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"
33 * calculated the dual logarithm of |value|
35 static unsigned log2abs(long value)
66 * classify the value of a float tarval
68 static float_classify_t classify_float_value(ir_tarval *tv)
70 ir_mode *mode = get_tarval_mode(tv);
72 if (tv == get_mode_null(mode))
74 else if (tv == get_mode_one(mode))
76 else if (tarval_is_finite(tv) && tarval_ieee754_zero_mantissa(tv)) {
77 int exp = tarval_ieee754_get_exponent(tv);
79 if (! tarval_is_negative(tv)) {
85 return STAT_FC_POWER_OF_TWO;
90 /* return a human readable name for an float classification */
91 const char *stat_fc_name(float_classify_t classification)
93 switch (classification) {
94 case STAT_FC_0: return "0.0";
95 case STAT_FC_1: return "1.0";
96 case STAT_FC_2: return "2.0";
97 case STAT_FC_0_5: return "0.5";
98 case STAT_FC_POWER_OF_TWO: return "2.0^x";
99 case STAT_FC_OTHER: return "other";
100 default: return "<UNKNOWN>";
104 /* update info on Consts */
105 void stat_update_const(stat_info_t *status, ir_node *node, graph_entry_t *graph)
107 ir_mode *mode = get_irn_mode(node);
112 if (mode_is_int(mode)) {
113 tv = get_Const_tarval(node);
116 if (! tarval_is_long(tv))
119 bits = log2abs(get_tarval_long(tv));
121 if (bits > ARRAY_SIZE(status->const_info.int_bits_count))
122 bits = ARRAY_SIZE(status->const_info.int_bits_count);
124 cnt_inc(&status->const_info.int_bits_count[bits]);
125 } else if (mode_is_float(mode)) {
126 tv = get_Const_tarval(node);
128 cnt_inc(&status->const_info.floats[classify_float_value(tv)]);
130 /* something different */
131 cnt_inc(&status->const_info.others);
135 /* clears the const statistics for a new snapshot */
136 void stat_const_clear(stat_info_t *status)
140 for (i = 0; i < ARRAY_SIZE(status->const_info.int_bits_count); ++i)
141 cnt_clr(&status->const_info.int_bits_count[i]);
143 for (i = 0; i < ARRAY_SIZE(status->const_info.floats); ++i)
144 cnt_clr(&status->const_info.floats[i]);
146 cnt_clr(&status->const_info.others);
149 /* initialize the Const statistic. */
150 void stat_init_const_cnt(stat_info_t *status)
153 /* currently nothing */