CODEWITHSUNDEEP
cembeddedmicrochipxc8mplab-x
RoMoTronic
RoMoTronic

Reputation: 11

Microchip XC8 - Unexpected data memory increase after deletion of variable

I am currently optimising and streamlining development code in preparation for release. Hardware and compiler specifics as follows:

PIC18F46J11, MPLABX, XC8 - V2.45, C99, Optimization level 1

See below (heavily truncated(I.P)) code of area of interest.

DEV CODE:

    unsigned long Adc18;
    unsigned long ReadAdc;
    unsigned long AvgAdc;

    ReadAdc=Adc18;
    AvgAdc = AvgAdc + ReadAdc;

Estimated memory usage: 2988 bytes DATA (RAM), 57753 bytes PROGRAM (ROM)

STREAMLINED CODE:

    unsigned long Adc18;
    unsigned long AvgAdc;

    AvgAdc = AvgAdc + Adc18;

Estimated memory usage: 3022 bytes DATA (RAM), 57651 bytes PROGRAM (ROM)

Question: What could cause the DATA usage increase in a scenario such as this? I expected PROGRAM memory to decrease as we have both removed a variable of type long and associated code.

This is my first question on this platform so please forgive any errors in formatting.

Thanks in advance!

Upvotes: 1

Views: 48

Answers (0)

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