[Stackless] New 3 platforms for Stackless Python

Christian Tismer tismer at tismer.com
Wed Mar 6 10:28:25 CET 2002


Russ Cox wrote:

>>How can we save&restore registers fast?


Another hint: The product description at
http://www.expresslogic.com/procTX-powerpc.html

says:
""" PowerPC Optimizations

ThreadX optimizes context switching on the PowerPC. When context 
switching occurs inside of a ThreadX service call, only the registers 
preserved across function calls are saved as part of the thread's 
context. This is typically registers r14-r31.

A similar technique is used in interrupt handling.On the front end of 
interrupt service routines, only the compiler's scratch registers are 
saved initially (typically r0 and r3-r12). The full register set is 
saved only if thread preemption is required.
"""

I think this is a good guideline.

ciao - chris

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