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Assembler change immediate value of one assembly instruction

jucimar

I am using the KEIL MDK-5, assembly. The project compiles without some problems, but when i see the disassembly the assembler change the inmediate value

Assembler substitute one instruction for another

My code:

The instruction: SUBS    R2,#0xC7

the assembler: 0x000006BC 3A00      SUBS     r2,r2,#0x00

When it changes the immediate 0xC7 change all results of my process.

Somebody saw something simlar?