register allocation

[stefanodimasci1]

Hello,

I need to be sure that a register won't be used during register allocation in GCC because I need it for some assembly level checks. Does anybody know what kind of directive I have to put in codewarrior?

Thank you.

[trytohelp]

Hi Stefano,

Can you please let me know what is the development tool chain you're using and the Processor ?

Have a great day,
Pascal
NXP Technical Support

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[stefanodimasci1]

I'm using the deafult GNU toolchain on codewarrior for the MPC5643L.

[trytohelp · Accepted solution]

Hi Stefano,

You're using CW for MCU v10.6 for MPC56XX.

Now If I understand correctly you request, you want to reserve a register.

I've found a note  explaining how to do that in the \CW MCU v10.6.4\MCU\Help\PDF\MCU_Power-Architecture_Compiler.pdf manual.

Please have a look pages 258 - 261

     14.2 Additional Small Data Sections

Have a great day,
Pascal
NXP Technical Support

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