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Benchmarks
C51 Benchmarks
C251 Benchmarks
XC16x/C16x/ST10 Benchmarks
C51 Version 7 Operation Timings
Compact 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 + | 11 1.83 µSecs | 11 1.83 µSecs | 11 1.83 µSecs |
| unsigned char - | 12 2.00 µSecs | 12 2.00 µSecs | 12 2.00 µSecs |
| unsigned char * | 16 2.67 µSecs | 16 2.67 µSecs | 16 2.67 µSecs |
| unsigned char / | 16 2.67 µSecs | 16 2.67 µSecs | 16 2.67 µSecs |
| unsigned char % | 17 2.83 µSecs | 17 2.83 µSecs | 17 2.83 µSecs |
| unsigned char >> | 18 3.00 µSecs | 48 8.00 µSecs | 78 13.00 µSecs |
| unsigned char << | 18 3.00 µSecs | 48 8.00 µSecs | 78 13.00 µSecs |
Signed Character Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed char + | 11 1.83 µSecs | 11 1.83 µSecs | 11 1.83 µSecs |
| signed char - | 12 2.00 µSecs | 12 2.00 µSecs | 12 2.00 µSecs |
| signed char * | 16 2.67 µSecs | 16 2.67 µSecs | 16 2.67 µSecs |
| signed char / | 28 4.67 µSecs | 35 5.83 µSecs | 40 6.67 µSecs |
| signed char % | 31 5.17 µSecs | 38 6.33 µSecs | 43 7.17 µSecs |
| signed char >> | 18 3.00 µSecs | 48 8.00 µSecs | 78 13.00 µSecs |
| signed char << | 18 3.00 µSecs | 48 8.00 µSecs | 78 13.00 µSecs |
| cabs () | 20 3.33 µSecs | 21 3.50 µSecs | 22 3.67 µSecs |
Unsigned Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned int + | 22 3.67 µSecs | 22 3.67 µSecs | 22 3.67 µSecs |
| unsigned int - | 23 3.83 µSecs | 23 3.83 µSecs | 23 3.83 µSecs |
| unsigned int * | 54 9.00 µSecs | 54 9.00 µSecs | 54 9.00 µSecs |
| unsigned int / | 174 29.00 µSecs | 177 29.50 µSecs | 204 34.00 µSecs |
| unsigned int % | 174 29.00 µSecs | 177 29.50 µSecs | 204 34.00 µSecs |
| unsigned int >> | 28 4.67 µSecs | 80 13.33 µSecs | 133 22.17 µSecs |
| unsigned int << | 28 4.67 µSecs | 80 13.33 µSecs | 133 22.17 µSecs |
Signed Integer Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed int + | 22 3.67 µSecs | 22 3.67 µSecs | 22 3.67 µSecs |
| signed int - | 23 3.83 µSecs | 23 3.83 µSecs | 23 3.83 µSecs |
| signed int * | 54 9.00 µSecs | 54 9.00 µSecs | 54 9.00 µSecs |
| signed int / | 55 9.17 µSecs | 206 34.33 µSecs | 241 40.17 µSecs |
| signed int % | 55 9.17 µSecs | 206 34.33 µSecs | 241 40.17 µSecs |
| signed int >> | 28 4.67 µSecs | 80 13.33 µSecs | 133 22.17 µSecs |
| signed int << | 28 4.67 µSecs | 80 13.33 µSecs | 133 22.17 µSecs |
| abs () | 28 4.67 µSecs | 30 5.00 µSecs | 33 5.50 µSecs |
Unsigned Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| unsigned long + | 65 10.83 µSecs | 65 10.83 µSecs | 65 10.83 µSecs |
| unsigned long - | 68 11.33 µSecs | 68 11.33 µSecs | 68 11.33 µSecs |
| unsigned long * | 161 26.83 µSecs | 161 26.83 µSecs | 161 26.83 µSecs |
| unsigned long / | 286 47.67 µSecs | 293 48.83 µSecs | 352 58.67 µSecs |
| unsigned long % | 294 49.00 µSecs | 301 50.17 µSecs | 360 60.00 µSecs |
| unsigned long >> | 52 8.67 µSecs | 284 47.33 µSecs | 517 86.17 µSecs |
| unsigned long << | 52 8.67 µSecs | 284 47.33 µSecs | 517 86.17 µSecs |
Signed Long Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| signed long + | 65 10.83 µSecs | 65 10.83 µSecs | 65 10.83 µSecs |
| signed long - | 68 11.33 µSecs | 68 11.33 µSecs | 68 11.33 µSecs |
| signed long * | 161 26.83 µSecs | 161 26.83 µSecs | 161 26.83 µSecs |
| signed long / | 299 49.83 µSecs | 339 56.50 µSecs | 651 108.50 µSecs |
| signed long % | 307 51.17 µSecs | 347 57.83 µSecs | 659 109.83 µSecs |
| signed long >> | 52 8.67 µSecs | 284 47.33 µSecs | 517 86.17 µSecs |
| signed long << | 52 8.67 µSecs | 284 47.33 µSecs | 517 86.17 µSecs |
| labs () | 86 14.33 µSecs | 93 15.50 µSecs | 101 16.83 µSecs |
Floating-Point Operations
| Operation | Min | Avg | Max |
|---|---|---|---|
| float + | 181 30.17 µSecs | 228 38.00 µSecs | 394 65.67 µSecs |
| float - | 169 28.17 µSecs | 234 39.00 µSecs | 367 61.17 µSecs |
| float * | 148 24.67 µSecs | 248 41.33 µSecs | 260 43.33 µSecs |
| float / | 692 115.33 µSecs | 928 154.67 µSecs | 1,107 184.50 µSecs |
| fmod () | 380 63.33 µSecs | 2,179 363.17 µSecs | 4,063 677.17 µSecs |
| modf () | 1,642 273.67 µSecs | 2,134 355.67 µSecs | 2,302 383.67 µSecs |
| fabs () | 48 8.00 µSecs | 49 8.17 µSecs | 51 8.50 µSecs |
| ceil () | 1,244 207.33 µSecs | 1,703 283.83 µSecs | 1,930 321.67 µSecs |
| floor () | 1,244 207.33 µSecs | 1,702 283.67 µSecs | 1,945 324.17 µSecs |
| pow () | 865 144.17 µSecs | 3,828 638.00 µSecs | 10,506 1,751.00 µSecs |
| sqrt () | 55 9.17 µSecs | 1,159 193.17 µSecs | 2,416 402.67 µSecs |
| exp () | 266 44.33 µSecs | 298 49.67 µSecs | 4,499 749.83 µSecs |
| log () | 60 10.00 µSecs | 2,063 343.83 µSecs | 4,317 719.50 µSecs |
| log10 () | 62 10.33 µSecs | 2,164 360.67 µSecs | 4,517 752.83 µSecs |
| sin () | 677 112.83 µSecs | 3,308 551.33 µSecs | 3,760 626.67 µSecs |
| cos () | 619 103.17 µSecs | 3,310 551.67 µSecs | 3,740 623.33 µSecs |
| tan () | 4,319 719.83 µSecs | 4,686 781.00 µSecs | 4,866 811.00 µSecs |
| asin () | 366 61.00 µSecs | 7,295 1,215.83 µSecs | 8,699 1,449.83 µSecs |
| acos () | 859 143.17 µSecs | 7,867 1,311.17 µSecs | 8,868 1,478.00 µSecs |
| atan () | 1,593 265.50 µSecs | 4,387 731.17 µSecs | 5,357 892.83 µSecs |
| atan2 () | 1,938 323.00 µSecs | 5,175 862.50 µSecs | 6,661 1,110.17 µSecs |
| sinh () | 2,858 476.33 µSecs | 10,829 1,804.83 µSecs | 11,809 1,968.17 µSecs |
| cosh () | 2,904 484.00 µSecs | 10,814 1,802.33 µSecs | 11,792 1,965.33 µSecs |
| tanh () | 10,367 1,727.83 µSecs | 11,022 1,837.00 µSecs | 12,896 2,149.33 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 | 160 26.67 µSecs | 694 115.67 µSecs | 1,571 261.83 µSecs |
| free () | 225 37.50 µSecs | 833 138.83 µSecs | 1,665 277.50 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 Compact Memory Model, ROM(Large), and Optimization Level 8-SPEED.
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