Arm Development Studio forum Concept of Scratch and Preserved Registers

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Concept of Scratch and Preserved Registers

Hi,

I am confused in understanding the difference between scratch and preserved registers. I have read the development guide of IAR Embedded Workbench but the topic was written in such a way that I could not get the real sence of it.
Any help or if possible some example that can help me differenciating between the both will be regarded.

Thanks in advance

Top replies

Martin Weidmann over 12 years ago +1

Note: This was originally posted on 5th April 2011 at http://forums.arm.com I've not used IAR's tools, but I'm assuming it follows the AAPCS (Procedure Call Standard for the ARM Architecture). The AAPCS...