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233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/* Routines required for instrumenting a program. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1989-2016 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgcov.h"
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#if defined(inhibit_libc)
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/* If libc and its header files are not available, provide dummy functions. */
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#ifdef L_gcov_merge_add
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void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#ifdef L_gcov_merge_single
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void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#ifdef L_gcov_merge_delta
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void __gcov_merge_delta (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#else
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#ifdef L_gcov_merge_add
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/* The profile merging function that just adds the counters. It is given
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an array COUNTERS of N_COUNTERS old counters and it reads the same number
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of counters from the gcov file. */
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void
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__gcov_merge_add (gcov_type *counters, unsigned n_counters)
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{
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for (; n_counters; counters++, n_counters--)
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*counters += gcov_get_counter ();
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}
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#endif /* L_gcov_merge_add */
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#ifdef L_gcov_merge_ior
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/* The profile merging function that just adds the counters. It is given
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an array COUNTERS of N_COUNTERS old counters and it reads the same number
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of counters from the gcov file. */
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void
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__gcov_merge_ior (gcov_type *counters, unsigned n_counters)
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{
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for (; n_counters; counters++, n_counters--)
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*counters |= gcov_get_counter_target ();
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}
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#endif
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#ifdef L_gcov_merge_time_profile
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/* Time profiles are merged so that minimum from all valid (greater than zero)
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is stored. There could be a fork that creates new counters. To have
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the profile stable, we chosen to pick the smallest function visit time. */
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void
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__gcov_merge_time_profile (gcov_type *counters, unsigned n_counters)
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{
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unsigned int i;
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gcov_type value;
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for (i = 0; i < n_counters; i++)
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{
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value = gcov_get_counter_target ();
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if (value && (!counters[i] || value < counters[i]))
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counters[i] = value;
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}
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}
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#endif /* L_gcov_merge_time_profile */
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#ifdef L_gcov_merge_single
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/* The profile merging function for choosing the most common value.
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It is given an array COUNTERS of N_COUNTERS old counters and it
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reads the same number of counters from the gcov file. The counters
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are split into 3-tuples where the members of the tuple have
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meanings:
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-- the stored candidate on the most common value of the measured entity
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-- counter
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-- total number of evaluations of the value */
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void
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__gcov_merge_single (gcov_type *counters, unsigned n_counters)
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{
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unsigned i, n_measures;
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gcov_type value, counter, all;
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gcc_assert (!(n_counters % 3));
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n_measures = n_counters / 3;
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for (i = 0; i < n_measures; i++, counters += 3)
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{
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value = gcov_get_counter_target ();
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counter = gcov_get_counter ();
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all = gcov_get_counter ();
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if (counters[0] == value)
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counters[1] += counter;
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else if (counter > counters[1])
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{
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counters[0] = value;
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counters[1] = counter - counters[1];
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}
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else
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counters[1] -= counter;
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counters[2] += all;
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}
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}
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#endif /* L_gcov_merge_single */
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#ifdef L_gcov_merge_delta
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/* The profile merging function for choosing the most common
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difference between two consecutive evaluations of the value. It is
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given an array COUNTERS of N_COUNTERS old counters and it reads the
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same number of counters from the gcov file. The counters are split
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into 4-tuples where the members of the tuple have meanings:
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-- the last value of the measured entity
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-- the stored candidate on the most common difference
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-- counter
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-- total number of evaluations of the value */
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void
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__gcov_merge_delta (gcov_type *counters, unsigned n_counters)
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{
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unsigned i, n_measures;
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gcov_type value, counter, all;
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gcc_assert (!(n_counters % 4));
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n_measures = n_counters / 4;
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for (i = 0; i < n_measures; i++, counters += 4)
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{
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/* last = */ gcov_get_counter ();
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value = gcov_get_counter_target ();
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counter = gcov_get_counter ();
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all = gcov_get_counter ();
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if (counters[1] == value)
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counters[2] += counter;
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else if (counter > counters[2])
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{
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counters[1] = value;
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counters[2] = counter - counters[2];
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}
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else
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counters[2] -= counter;
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counters[3] += all;
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}
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}
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#endif /* L_gcov_merge_delta */
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#ifdef L_gcov_merge_icall_topn
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/* The profile merging function used for merging indirect call counts
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This function is given array COUNTERS of N_COUNTERS old counters and it
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reads the same number of counters from the gcov file. */
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void
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__gcov_merge_icall_topn (gcov_type *counters, unsigned n_counters)
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{
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unsigned i, j, k, m;
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gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS));
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for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS)
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{
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gcov_type *value_array = &counters[i + 1];
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unsigned tmp_size = 2 * (GCOV_ICALL_TOPN_NCOUNTS - 1);
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gcov_type *tmp_array
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= (gcov_type *) alloca (tmp_size * sizeof (gcov_type));
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for (j = 0; j < tmp_size; j++)
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tmp_array[j] = 0;
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for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2)
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{
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tmp_array[j] = value_array[j];
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tmp_array[j + 1] = value_array [j + 1];
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}
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/* Skip the number_of_eviction entry. */
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gcov_get_counter ();
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for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2)
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{
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int found = 0;
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gcov_type global_id = gcov_get_counter_target ();
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gcov_type call_count = gcov_get_counter ();
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for (m = 0; m < j; m += 2)
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{
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if (tmp_array[m] == global_id)
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{
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found = 1;
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tmp_array[m + 1] += call_count;
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break;
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}
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}
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if (!found)
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{
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tmp_array[j] = global_id;
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tmp_array[j + 1] = call_count;
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j += 2;
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}
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}
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/* Now sort the temp array */
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gcov_sort_n_vals (tmp_array, j);
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/* Now copy back the top half of the temp array */
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for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2)
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{
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value_array[k] = tmp_array[k];
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value_array[k + 1] = tmp_array[k + 1];
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}
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}
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}
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#endif /* L_gcov_merge_icall_topn */
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#endif /* inhibit_libc */
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