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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C166 Version 5 Operation Timings
XC16x 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 + | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| unsigned char - | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| unsigned char * | 7 .35 µSecs |
7 .35 µSecs |
7 .35 µSecs |
| unsigned char / | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| unsigned char % | 9 .45 µSecs |
9 .45 µSecs |
9 .45 µSecs |
| unsigned char >> | 6 .30 µSecs |
6 .30 µSecs |
6 .30 µSecs |
| unsigned char << | 5 .25 µSecs |
5 .25 µSecs |
5 .25 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| signed char - | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| signed char * | 7 .35 µSecs |
7 .35 µSecs |
7 .35 µSecs |
| signed char / | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| signed char % | 9 .45 µSecs |
9 .45 µSecs |
9 .45 µSecs |
| signed char >> | 6 .30 µSecs |
6 .30 µSecs |
6 .30 µSecs |
| signed char << | 5 .25 µSecs |
5 .25 µSecs |
5 .25 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| unsigned int - | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| unsigned int * | 5 .25 µSecs |
5 .25 µSecs |
5 .25 µSecs |
| unsigned int / | 6 .30 µSecs |
6 .30 µSecs |
6 .30 µSecs |
| unsigned int % | 7 .35 µSecs |
7 .35 µSecs |
7 .35 µSecs |
| unsigned int >> | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| unsigned int << | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| signed int - | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| signed int * | 5 .25 µSecs |
5 .25 µSecs |
5 .25 µSecs |
| signed int / | 6 .30 µSecs |
6 .30 µSecs |
6 .30 µSecs |
| signed int % | 7 .35 µSecs |
7 .35 µSecs |
7 .35 µSecs |
| signed int >> | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| signed int << | 4 .20 µSecs |
4 .20 µSecs |
4 .20 µSecs |
| abs () | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| unsigned long - | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| unsigned long * | 15 .75 µSecs |
15 .75 µSecs |
15 .75 µSecs |
| unsigned long / | 39 1.95 µSecs |
39 1.95 µSecs |
43 2.15 µSecs |
| unsigned long % | 39 1.95 µSecs |
39 1.95 µSecs |
43 2.15 µSecs |
| unsigned long >> | 8 .40 µSecs |
13 .65 µSecs |
16 .80 µSecs |
| unsigned long << | 8 .40 µSecs |
13 .65 µSecs |
16 .80 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| signed long - | 8 .40 µSecs |
8 .40 µSecs |
8 .40 µSecs |
| signed long * | 15 .75 µSecs |
15 .75 µSecs |
15 .75 µSecs |
| signed long / | 46 2.30 µSecs |
53 2.65 µSecs |
61 3.05 µSecs |
| signed long % | 46 2.30 µSecs |
53 2.65 µSecs |
61 3.05 µSecs |
| signed long >> | 8 .40 µSecs |
13 .65 µSecs |
16 .80 µSecs |
| signed long << | 8 .40 µSecs |
13 .65 µSecs |
16 .80 µSecs |
| labs () | 14 .70 µSecs |
15 .75 µSecs |
16 .80 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 58 2.90 µSecs |
74 3.70 µSecs |
132 6.60 µSecs |
| float - | 47 2.35 µSecs |
75 3.75 µSecs |
133 6.65 µSecs |
| float * | 64 3.20 µSecs |
67 3.35 µSecs |
71 3.55 µSecs |
| float / | 81 4.05 µSecs |
84 4.20 µSecs |
88 4.40 µSecs |
| fmod () | 220 11.00 µSecs |
299 14.95 µSecs |
411 20.55 µSecs |
| modf () | 169 8.45 µSecs |
284 14.20 µSecs |
310 15.50 µSecs |
| fabs () | 51 2.55 µSecs |
51 2.55 µSecs |
53 2.65 µSecs |
| ceil () | 289 14.45 µSecs |
369 18.45 µSecs |
392 19.60 µSecs |
| floor () | 289 14.45 µSecs |
369 18.45 µSecs |
391 19.55 µSecs |
| pow () | 177 8.85 µSecs |
1,099 54.95 µSecs |
3,716 185.80 µSecs |
| sqrt () | 13 .65 µSecs |
43 2.15 µSecs |
77 3.85 µSecs |
| exp () | 84 4.20 µSecs |
96 4.80 µSecs |
1,622 81.10 µSecs |
| log () | 12 .60 µSecs |
637 31.85 µSecs |
1,526 76.30 µSecs |
| log10 () | 47 2.35 µSecs |
686 34.30 µSecs |
1,591 79.55 µSecs |
| sin () | 432 21.60 µSecs |
1,091 54.55 µSecs |
1,501 75.05 µSecs |
| cos () | 402 20.10 µSecs |
1,092 54.60 µSecs |
1,508 75.40 µSecs |
| tan () | 1,392 69.60 µSecs |
1,521 76.05 µSecs |
1,955 97.75 µSecs |
| asin () | 178 8.90 µSecs |
1,470 73.50 µSecs |
1,925 96.25 µSecs |
| acos () | 519 25.95 µSecs |
1,578 78.90 µSecs |
1,921 96.05 µSecs |
| atan () | 686 34.30 µSecs |
1,222 61.10 µSecs |
1,645 82.25 µSecs |
| atan2 () | 617 30.85 µSecs |
1,359 67.95 µSecs |
1,777 88.85 µSecs |
| sinh () | 1,623 81.15 µSecs |
3,546 177.30 µSecs |
4,534 226.70 µSecs |
| cosh () | 1,678 83.90 µSecs |
3,543 177.15 µSecs |
4,530 226.50 µSecs |
| tanh () | 3,190 159.50 µSecs |
3,467 173.35 µSecs |
4,496 224.80 µSecs |
Buffer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| memset (10) | 47 2.35 µSecs |
47 2.35 µSecs |
47 2.35 µSecs |
| memset (100) | 407 20.35 µSecs |
407 20.35 µSecs |
407 20.35 µSecs |
| memset (1000) | 4,007 200.35 µSecs |
4,007 200.35 µSecs |
4,007 200.35 µSecs |
| memcpy (10) | 46 2.30 µSecs |
46 2.30 µSecs |
46 2.30 µSecs |
| memcpy (100) | 406 20.30 µSecs |
406 20.30 µSecs |
406 20.30 µSecs |
| memcpy (1000) | 4,006 200.30 µSecs |
4,006 200.30 µSecs |
4,006 200.30 µSecs |
| memmove (10 with overlap) |
100 5.00 µSecs |
100 5.00 µSecs |
100 5.00 µSecs |
| memmove (100 with overlap) |
820 41.00 µSecs |
820 41.00 µSecs |
820 41.00 µSecs |
| memmove (1000 with overlap) |
8,020 401.00 µSecs |
8,020 401.00 µSecs |
8,020 401.00 µSecs |
Memory Allocation Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| malloc (), 99.5% successful |
36 1.80 µSecs |
148 7.40 µSecs |
390 19.50 µSecs |
| free () | 43 2.15 µSecs |
176 8.80 µSecs |
379 18.95 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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