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
27 #include "firmstat_t.h"
32 * calculated the dual logarithm of |value|
34 static unsigned log2abs(long value)
65 * classify the value of a float tarval
67 static float_classify_t classify_float_value(ir_tarval *tv)
69 ir_mode *mode = get_tarval_mode(tv);
71 if (tv == get_mode_null(mode))
73 else if (tv == get_mode_one(mode))
75 else if (tarval_is_finite(tv) && tarval_zero_mantissa(tv)) {
76 int exp = tarval_get_exponent(tv);
78 if (! tarval_is_negative(tv)) {
84 return STAT_FC_POWER_OF_TWO;
89 /* return a human readable name for an float classification */
90 const char *stat_fc_name(float_classify_t classification)
92 switch (classification) {
93 case STAT_FC_0: return "0.0";
94 case STAT_FC_1: return "1.0";
95 case STAT_FC_2: return "2.0";
96 case STAT_FC_0_5: return "0.5";
97 case STAT_FC_POWER_OF_TWO: return "2.0^x";
98 case STAT_FC_OTHER: return "other";
99 default: return "<UNKNOWN>";
103 /* update info on Consts */
104 void stat_update_const(stat_info_t *status, ir_node *node, graph_entry_t *graph)
106 ir_mode *mode = get_irn_mode(node);
111 if (mode_is_int(mode)) {
112 tv = get_Const_tarval(node);
115 if (! tarval_is_long(tv))
118 bits = log2abs(get_tarval_long(tv));
120 if (bits > ARRAY_SIZE(status->const_info.int_bits_count))
121 bits = ARRAY_SIZE(status->const_info.int_bits_count);
123 cnt_inc(&status->const_info.int_bits_count[bits]);
124 } else if (mode_is_float(mode)) {
125 tv = get_Const_tarval(node);
127 cnt_inc(&status->const_info.floats[classify_float_value(tv)]);
129 /* something different */
130 cnt_inc(&status->const_info.others);
134 /* clears the const statistics for a new snapshot */
135 void stat_const_clear(stat_info_t *status)
139 for (i = 0; i < ARRAY_SIZE(status->const_info.int_bits_count); ++i)
140 cnt_clr(&status->const_info.int_bits_count[i]);
142 for (i = 0; i < ARRAY_SIZE(status->const_info.floats); ++i)
143 cnt_clr(&status->const_info.floats[i]);
145 cnt_clr(&status->const_info.others);
148 /* initialize the Const statistic. */
149 void stat_init_const_cnt(stat_info_t *status)
152 /* currently nothing */