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GitHub Repository: Ardupilot/ardupilot
 Path: blob/master/Tools/CPUInfo/output.txt
Views: 1798
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Type sizes:

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char      : 1

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short     : 2

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int       : 2

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long      : 4

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long long : 8

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bool      : 1

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void*     : 2

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Operation timings:

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Note: timings for some operations are very data dependent

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nop           0.07 usec/call

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cli/sei       0.14 usec/call

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micros()      3.17 usec/call

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millis()      1.47 usec/call

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fadd          9.18 usec/call

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fsub          9.25 usec/call

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fmul          7.96 usec/call

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fdiv          7.96 usec/call

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dadd          9.18 usec/call

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dsub          9.25 usec/call

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dmul          6.14 usec/call

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ddiv          6.07 usec/call

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sin()       112.35 usec/call

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cos()       113.11 usec/call

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tan()       154.92 usec/call

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acos()      167.69 usec/call

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asin()       82.16 usec/call

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atan2()     193.34 usec/call

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sqrt()       31.67 usec/call

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iadd8         0.48 usec/call

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isub8         0.48 usec/call

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imul8         0.67 usec/call

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idiv8         5.57 usec/call

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iadd16        0.92 usec/call

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isub16        0.92 usec/call

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imul16        1.42 usec/call

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idiv16       13.31 usec/call

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iadd32        1.80 usec/call

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isub32        1.80 usec/call

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imul32        4.69 usec/call

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idiv32       37.89 usec/call

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iadd64        7.96 usec/call

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isub64        8.53 usec/call

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imul64       45.82 usec/call

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idiv64      230.95 usec/call

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memcpy128    56.76 usec/call

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memset128    49.84 usec/call

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delay(1)   1007.65 usec/call

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Additional notes:

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 eeprom_read_byte: 2 usec/call

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 eeprom_write_byte: first call costs 5 usec, each subsequent byte

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                    costs 3480 usec as it waits for the EEPROM to be

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                    ready from the previous byte

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 pgm_read_byte: 0.5 usec per byte

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dataflash write: 

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  50 usec per byte, same on APM1 and APM2

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  if we change API to do block writes, will be 8 usec per byte

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