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Code size variation in compiler 5 versions

Hi,

When compiling my code in Keil5, I get different code sizes when using compiler V5.03 and V5.06.

Using V5.03 - default compiler used in Keil4- my code size is:  Total RW  Size (RW Data + ZI Data)             30240 (  29.53kB)

Using V5.06 - default compiler used in Keil5- my code size is: Total RW  Size (RW Data + ZI Data)             49096 (  47.95kB)

A difference of 18.42KB. My target device is TM4C123FH6PM, and is has only 32KB of RAM, so this difference is huge!

With both compilers no optimization was used (level 0).

Why is the code size that different with the different compilers?

TIA,

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