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Register Variable

hi
i want to migrate from arm compiler 5 to 6

compiler 5 uses for following local variable a register (e.g. r0) register unsigned long len;

compiler 6 does not
why?
which keyword should i use therefore

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  • A compiler's use of processor registers is an entirely internal matter of the specific implementation.

    Why does this matter to you?

    If it really does matter, then you should probably be writing in assembler - not a high-level language.

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  • A compiler's use of processor registers is an entirely internal matter of the specific implementation.

    Why does this matter to you?

    If it really does matter, then you should probably be writing in assembler - not a high-level language.

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