mirror of https://github.com/ArduPilot/ardupilot
66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
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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