1 /*
2
3 BLIS
4 An object-based framework for developing high-performance BLAS-like
5 libraries.
6
7 Copyright (C) 2014, The University of Texas at Austin
8 Copyright (C) 2018 - 2019, Advanced Micro Devices, Inc.
9
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions are
12 met:
13 - Redistributions of source code must retain the above copyright
14 notice, this list of conditions and the following disclaimer.
15 - Redistributions in binary form must reproduce the above copyright
16 notice, this list of conditions and the following disclaimer in the
17 documentation and/or other materials provided with the distribution.
18 - Neither the name(s) of the copyright holder(s) nor the names of its
19 contributors may be used to endorse or promote products derived
20 from this software without specific prior written permission.
21
22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33
34 */
35
36 #include "blis.h"
37
38 static double gtod_ref_time_sec = 0.0;
39
bli_clock(void)40 double bli_clock( void )
41 {
42 return bli_clock_helper();
43 }
44
bli_clock_min_diff(double time_min,double time_start)45 double bli_clock_min_diff( double time_min, double time_start )
46 {
47 double time_min_prev;
48 double time_diff;
49
50 // Save the old value.
51 time_min_prev = time_min;
52
53 time_diff = bli_clock() - time_start;
54
55 time_min = bli_fmin( time_min, time_diff );
56
57 // Assume that anything:
58 // - under or equal to zero,
59 // - under a nanosecond
60 // is actually garbled due to the clocks being taken too closely together.
61 if ( time_min <= 0.0 ) time_min = time_min_prev;
62 else if ( time_min < 1.0e-9 ) time_min = time_min_prev;
63
64 return time_min;
65 }
66
67 #ifdef BLIS_DISABLE_SYSTEM
68 // --- Begin systemless definitions --------------------------------------------
69
bli_clock_helper()70 double bli_clock_helper()
71 {
72 return 0.0;
73 }
74
75 // --- End systemless definitions ----------------------------------------------
76 #else
77 // --- Begin system definitions ------------------------------------------------
78
79 #if BLIS_OS_WINDOWS
80 // --- Begin Windows build definitions -----------------------------------------
81
bli_clock_helper()82 double bli_clock_helper()
83 {
84 LARGE_INTEGER clock_freq = {0};
85 LARGE_INTEGER clock_val;
86 BOOL r_val;
87
88 r_val = QueryPerformanceFrequency( &clock_freq );
89
90 if ( r_val == 0 )
91 {
92 bli_print_msg( "QueryPerformanceFrequency() failed", __FILE__, __LINE__ );
93 bli_abort();
94 }
95
96 r_val = QueryPerformanceCounter( &clock_val );
97
98 if ( r_val == 0 )
99 {
100 bli_print_msg( "QueryPerformanceCounter() failed", __FILE__, __LINE__ );
101 bli_abort();
102 }
103
104 return ( ( double) clock_val.QuadPart / ( double) clock_freq.QuadPart );
105 }
106
107 // --- End Windows build definitions -------------------------------------------
108 #elif BLIS_OS_OSX
109 // --- Begin OSX build definitions -------------------------------------------
110
bli_clock_helper()111 double bli_clock_helper()
112 {
113 mach_timebase_info_data_t timebase;
114 mach_timebase_info( &timebase );
115
116 uint64_t nsec = mach_absolute_time();
117
118 double the_time = (double) nsec * 1.0e-9 * timebase.numer / timebase.denom;
119
120 if ( gtod_ref_time_sec == 0.0 )
121 gtod_ref_time_sec = the_time;
122
123 return the_time - gtod_ref_time_sec;
124 }
125
126 // --- End OSX build definitions ---------------------------------------------
127 #else
128 // --- Begin Linux build definitions -------------------------------------------
129
bli_clock_helper()130 double bli_clock_helper()
131 {
132 double the_time, norm_sec;
133 struct timespec ts;
134
135 clock_gettime( CLOCK_MONOTONIC, &ts );
136
137 if ( gtod_ref_time_sec == 0.0 )
138 gtod_ref_time_sec = ( double ) ts.tv_sec;
139
140 norm_sec = ( double ) ts.tv_sec - gtod_ref_time_sec;
141
142 the_time = norm_sec + ts.tv_nsec * 1.0e-9;
143
144 return the_time;
145 }
146
147 // --- End Linux build definitions ---------------------------------------------
148 #endif
149
150 // --- End system definitions --------------------------------------------------
151 #endif
152
153