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Diffstat (limited to 'contrib/gcc/value-prof.h')
-rw-r--r-- | contrib/gcc/value-prof.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/contrib/gcc/value-prof.h b/contrib/gcc/value-prof.h new file mode 100644 index 0000000..afbeb91 --- /dev/null +++ b/contrib/gcc/value-prof.h @@ -0,0 +1,64 @@ +/* Definitions for transformations based on profile information for values. + Copyright (C) 2003 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +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. */ + +/* Supported histogram types. */ +enum hist_type +{ + HIST_TYPE_INTERVAL, /* Measures histogram of values inside a specified + interval. */ + HIST_TYPE_POW2, /* Histogram of power of 2 values. */ + HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost) + always constant. */ + HIST_TYPE_CONST_DELTA /* Tries to identify the (almost) always constant + difference between two evaluations of a value. */ +}; + +#define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER) +#define HIST_TYPE_FOR_COUNTER(COUNTER) \ + ((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER)) + +/* The value to measure. */ +struct histogram_value +{ + rtx value; /* The value to profile. */ + enum machine_mode mode; /* And its mode. */ + rtx seq; /* Insns required to count the profiled value. */ + rtx insn; /* Insn before that to measure. */ + enum hist_type type; /* Type of information to measure. */ + unsigned n_counters; /* Number of required counters. */ + union + { + struct + { + int int_start; /* First value in interval. */ + int steps; /* Number of values in it. */ + int may_be_less; /* May the value be below? */ + int may_be_more; /* Or above. */ + } intvl; /* Interval histogram data. */ + struct + { + int may_be_other; /* If the value may be non-positive or not 2^k. */ + } pow2; /* Power of 2 histogram data. */ + } hdata; /* Profiled information specific data. */ +}; + +extern void find_values_to_profile (unsigned *, struct histogram_value **); +extern void free_profiled_values (unsigned, struct histogram_value *); +extern bool value_profile_transformations (void); |