Hi, Good Day.
I am working on ARM7TDMI core processor from Analog Devices family (ADuC703x). I developed a preemptive scheduler on the same in ARM environment. The functionality of the same is fine and its working well. For the purpose of optimization, i migrated into thumb mode using Keil RV compiler option (by changing the code generation option to THUMB mode and the optimization level option to 3 in C/C++ tab of the target settings option).
After changing the settings my code size is reduced by 2 KB. But, the complete functionality of the software got changed.
Can anybody help me out to get out of this problem? Also, I would like to know why this kind of behavior is occurring... Please let me know your valuable suggesions.
Thanking you in anticipation, Ravi Kumar Desaraju.
Hi Mike, Thanks for your response.
I understand your point. But, I enabled the option "ARM to THUMB interworking" option in the C/C++ and ASM tabs from the target settings menu. I think, the compiler will automatically generate the corresponding code in generating the object.
Well, as you said, I am using many instructions in the assembly code like... MSR, MRS, PUSH and POP. As I conveyed in my previous message, I developed this code in ARM. ARM architecture doesn't support PUSH and POP instructions. By using the above mentioned option in the compiler (i.e. ARM/THUMB interworking), I observed the code in disassembly window and found that the compiler is internally changing the same. So, I did not modify my assembly code. Also, can you please suggest me any important areas in which I have to concentrate?
Thanks and Regards, Ravi Kumar Deasaraju.