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CodeBench Lite - ARM compilerproduce different object file for the same source file !!

Question asked by abdurahman.alfeky on Jun 12, 2013
Latest reply on Jun 17, 2013 by ricardo_anguiano

Using the GCC compiler for ARM (windows) :

arm-none-eabi-gcc.exe (Sourcery CodeBench Lite 2012.09-63) 4.7.2 version

I have got different object file produced every ~5 times i compiled the same source file.

The optimization level 3 is used (aggressive) is used, compiler options used:

-O3 -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -fshort-wchar  -fshort-enums  -funsafe-math-optimizations -mvectorize-with-neon-quad

The dump of the different object files shows too many differences in assembly instructions , registers and addresses used.

  • Is it normal that compiler optimize/compile exactly the same source file differently and produce different object files ?! is it a compiler bug ?

  • How to avoid this behavior without turning off aggressive optimization ?