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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C51 Version 7 Operation Timings
Large Model
The following benchmarks provide a baseline for the execution speed of code generated by the Keil C51 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 + | 14 2.33 µSecs |
14 2.33 µSecs |
14 2.33 µSecs |
| unsigned char - | 15 2.50 µSecs |
15 2.50 µSecs |
15 2.50 µSecs |
| unsigned char * | 19 3.17 µSecs |
19 3.17 µSecs |
19 3.17 µSecs |
| unsigned char / | 19 3.17 µSecs |
19 3.17 µSecs |
19 3.17 µSecs |
| unsigned char % | 20 3.33 µSecs |
20 3.33 µSecs |
20 3.33 µSecs |
| unsigned char >> | 21 3.50 µSecs |
51 8.50 µSecs |
81 13.50 µSecs |
| unsigned char << | 21 3.50 µSecs |
51 8.50 µSecs |
81 13.50 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 14 2.33 µSecs |
14 2.33 µSecs |
14 2.33 µSecs |
| signed char - | 15 2.50 µSecs |
15 2.50 µSecs |
15 2.50 µSecs |
| signed char * | 19 3.17 µSecs |
19 3.17 µSecs |
19 3.17 µSecs |
| signed char / | 31 5.17 µSecs |
38 6.33 µSecs |
43 7.17 µSecs |
| signed char % | 34 5.67 µSecs |
41 6.83 µSecs |
46 7.67 µSecs |
| signed char >> | 21 3.50 µSecs |
51 8.50 µSecs |
81 13.50 µSecs |
| signed char << | 21 3.50 µSecs |
51 8.50 µSecs |
81 13.50 µSecs |
| cabs () | 22 3.67 µSecs |
23 3.83 µSecs |
24 4.00 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 30 5.00 µSecs |
30 5.00 µSecs |
30 5.00 µSecs |
| unsigned int - | 31 5.17 µSecs |
31 5.17 µSecs |
31 5.17 µSecs |
| unsigned int * | 60 10.00 µSecs |
60 10.00 µSecs |
60 10.00 µSecs |
| unsigned int / | 180 30.00 µSecs |
183 30.50 µSecs |
210 35.00 µSecs |
| unsigned int % | 180 30.00 µSecs |
183 30.50 µSecs |
210 35.00 µSecs |
| unsigned int >> | 36 6.00 µSecs |
88 14.67 µSecs |
141 23.50 µSecs |
| unsigned int << | 36 6.00 µSecs |
88 14.67 µSecs |
141 23.50 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 30 5.00 µSecs |
30 5.00 µSecs |
30 5.00 µSecs |
| signed int - | 31 5.17 µSecs |
31 5.17 µSecs |
31 5.17 µSecs |
| signed int * | 60 10.00 µSecs |
60 10.00 µSecs |
60 10.00 µSecs |
| signed int / | 61 10.17 µSecs |
212 35.33 µSecs |
247 41.17 µSecs |
| signed int % | 61 10.17 µSecs |
212 35.33 µSecs |
247 41.17 µSecs |
| signed int >> | 36 6.00 µSecs |
88 14.67 µSecs |
141 23.50 µSecs |
| signed int << | 36 6.00 µSecs |
88 14.67 µSecs |
141 23.50 µSecs |
| abs () | 32 5.33 µSecs |
34 5.67 µSecs |
37 6.17 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 74 12.33 µSecs |
74 12.33 µSecs |
74 12.33 µSecs |
| unsigned long - | 75 12.50 µSecs |
75 12.50 µSecs |
75 12.50 µSecs |
| unsigned long * | 172 28.67 µSecs |
172 28.67 µSecs |
172 28.67 µSecs |
| unsigned long / | 293 48.83 µSecs |
300 50.00 µSecs |
359 59.83 µSecs |
| unsigned long % | 301 50.17 µSecs |
308 51.33 µSecs |
367 61.17 µSecs |
| unsigned long >> | 64 10.67 µSecs |
296 49.33 µSecs |
529 88.17 µSecs |
| unsigned long << | 64 10.67 µSecs |
296 49.33 µSecs |
529 88.17 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 74 12.33 µSecs |
74 12.33 µSecs |
74 12.33 µSecs |
| signed long - | 75 12.50 µSecs |
75 12.50 µSecs |
75 12.50 µSecs |
| signed long * | 172 28.67 µSecs |
172 28.67 µSecs |
172 28.67 µSecs |
| signed long / | 306 51.00 µSecs |
346 57.67 µSecs |
658 109.67 µSecs |
| signed long % | 314 52.33 µSecs |
354 59.00 µSecs |
666 111.00 µSecs |
| signed long >> | 64 10.67 µSecs |
296 49.33 µSecs |
529 88.17 µSecs |
| signed long << | 64 10.67 µSecs |
296 49.33 µSecs |
529 88.17 µSecs |
| labs () | 98 16.33 µSecs |
115 19.17 µSecs |
133 22.17 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 192 32.00 µSecs |
239 39.83 µSecs |
405 67.50 µSecs |
| float - | 176 29.33 µSecs |
241 40.17 µSecs |
374 62.33 µSecs |
| float * | 159 26.50 µSecs |
259 43.17 µSecs |
271 45.17 µSecs |
| float / | 699 116.50 µSecs |
935 155.83 µSecs |
1,114 185.67 µSecs |
| fmod () | 430 71.67 µSecs |
2,253 375.50 µSecs |
4,157 692.83 µSecs |
| modf () | 1,687 281.17 µSecs |
2,179 363.17 µSecs |
2,347 391.17 µSecs |
| fabs () | 56 9.33 µSecs |
57 9.50 µSecs |
59 9.83 µSecs |
| ceil () | 1,282 213.67 µSecs |
1,745 290.83 µSecs |
1,976 329.33 µSecs |
| floor () | 1,282 213.67 µSecs |
1,744 290.67 µSecs |
1,991 331.83 µSecs |
| pow () | 994 165.67 µSecs |
3,929 654.83 µSecs |
10,579 1,763.17 µSecs |
| sqrt () | 63 10.50 µSecs |
1,173 195.50 µSecs |
2,436 406.00 µSecs |
| exp () | 274 45.67 µSecs |
306 51.00 µSecs |
4,507 751.17 µSecs |
| log () | 68 11.33 µSecs |
2,082 347.00 µSecs |
4,346 724.33 µSecs |
| log10 () | 70 11.67 µSecs |
2,182 363.67 µSecs |
4,546 757.67 µSecs |
| sin () | 704 117.33 µSecs |
3,326 554.33 µSecs |
3,787 631.17 µSecs |
| cos () | 627 104.50 µSecs |
3,328 554.67 µSecs |
3,767 627.83 µSecs |
| tan () | 4,357 726.17 µSecs |
4,724 787.33 µSecs |
4,904 817.33 µSecs |
| asin () | 374 62.33 µSecs |
7,328 1,221.33 µSecs |
8,733 1,455.50 µSecs |
| acos () | 874 145.67 µSecs |
7,900 1,316.67 µSecs |
8,902 1,483.67 µSecs |
| atan () | 1,608 268.00 µSecs |
4,408 734.67 µSecs |
5,379 896.50 µSecs |
| atan2 () | 1,982 330.33 µSecs |
5,224 870.67 µSecs |
6,716 1,119.33 µSecs |
| sinh () | 2,878 479.67 µSecs |
10,849 1,808.17 µSecs |
11,829 1,971.50 µSecs |
| cosh () | 2,924 487.33 µSecs |
10,834 1,805.67 µSecs |
11,812 1,968.67 µSecs |
| tanh () | 10,403 1,733.83 µSecs |
11,058 1,843.00 µSecs |
12,932 2,155.33 µSecs |
Buffer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| memset (10) | 87 14.50 µSecs |
87 14.50 µSecs |
87 14.50 µSecs |
| memset (100) | 627 104.50 µSecs |
627 104.50 µSecs |
627 104.50 µSecs |
| memset (1000) | 6,033 1,005.50 µSecs |
6,033 1,005.50 µSecs |
6,033 1,005.50 µSecs |
| memcpy (10) | 280 46.67 µSecs |
280 46.67 µSecs |
280 46.67 µSecs |
| memcpy (100) | 2,260 376.67 µSecs |
2,260 376.67 µSecs |
2,260 376.67 µSecs |
| memcpy (1000) | 22,066 3,677.67 µSecs |
22,066 3,677.67 µSecs |
22,066 3,677.67 µSecs |
| memmove (10 with overlap) |
289 48.17 µSecs |
289 48.17 µSecs |
289 48.17 µSecs |
| memmove (100 with overlap) |
2,269 378.17 µSecs |
2,269 378.17 µSecs |
2,269 378.17 µSecs |
| memmove (1000 with overlap) |
22,075 3,679.17 µSecs |
22,075 3,679.17 µSecs |
22,075 3,679.17 µSecs |
Memory Allocation Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| malloc (), 99.3% successful |
176 29.33 µSecs |
764 127.33 µSecs |
1,727 287.83 µSecs |
| free () | 251 41.83 µSecs |
940 156.67 µSecs |
1,890 315.00 µSecs |
Note
- These tests were performed and measured using the µVision Debugger. Test code was compiled with the C51 Version 7.20 C Compiler using the Large Memory Model, ROM(Large), and Optimization Level 8-SPEED.
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