value-prof.c: New.
* value-prof.c: New. * value-prof.h: New. From-SVN: r68521
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Zdenek Dvorak
parent
603ff6b50a
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1c72f4ef67
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/* Transformations based on profile information for values.
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Copyright (C) 2003 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 2, 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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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "expr.h"
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#include "hard-reg-set.h"
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#include "basic-block.h"
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#include "value-prof.h"
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#include "output.h"
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#include "flags.h"
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#include "insn-config.h"
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#include "recog.h"
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#include "optabs.h"
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/* In this file value profile based optimizations will be placed (none are
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here just now, but they are hopefully coming soon).
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Every such optimization should add its requirements for profiled values to
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insn_values_to_profile function. This function is called from branch_prob
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in profile.c and the requested values are instrumented by it in the first
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compilation with -fprofile-arcs. The optimization may then read the
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gathered data in the second compilation with -fbranch-probablities (the
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description of an exact way how to do it will be added here once the
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code responsible for reading of the data is merged). */
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static void insn_values_to_profile (rtx, unsigned *, struct histogram_value **);
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/* Release the list of VALUES of length N_VALUES for that we want to measure
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histograms. */
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void
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free_profiled_values (unsigned n_values ATTRIBUTE_UNUSED,
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struct histogram_value *values)
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{
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free (values);
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}
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/* Find values inside INSN for that we want to measure histograms and adds
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them to list VALUES (increasing the record of its length in N_VALUES). */
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static void
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insn_values_to_profile (rtx insn ATTRIBUTE_UNUSED,
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unsigned *n_values ATTRIBUTE_UNUSED,
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struct histogram_value **values ATTRIBUTE_UNUSED)
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{
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}
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/* Find list of values for that we want to measure histograms. */
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void
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find_values_to_profile (unsigned *n_values, struct histogram_value **values)
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{
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rtx insn;
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unsigned i;
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*n_values = 0;
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*values = NULL;
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for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
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insn_values_to_profile (insn, n_values, values);
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for (i = 0; i < *n_values; i++)
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{
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switch ((*values)[i].type)
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{
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case HIST_TYPE_INTERVAL:
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(*values)[i].n_counters = (*values)[i].hdata.intvl.steps +
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((*values)[i].hdata.intvl.may_be_less ? 1 : 0) +
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((*values)[i].hdata.intvl.may_be_more ? 1 : 0);
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break;
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case HIST_TYPE_POW2:
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(*values)[i].n_counters = GET_MODE_BITSIZE ((*values)[i].mode) +
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((*values)[i].hdata.pow2.may_be_other ? 1 : 0);
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break;
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case HIST_TYPE_SINGLE_VALUE:
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(*values)[i].n_counters = 3;
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break;
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case HIST_TYPE_CONST_DELTA:
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(*values)[i].n_counters = 4;
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break;
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default:
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abort ();
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}
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}
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}
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@ -0,0 +1,59 @@
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/* Definitions for transformations based on profile information for values.
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Copyright (C) 2003 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 2, 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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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* Supported histogram types. */
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enum hist_type
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{
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HIST_TYPE_INTERVAL, /* Measures histogram of values inside a specified
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interval. */
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HIST_TYPE_POW2, /* Histogram of power of 2 values. */
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HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
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always constant. */
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HIST_TYPE_CONST_DELTA /* Tries to identify the (almost) always constant
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difference between two evaluations of a value. */
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};
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/* The value to measure. */
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struct histogram_value
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{
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rtx value; /* The value to profile. */
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enum machine_mode mode; /* And its mode. */
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rtx seq; /* Insns requiered to count the profiled value. */
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rtx insn; /* Insn before that to measure. */
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enum hist_type type; /* Type of information to measure. */
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unsigned n_counters; /* Number of requiered counters. */
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union
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{
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struct
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{
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int int_start; /* First value in interval. */
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int steps; /* Number of values in it. */
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int may_be_less; /* May the value be below? */
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int may_be_more; /* Or above. */
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} intvl; /* Interval histogram data. */
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struct
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{
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int may_be_other; /* If the value may be non-positive or not 2^k. */
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} pow2; /* Power of 2 histogram data. */
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} hdata; /* Profiled information specific data. */
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};
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extern void find_values_to_profile (unsigned *, struct histogram_value **);
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extern void free_profiled_values (unsigned, struct histogram_value *);
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