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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C166 Version 5 Operation Timings
C16x Devices — Small Model
The following benchmarks provide a baseline for the execution speed of code generated by the Keil C166 Compiler. Automated test scripts were used to calculate the minimum, average, and maximum time required for each operation.
Each benchmark lists the number of states and the number of seconds required to perform the operation. The state time represents the actual number of instruction cycles. You may specify the oscillator frequency and the clock divisor (for the instruction clock) to obtain execution times in seconds.
Unsigned Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned char + | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| unsigned char - | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| unsigned char * | 36 1.80 µSecs |
36 1.80 µSecs |
36 1.80 µSecs |
| unsigned char / | 50 2.50 µSecs |
50 2.50 µSecs |
50 2.50 µSecs |
| unsigned char % | 54 2.70 µSecs |
54 2.70 µSecs |
54 2.70 µSecs |
| unsigned char >> | 24 1.20 µSecs |
24 1.20 µSecs |
24 1.20 µSecs |
| unsigned char << | 22 1.10 µSecs |
22 1.10 µSecs |
22 1.10 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| signed char - | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| signed char * | 36 1.80 µSecs |
36 1.80 µSecs |
36 1.80 µSecs |
| signed char / | 50 2.50 µSecs |
50 2.50 µSecs |
50 2.50 µSecs |
| signed char % | 54 2.70 µSecs |
54 2.70 µSecs |
54 2.70 µSecs |
| signed char >> | 24 1.20 µSecs |
24 1.20 µSecs |
24 1.20 µSecs |
| signed char << | 22 1.10 µSecs |
22 1.10 µSecs |
22 1.10 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| unsigned int - | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| unsigned int * | 32 1.60 µSecs |
32 1.60 µSecs |
32 1.60 µSecs |
| unsigned int / | 46 2.30 µSecs |
46 2.30 µSecs |
46 2.30 µSecs |
| unsigned int % | 50 2.50 µSecs |
50 2.50 µSecs |
50 2.50 µSecs |
| unsigned int >> | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| unsigned int << | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| signed int - | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| signed int * | 32 1.60 µSecs |
32 1.60 µSecs |
32 1.60 µSecs |
| signed int / | 46 2.30 µSecs |
46 2.30 µSecs |
46 2.30 µSecs |
| signed int % | 50 2.50 µSecs |
50 2.50 µSecs |
50 2.50 µSecs |
| signed int >> | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| signed int << | 20 1.00 µSecs |
20 1.00 µSecs |
20 1.00 µSecs |
| abs () | 30 1.50 µSecs |
30 1.50 µSecs |
30 1.50 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 44 2.20 µSecs |
44 2.20 µSecs |
44 2.20 µSecs |
| unsigned long - | 44 2.20 µSecs |
44 2.20 µSecs |
44 2.20 µSecs |
| unsigned long * | 96 4.80 µSecs |
96 4.80 µSecs |
96 4.80 µSecs |
| unsigned long / | 162 8.10 µSecs |
164 8.20 µSecs |
174 8.70 µSecs |
| unsigned long % | 162 8.10 µSecs |
164 8.20 µSecs |
174 8.70 µSecs |
| unsigned long >> | 40 2.00 µSecs |
53 2.65 µSecs |
58 2.90 µSecs |
| unsigned long << | 40 2.00 µSecs |
53 2.65 µSecs |
58 2.90 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 44 2.20 µSecs |
44 2.20 µSecs |
44 2.20 µSecs |
| signed long - | 44 2.20 µSecs |
44 2.20 µSecs |
44 2.20 µSecs |
| signed long * | 96 4.80 µSecs |
96 4.80 µSecs |
96 4.80 µSecs |
| signed long / | 190 9.50 µSecs |
209 10.45 µSecs |
232 11.60 µSecs |
| signed long % | 190 9.50 µSecs |
209 10.45 µSecs |
232 11.60 µSecs |
| signed long >> | 40 2.00 µSecs |
53 2.65 µSecs |
58 2.90 µSecs |
| signed long << | 40 2.00 µSecs |
53 2.65 µSecs |
58 2.90 µSecs |
| labs () | 52 2.60 µSecs |
54 2.70 µSecs |
56 2.80 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 194 9.70 µSecs |
236 11.80 µSecs |
404 20.20 µSecs |
| float - | 162 8.10 µSecs |
240 12.00 µSecs |
408 20.40 µSecs |
| float * | 242 12.10 µSecs |
250 12.50 µSecs |
258 12.90 µSecs |
| float / | 318 15.90 µSecs |
325 16.25 µSecs |
334 16.70 µSecs |
| fmod () | 722 36.10 µSecs |
954 47.70 µSecs |
1,270 63.50 µSecs |
| modf () | 560 28.00 µSecs |
861 43.05 µSecs |
926 46.30 µSecs |
| fabs () | 168 8.40 µSecs |
169 8.45 µSecs |
170 8.50 µSecs |
| ceil () | 870 43.50 µSecs |
1,075 53.75 µSecs |
1,132 56.60 µSecs |
| floor () | 870 43.50 µSecs |
1,075 53.75 µSecs |
1,134 56.70 µSecs |
| pow () | 590 29.50 µSecs |
3,423 171.15 µSecs |
11,458 572.90 µSecs |
| sqrt () | 50 2.50 µSecs |
179 8.95 µSecs |
322 16.10 µSecs |
| exp () | 294 14.70 µSecs |
332 16.60 µSecs |
5,046 252.30 µSecs |
| log () | 48 2.40 µSecs |
1,976 98.80 µSecs |
4,694 234.70 µSecs |
| log10 () | 160 8.00 µSecs |
2,143 107.15 µSecs |
4,922 246.10 µSecs |
| sin () | 1,304 65.20 µSecs |
3,401 170.05 µSecs |
4,612 230.60 µSecs |
| cos () | 1,206 60.30 µSecs |
3,401 170.05 µSecs |
4,648 232.40 µSecs |
| tan () | 4,492 224.60 µSecs |
4,863 243.15 µSecs |
6,154 307.70 µSecs |
| asin () | 560 28.00 µSecs |
4,690 234.50 µSecs |
6,076 303.80 µSecs |
| acos () | 1,576 78.80 µSecs |
5,034 251.70 µSecs |
6,072 303.60 µSecs |
| atan () | 2,178 108.90 µSecs |
3,843 192.15 µSecs |
5,094 254.70 µSecs |
| atan2 () | 2,048 102.40 µSecs |
4,289 214.45 µSecs |
5,548 277.40 µSecs |
| sinh () | 4,864 243.20 µSecs |
10,999 549.95 µSecs |
13,960 698.00 µSecs |
| cosh () | 5,086 254.30 µSecs |
10,985 549.25 µSecs |
13,946 697.30 µSecs |
| tanh () | 10,002 500.10 µSecs |
10,775 538.75 µSecs |
13,768 688.40 µSecs |
Buffer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| memset (10) | 140 7.00 µSecs |
140 7.00 µSecs |
140 7.00 µSecs |
| memset (100) | 1,222 61.10 µSecs |
1,222 61.10 µSecs |
1,222 61.10 µSecs |
| memset (1000) | 12,022 601.10 µSecs |
12,022 601.10 µSecs |
12,022 601.10 µSecs |
| memcpy (10) | 158 7.90 µSecs |
158 7.90 µSecs |
158 7.90 µSecs |
| memcpy (100) | 1,420 71.00 µSecs |
1,420 71.00 µSecs |
1,420 71.00 µSecs |
| memcpy (1000) | 14,020 701.00 µSecs |
14,020 701.00 µSecs |
14,020 701.00 µSecs |
| memmove (10 with overlap) |
274 13.70 µSecs |
274 13.70 µSecs |
274 13.70 µSecs |
| memmove (100 with overlap) |
2,256 112.80 µSecs |
2,256 112.80 µSecs |
2,256 112.80 µSecs |
| memmove (1000 with overlap) |
22,056 1,102.80 µSecs |
22,056 1,102.80 µSecs |
22,056 1,102.80 µSecs |
Memory Allocation Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| malloc (), 99.5% successful |
118 5.90 µSecs |
481 24.05 µSecs |
1,272 63.60 µSecs |
| free () | 144 7.20 µSecs |
529 26.45 µSecs |
1,114 55.70 µSecs |
Note
- These tests were performed and measured using the µVision Debugger. Test code was compiled with the C166 Version 5.03 C Compiler using the Small Memory Model and Optimization Level 7-SPEED.
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