2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Statistic functions for constant counting.
23 * @author Michael Beck
28 #include "firmstat_t.h"
32 * calculated the dual logarithm of |value|
34 static unsigned log2abs(long value) {
64 * classify the value of a float tarval
66 static float_classify_t classify_float_value(tarval *tv) {
67 ir_mode *mode = get_tarval_mode(tv);
69 if (tv == get_mode_null(mode))
71 else if (tv == get_mode_one(mode))
73 else if (tarval_is_finite(tv) && tarval_ieee754_zero_mantissa(tv)) {
74 int exp = tarval_ieee754_get_exponent(tv);
76 if (! tarval_is_negative(tv)) {
82 return STAT_FC_POWER_OF_TWO;
87 /* return a human readable name for an float classification */
88 const char *stat_fc_name(float_classify_t classification) {
89 switch (classification) {
90 case STAT_FC_0: return "0.0";
91 case STAT_FC_1: return "1.0";
92 case STAT_FC_2: return "2.0";
93 case STAT_FC_0_5: return "0.5";
94 case STAT_FC_POWER_OF_TWO: return "2.0^x";
95 case STAT_FC_OTHER: return "other";
96 default: return "<UNKNOWN>";
100 /* update info on Consts */
101 void stat_update_const(stat_info_t *status, ir_node *node, graph_entry_t *graph)
103 ir_mode *mode = get_irn_mode(node);
108 if (mode_is_int(mode)) {
109 tv = get_Const_tarval(node);
112 if (! tarval_is_long(tv))
115 bits = log2abs(get_tarval_long(tv));
117 if (bits > ARR_SIZE(status->const_info.int_bits_count))
118 bits = ARR_SIZE(status->const_info.int_bits_count);
120 cnt_inc(&status->const_info.int_bits_count[bits]);
121 } else if (mode_is_float(mode)) {
122 tv = get_Const_tarval(node);
124 cnt_inc(&status->const_info.floats[classify_float_value(tv)]);
126 /* something different */
127 cnt_inc(&status->const_info.others);
131 /* clears the const statistics for a new snapshot */
132 void stat_const_clear(stat_info_t *status) {
135 for (i = 0; i < ARR_SIZE(status->const_info.int_bits_count); ++i)
136 cnt_clr(&status->const_info.int_bits_count[i]);
138 for (i = 0; i < ARR_SIZE(status->const_info.floats); ++i)
139 cnt_clr(&status->const_info.floats[i]);
141 cnt_clr(&status->const_info.others);
144 /* initialize the Const statistic. */
145 void stat_init_const_cnt(stat_info_t *status) {
147 /* currently nothing */