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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C51 Version 7 Operation Timings
Small 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 + | 3 .50 µSecs |
3 .50 µSecs |
3 .50 µSecs |
| unsigned char - | 4 .67 µSecs |
4 .67 µSecs |
4 .67 µSecs |
| unsigned char * | 8 1.33 µSecs |
8 1.33 µSecs |
8 1.33 µSecs |
| unsigned char / | 8 1.33 µSecs |
8 1.33 µSecs |
8 1.33 µSecs |
| unsigned char % | 9 1.50 µSecs |
9 1.50 µSecs |
9 1.50 µSecs |
| unsigned char >> | 11 1.83 µSecs |
41 6.83 µSecs |
71 11.83 µSecs |
| unsigned char << | 11 1.83 µSecs |
41 6.83 µSecs |
71 11.83 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 3 .50 µSecs |
3 .50 µSecs |
3 .50 µSecs |
| signed char - | 4 .67 µSecs |
4 .67 µSecs |
4 .67 µSecs |
| signed char * | 8 1.33 µSecs |
8 1.33 µSecs |
8 1.33 µSecs |
| signed char / | 19 3.17 µSecs |
26 4.33 µSecs |
31 5.17 µSecs |
| signed char % | 20 3.33 µSecs |
27 4.50 µSecs |
32 5.33 µSecs |
| signed char >> | 11 1.83 µSecs |
41 6.83 µSecs |
71 11.83 µSecs |
| signed char << | 11 1.83 µSecs |
41 6.83 µSecs |
71 11.83 µSecs |
| cabs () | 16 2.67 µSecs |
17 2.83 µSecs |
18 3.00 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 6 1.00 µSecs |
6 1.00 µSecs |
6 1.00 µSecs |
| unsigned int - | 7 1.17 µSecs |
7 1.17 µSecs |
7 1.17 µSecs |
| unsigned int * | 42 7.00 µSecs |
42 7.00 µSecs |
42 7.00 µSecs |
| unsigned int / | 162 27.00 µSecs |
165 27.50 µSecs |
192 32.00 µSecs |
| unsigned int % | 162 27.00 µSecs |
165 27.50 µSecs |
192 32.00 µSecs |
| unsigned int >> | 15 2.50 µSecs |
67 11.17 µSecs |
120 20.00 µSecs |
| unsigned int << | 15 2.50 µSecs |
67 11.17 µSecs |
120 20.00 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 6 1.00 µSecs |
6 1.00 µSecs |
6 1.00 µSecs |
| signed int - | 7 1.17 µSecs |
7 1.17 µSecs |
7 1.17 µSecs |
| signed int * | 42 7.00 µSecs |
42 7.00 µSecs |
42 7.00 µSecs |
| signed int / | 43 7.17 µSecs |
194 32.33 µSecs |
229 38.17 µSecs |
| signed int % | 43 7.17 µSecs |
194 32.33 µSecs |
229 38.17 µSecs |
| signed int >> | 15 2.50 µSecs |
67 11.17 µSecs |
120 20.00 µSecs |
| signed int << | 15 2.50 µSecs |
67 11.17 µSecs |
120 20.00 µSecs |
| abs () | 20 3.33 µSecs |
22 3.67 µSecs |
25 4.17 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 12 2.00 µSecs |
12 2.00 µSecs |
12 2.00 µSecs |
| unsigned long - | 13 2.17 µSecs |
13 2.17 µSecs |
13 2.17 µSecs |
| unsigned long * | 132 22.00 µSecs |
132 22.00 µSecs |
132 22.00 µSecs |
| unsigned long / | 253 42.17 µSecs |
260 43.33 µSecs |
319 53.17 µSecs |
| unsigned long % | 261 43.50 µSecs |
268 44.67 µSecs |
327 54.50 µSecs |
| unsigned long >> | 27 4.50 µSecs |
259 43.17 µSecs |
492 82.00 µSecs |
| unsigned long << | 27 4.50 µSecs |
259 43.17 µSecs |
492 82.00 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 12 2.00 µSecs |
12 2.00 µSecs |
12 2.00 µSecs |
| signed long - | 13 2.17 µSecs |
13 2.17 µSecs |
13 2.17 µSecs |
| signed long * | 132 22.00 µSecs |
132 22.00 µSecs |
132 22.00 µSecs |
| signed long / | 266 44.33 µSecs |
306 51.00 µSecs |
618 103.00 µSecs |
| signed long % | 274 45.67 µSecs |
314 52.33 µSecs |
626 104.33 µSecs |
| signed long >> | 27 4.50 µSecs |
259 43.17 µSecs |
492 82.00 µSecs |
| signed long << | 27 4.50 µSecs |
259 43.17 µSecs |
492 82.00 µSecs |
| labs () | 34 5.67 µSecs |
45 7.50 µSecs |
57 9.50 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 152 25.33 µSecs |
199 33.17 µSecs |
365 60.83 µSecs |
| float - | 136 22.67 µSecs |
201 33.50 µSecs |
334 55.67 µSecs |
| float * | 119 19.83 µSecs |
219 36.50 µSecs |
231 38.50 µSecs |
| float / | 659 109.83 µSecs |
895 149.17 µSecs |
1,074 179.00 µSecs |
| fmod () | 246 41.00 µSecs |
1,963 327.17 µSecs |
3,776 629.33 µSecs |
| modf () | 1,510 251.67 µSecs |
2,002 333.67 µSecs |
2,170 361.67 µSecs |
| fabs () | 28 4.67 µSecs |
29 4.83 µSecs |
31 5.17 µSecs |
| ceil () | 1,130 188.33 µSecs |
1,571 261.83 µSecs |
1,781 296.83 µSecs |
| floor () | 1,130 188.33 µSecs |
1,571 261.83 µSecs |
1,795 299.17 µSecs |
| pow () | 715 119.17 µSecs |
3,650 608.33 µSecs |
10,301 1,716.83 µSecs |
| sqrt () | 35 5.83 µSecs |
1,117 186.17 µSecs |
2,352 392.00 µSecs |
| exp () | 246 41.00 µSecs |
278 46.33 µSecs |
4,479 746.50 µSecs |
| log () | 40 6.67 µSecs |
2,006 334.33 µSecs |
4,222 703.67 µSecs |
| log10 () | 42 7.00 µSecs |
2,106 351.00 µSecs |
4,422 737.00 µSecs |
| sin () | 632 105.33 µSecs |
3,276 546.00 µSecs |
3,715 619.17 µSecs |
| cos () | 599 99.83 µSecs |
3,278 546.33 µSecs |
3,695 615.83 µSecs |
| tan () | 4,249 708.17 µSecs |
4,616 769.33 µSecs |
4,796 799.33 µSecs |
| asin () | 346 57.67 µSecs |
7,171 1,195.17 µSecs |
8,569 1,428.17 µSecs |
| acos () | 814 135.67 µSecs |
7,743 1,290.50 µSecs |
8,738 1,456.33 µSecs |
| atan () | 1,548 258.00 µSecs |
4,310 718.33 µSecs |
5,271 878.50 µSecs |
| atan2 () | 1,767 294.50 µSecs |
4,991 831.83 µSecs |
6,453 1,075.50 µSecs |
| sinh () | 2,802 467.00 µSecs |
10,773 1,795.50 µSecs |
11,753 1,958.83 µSecs |
| cosh () | 2,848 474.67 µSecs |
10,758 1,793.00 µSecs |
11,736 1,956.00 µSecs |
| tanh () | 10,239 1,706.50 µSecs |
10,894 1,815.67 µSecs |
12,768 2,128.00 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 |
98 16.33 µSecs |
478 79.67 µSecs |
1,113 185.50 µSecs |
| free () | 141 23.50 µSecs |
466 77.67 µSecs |
908 151.33 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 Small Memory Model, ROM(Large), and Optimization Level 8-SPEED.
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