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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C251 Version 3 Operation Timings
X-Tiny Model
The following benchmarks provide a baseline for the execution speed of code generated by the Keil C251 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 + | 7 .88 µSecs |
7 .88 µSecs |
7 .88 µSecs |
| unsigned char - | 7 .88 µSecs |
7 .88 µSecs |
7 .88 µSecs |
| unsigned char * | 12 1.50 µSecs |
12 1.50 µSecs |
12 1.50 µSecs |
| unsigned char / | 17 2.13 µSecs |
17 2.13 µSecs |
17 2.13 µSecs |
| unsigned char % | 17 2.13 µSecs |
17 2.13 µSecs |
17 2.13 µSecs |
| unsigned char >> | 12 1.50 µSecs |
57 7.13 µSecs |
110 13.75 µSecs |
| unsigned char << | 12 1.50 µSecs |
51 6.38 µSecs |
96 12.00 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 7 .88 µSecs |
7 .88 µSecs |
7 .88 µSecs |
| signed char - | 7 .88 µSecs |
7 .88 µSecs |
7 .88 µSecs |
| signed char * | 12 1.50 µSecs |
12 1.50 µSecs |
12 1.50 µSecs |
| signed char / | 50 6.25 µSecs |
54 6.75 µSecs |
60 7.50 µSecs |
| signed char % | 50 6.25 µSecs |
54 6.75 µSecs |
60 7.50 µSecs |
| signed char >> | 12 1.50 µSecs |
51 6.38 µSecs |
96 12.00 µSecs |
| signed char << | 12 1.50 µSecs |
51 6.38 µSecs |
96 12.00 µSecs |
| cabs () | 26 3.25 µSecs |
30 3.75 µSecs |
34 4.25 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 10 1.25 µSecs |
10 1.25 µSecs |
10 1.25 µSecs |
| unsigned int - | 10 1.25 µSecs |
10 1.25 µSecs |
10 1.25 µSecs |
| unsigned int * | 21 2.63 µSecs |
21 2.63 µSecs |
21 2.63 µSecs |
| unsigned int / | 31 3.88 µSecs |
31 3.88 µSecs |
31 3.88 µSecs |
| unsigned int % | 31 3.88 µSecs |
31 3.88 µSecs |
31 3.88 µSecs |
| unsigned int >> | 15 1.88 µSecs |
60 7.50 µSecs |
113 14.13 µSecs |
| unsigned int << | 15 1.88 µSecs |
54 6.75 µSecs |
99 12.38 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 10 1.25 µSecs |
10 1.25 µSecs |
10 1.25 µSecs |
| signed int - | 10 1.25 µSecs |
10 1.25 µSecs |
10 1.25 µSecs |
| signed int * | 21 2.63 µSecs |
21 2.63 µSecs |
21 2.63 µSecs |
| signed int / | 66 8.25 µSecs |
73 9.13 µSecs |
80 10.00 µSecs |
| signed int % | 66 8.25 µSecs |
73 9.13 µSecs |
80 10.00 µSecs |
| signed int >> | 15 1.88 µSecs |
54 6.75 µSecs |
99 12.38 µSecs |
| signed int << | 15 1.88 µSecs |
60 7.50 µSecs |
113 14.13 µSecs |
| abs () | 28 3.50 µSecs |
31 3.88 µSecs |
35 4.38 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 20 2.50 µSecs |
20 2.50 µSecs |
20 2.50 µSecs |
| unsigned long - | 20 2.50 µSecs |
20 2.50 µSecs |
20 2.50 µSecs |
| unsigned long * | 72 9.00 µSecs |
72 9.00 µSecs |
72 9.00 µSecs |
| unsigned long / | 435 54.38 µSecs |
446 55.75 µSecs |
461 57.63 µSecs |
| unsigned long % | 435 54.38 µSecs |
446 55.75 µSecs |
461 57.63 µSecs |
| unsigned long >> | 21 2.63 µSecs |
189 23.63 µSecs |
387 48.38 µSecs |
| unsigned long << | 22 2.75 µSecs |
154 19.25 µSecs |
294 36.75 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 20 2.50 µSecs |
20 2.50 µSecs |
20 2.50 µSecs |
| signed long - | 20 2.50 µSecs |
20 2.50 µSecs |
20 2.50 µSecs |
| signed long * | 72 9.00 µSecs |
72 9.00 µSecs |
72 9.00 µSecs |
| signed long / | 470 58.75 µSecs |
500 62.50 µSecs |
533 66.63 µSecs |
| signed long % | 470 58.75 µSecs |
500 62.50 µSecs |
533 66.63 µSecs |
| signed long >> | 21 2.63 µSecs |
185 23.13 µSecs |
379 47.38 µSecs |
| signed long << | 22 2.75 µSecs |
154 19.25 µSecs |
294 36.75 µSecs |
| labs () | 37 4.63 µSecs |
42 5.25 µSecs |
47 5.88 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 166 20.75 µSecs |
250 31.25 µSecs |
354 44.25 µSecs |
| float - | 136 17.00 µSecs |
253 31.63 µSecs |
372 46.50 µSecs |
| float * | 143 17.88 µSecs |
194 24.25 µSecs |
207 25.88 µSecs |
| float / | 683 85.38 µSecs |
716 89.50 µSecs |
742 92.75 µSecs |
| modf () | 705 88.13 µSecs |
1,206 150.75 µSecs |
1,295 161.88 µSecs |
| fabs () | 35 4.38 µSecs |
35 4.38 µSecs |
36 4.50 µSecs |
| ceil () | 964 120.50 µSecs |
1,366 170.75 µSecs |
1,699 212.38 µSecs |
| floor () | 964 120.50 µSecs |
1,366 170.75 µSecs |
1,699 212.38 µSecs |
| pow () | 666 83.25 µSecs |
3,403 425.38 µSecs |
9,543 1,192.88 µSecs |
| sqrt () | 49 6.13 µSecs |
951 118.88 µSecs |
1,968 246.00 µSecs |
| exp () | 230 28.75 µSecs |
271 33.88 µSecs |
4,941 617.63 µSecs |
| log () | 53 6.63 µSecs |
1,850 231.25 µSecs |
3,857 482.13 µSecs |
| log10 () | 235 29.38 µSecs |
2,035 254.38 µSecs |
4,040 505.00 µSecs |
| sin () | 555 69.38 µSecs |
2,943 367.88 µSecs |
3,374 421.75 µSecs |
| cos () | 522 65.25 µSecs |
2,940 367.50 µSecs |
3,349 418.63 µSecs |
| tan () | 3,943 492.88 µSecs |
4,050 506.25 µSecs |
4,241 530.13 µSecs |
| asin () | 412 51.50 µSecs |
6,499 812.38 µSecs |
7,671 958.88 µSecs |
| acos () | 812 101.50 µSecs |
7,041 880.13 µSecs |
7,902 987.75 µSecs |
| atan () | 1,626 203.25 µSecs |
3,948 493.50 µSecs |
4,631 578.88 µSecs |
| atan2 () | 1,803 225.38 µSecs |
4,627 578.38 µSecs |
5,792 724.00 µSecs |
| sinh () | 2,390 298.75 µSecs |
10,129 1,266.13 µSecs |
10,765 1,345.63 µSecs |
| cosh () | 2,456 307.00 µSecs |
10,124 1,265.50 µSecs |
10,733 1,341.63 µSecs |
| tanh () | 9,279 1,159.88 µSecs |
10,228 1,278.50 µSecs |
11,577 1,447.13 µSecs |
Buffer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| memset (10) | 139 17.38 µSecs |
139 17.38 µSecs |
139 17.38 µSecs |
| memset (100) | 1,129 141.13 µSecs |
1,129 141.13 µSecs |
1,129 141.13 µSecs |
| memset (1000) | 11,029 1,378.63 µSecs |
11,029 1,378.63 µSecs |
11,029 1,378.63 µSecs |
| memcpy (10) | 192 24.00 µSecs |
192 24.00 µSecs |
192 24.00 µSecs |
| memcpy (100) | 1,632 204.00 µSecs |
1,632 204.00 µSecs |
1,632 204.00 µSecs |
| memcpy (1000) | 16,032 2,004.00 µSecs |
16,032 2,004.00 µSecs |
16,032 2,004.00 µSecs |
| memmove (10 with overlap) |
207 25.88 µSecs |
207 25.88 µSecs |
207 25.88 µSecs |
| memmove (100 with overlap) |
1,647 205.88 µSecs |
1,647 205.88 µSecs |
1,647 205.88 µSecs |
| memmove (1000 with overlap) |
16,047 2,005.88 µSecs |
16,047 2,005.88 µSecs |
16,047 2,005.88 µSecs |
Memory Allocation Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| malloc (), 99.7% successful |
56 7.00 µSecs |
250 31.25 µSecs |
642 80.25 µSecs |
| free () | 72 9.00 µSecs |
219 27.38 µSecs |
455 56.88 µSecs |
Note
- These tests were performed and measured using the µVision Debugger. Test code was compiled with the C251 Version 3.60 C Compiler using the X-Tiny Memory Model, 251-source mode, ROM(LARGE), and Optimization Level 7-SPEED.
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