;
}
/* Do transforms 3) and 4) on INSN if applicable. */
static bool
-mod_subtract_transform (rtx insn)
+tree_mod_subtract_transform (tree stmt)
{
- rtx set, set_src, set_dest, op1, op2, value, histogram;
- enum rtx_code code;
- enum machine_mode mode;
- gcov_type wrong_values, counts[2], count, all;
- edge e;
- int i;
-
- set = single_set (insn);
- if (!set)
+ stmt_ann_t ann = get_stmt_ann (stmt);
+ histogram_value histogram;
+ enum tree_code code;
+ gcov_type count, wrong_values, all;
+ tree modify, op, op1, op2, result, value;
+ int prob1, prob2;
+ unsigned int i;
+
+ modify = stmt;
+ if (TREE_CODE (stmt) == RETURN_EXPR
+ && TREE_OPERAND (stmt, 0)
+ && TREE_CODE (TREE_OPERAND (stmt, 0)) == MODIFY_EXPR)
+ modify = TREE_OPERAND (stmt, 0);
+ if (TREE_CODE (modify) != MODIFY_EXPR)
return false;
-
- set_src = SET_SRC (set);
- set_dest = SET_DEST (set);
- code = GET_CODE (set_src);
- mode = GET_MODE (set_dest);
+ op = TREE_OPERAND (modify, 1);
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (op)))
+ return false;
+ code = TREE_CODE (op);
- if (code != UMOD)
+ if (code != TRUNC_MOD_EXPR || !TYPE_UNSIGNED (TREE_TYPE (op)))
+ return false;
+
+ op1 = TREE_OPERAND (op, 0);
+ op2 = TREE_OPERAND (op, 1);
+ if (!ann->histograms)
return false;
- op1 = XEXP (set_src, 0);
- op2 = XEXP (set_src, 1);
-
- for (histogram = REG_NOTES (insn);
- histogram;
- histogram = XEXP (histogram, 1))
- if (REG_NOTE_KIND (histogram) == REG_VALUE_PROFILE
- && XEXP (XEXP (histogram, 0), 0) == GEN_INT (HIST_TYPE_INTERVAL))
+
+ for (histogram = ann->histograms; histogram; histogram = histogram->hvalue.next)
+ if (histogram->type == HIST_TYPE_INTERVAL)
break;
if (!histogram)
return false;
- histogram = XEXP (XEXP (histogram, 0), 1);
- value = XEXP (histogram, 0);
- histogram = XEXP (histogram, 1);
-
+ value = histogram->hvalue.value;
all = 0;
- for (i = 0; i < 2; i++)
- {
- counts[i] = INTVAL (XEXP (histogram, 0));
- all += counts[i];
- histogram = XEXP (histogram, 1);
- }
- wrong_values = INTVAL (XEXP (histogram, 0));
- histogram = XEXP (histogram, 1);
- wrong_values += INTVAL (XEXP (histogram, 0));
+ wrong_values = 0;
+ for (i = 0; i < histogram->hdata.intvl.steps; i++)
+ all += histogram->hvalue.counters[i];
+
+ wrong_values += histogram->hvalue.counters[i];
+ wrong_values += histogram->hvalue.counters[i+1];
all += wrong_values;
+ /* Compute probability of taking the optimal path. */
+ if (check_counter (stmt, "interval", all, bb_for_stmt (stmt)->count))
+ return false;
+
/* We require that we use just subtractions in at least 50% of all
evaluations. */
count = 0;
- for (i = 0; i < 2; i++)
+ for (i = 0; i < histogram->hdata.intvl.steps; i++)
{
- count += counts[i];
+ count += histogram->hvalue.counters[i];
if (count * 2 >= all)
break;
}
-
- if (i == 2)
+ if (i == histogram->hdata.intvl.steps)
return false;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Mod subtract transformation on insn %d\n",
- INSN_UID (insn));
+ if (dump_file)
+ {
+ fprintf (dump_file, "Mod subtract transformation on insn ");
+ print_generic_stmt (dump_file, stmt, TDF_SLIM);
+ }
- e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
- delete_insn (insn);
-
- insert_insn_on_edge (
- gen_mod_subtract (mode, code, set_dest, op1, op2, i), e);
+ /* Compute probability of taking the optimal path(s). */
+ prob1 = (histogram->hvalue.counters[0] * REG_BR_PROB_BASE + all / 2) / all;
+ prob2 = (histogram->hvalue.counters[1] * REG_BR_PROB_BASE + all / 2) / all;
+
+ /* In practice, "steps" is always 2. This interface reflects this,
+ and will need to be changed if "steps" can change. */
+ result = tree_mod_subtract (stmt, op, op1, op2, prob1, prob2, i,
+ histogram->hvalue.counters[0],
+ histogram->hvalue.counters[1], all);
+
+ TREE_OPERAND (modify, 1) = result;
return true;
}
+
+struct value_prof_hooks {
+ /* Find list of values for which we want to measure histograms. */
+ void (*find_values_to_profile) (histogram_values *);
+
+ /* Identify and exploit properties of values that are hard to analyze
+ statically. See value-prof.c for more detail. */
+ bool (*value_profile_transformations) (void);
+};
+\f
+/* Find values inside STMT for that we want to measure histograms for
+ division/modulo optimization. */
+static void
+tree_divmod_values_to_profile (tree stmt, histogram_values *values)
+{
+ tree assign, lhs, rhs, divisor, op0, type;
+ histogram_value hist;
+
+ if (TREE_CODE (stmt) == RETURN_EXPR)
+ assign = TREE_OPERAND (stmt, 0);
+ else
+ assign = stmt;
+
+ if (!assign
+ || TREE_CODE (assign) != MODIFY_EXPR)
+ return;
+ lhs = TREE_OPERAND (assign, 0);
+ type = TREE_TYPE (lhs);
+ if (!INTEGRAL_TYPE_P (type))
+ return;
+
+ rhs = TREE_OPERAND (assign, 1);
+ switch (TREE_CODE (rhs))
+ {
+ case TRUNC_DIV_EXPR:
+ case TRUNC_MOD_EXPR:
+ divisor = TREE_OPERAND (rhs, 1);
+ op0 = TREE_OPERAND (rhs, 0);
+
+ VEC_reserve (histogram_value, heap, *values, 3);
+
+ if (is_gimple_reg (divisor))
+ {
+ /* Check for the case where the divisor is the same value most
+ of the time. */
+ hist = ggc_alloc (sizeof (*hist));
+ hist->hvalue.value = divisor;
+ hist->hvalue.stmt = stmt;
+ hist->type = HIST_TYPE_SINGLE_VALUE;
+ VEC_quick_push (histogram_value, *values, hist);
+ }
+
+ /* For mod, check whether it is not often a noop (or replaceable by
+ a few subtractions). */
+ if (TREE_CODE (rhs) == TRUNC_MOD_EXPR
+ && TYPE_UNSIGNED (type))
+ {
+ /* Check for a special case where the divisor is power of 2. */
+ hist = ggc_alloc (sizeof (*hist));
+ hist->hvalue.value = divisor;
+ hist->hvalue.stmt = stmt;
+ hist->type = HIST_TYPE_POW2;
+ VEC_quick_push (histogram_value, *values, hist);
+
+ hist = ggc_alloc (sizeof (*hist));
+ hist->hvalue.stmt = stmt;
+ hist->hvalue.value
+ = build2 (TRUNC_DIV_EXPR, type, op0, divisor);
+ hist->type = HIST_TYPE_INTERVAL;
+ hist->hdata.intvl.int_start = 0;
+ hist->hdata.intvl.steps = 2;
+ VEC_quick_push (histogram_value, *values, hist);
+ }
+ return;
+
+ default:
+ return;
+ }
+}
+
+/* Find values inside STMT for that we want to measure histograms and adds
+ them to list VALUES. */
+
+static void
+tree_values_to_profile (tree stmt, histogram_values *values)
+{
+ if (flag_value_profile_transformations)
+ tree_divmod_values_to_profile (stmt, values);
+}
+
+static void
+tree_find_values_to_profile (histogram_values *values)
+{
+ basic_block bb;
+ block_stmt_iterator bsi;
+ unsigned i;
+ histogram_value hist;
+
+ *values = NULL;
+ FOR_EACH_BB (bb)
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ tree_values_to_profile (bsi_stmt (bsi), values);
+
+ for (i = 0; VEC_iterate (histogram_value, *values, i, hist); i++)
+ {
+ switch (hist->type)
+ {
+ case HIST_TYPE_INTERVAL:
+ if (dump_file)
+ {
+ fprintf (dump_file, "Interval counter for tree ");
+ print_generic_expr (dump_file, hist->hvalue.stmt,
+ TDF_SLIM);
+ fprintf (dump_file, ", range %d -- %d.\n",
+ hist->hdata.intvl.int_start,
+ (hist->hdata.intvl.int_start
+ + hist->hdata.intvl.steps - 1));
+ }
+ hist->n_counters = hist->hdata.intvl.steps + 2;
+ break;
+
+ case HIST_TYPE_POW2:
+ if (dump_file)
+ {
+ fprintf (dump_file, "Pow2 counter for tree ");
+ print_generic_expr (dump_file, hist->hvalue.stmt, TDF_SLIM);
+ fprintf (dump_file, ".\n");
+ }
+ hist->n_counters = 2;
+ break;
+
+ case HIST_TYPE_SINGLE_VALUE:
+ if (dump_file)
+ {
+ fprintf (dump_file, "Single value counter for tree ");
+ print_generic_expr (dump_file, hist->hvalue.stmt, TDF_SLIM);
+ fprintf (dump_file, ".\n");
+ }
+ hist->n_counters = 3;
+ break;
+
+ case HIST_TYPE_CONST_DELTA:
+ if (dump_file)
+ {
+ fprintf (dump_file, "Constant delta counter for tree ");
+ print_generic_expr (dump_file, hist->hvalue.stmt, TDF_SLIM);
+ fprintf (dump_file, ".\n");
+ }
+ hist->n_counters = 4;
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+}
+
+static struct value_prof_hooks tree_value_prof_hooks = {
+ tree_find_values_to_profile,
+ tree_value_profile_transformations
+};
+
+void
+tree_register_value_prof_hooks (void)
+{
+ value_prof_hooks = &tree_value_prof_hooks;
+ gcc_assert (ir_type ());
+}
+\f
+/* IR-independent entry points. */
+void
+find_values_to_profile (histogram_values *values)
+{
+ (value_prof_hooks->find_values_to_profile) (values);
+}
+
+bool
+value_profile_transformations (void)
+{
+ return (value_prof_hooks->value_profile_transformations) ();
+}
+\f
+
OSDN Git Service
