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Hi,
We are working on STM32G070 micro-controller. Our code size is approximately 75KB. We are using Embedded C++ language, Keil uvision version 5 with code optimization level 2.
We were trying to reduce the code size and we observed some strange things during compilation as below.
1. If I remove one function call from a function, the code size is increased by over 100 Bytes.
Expected: Removing one function call inside a function shall reduce the code size.
2. if we add a function call, code size is increased by over 100 bytes.
Expected: Code size shall be increased by maximum 10-20 bytes only as this function call was already made earlier from other functions in same file.
Do you know the reason for the above strange behavior?
Why guess? Use tools that examine the binary (objdump, nm, etc), and/or the output from the various build steps (linker map, assembly listing) and figure out exactly where the extra space is going.