Register Spilling

Ian Lance Taylor ian@wasabisystems.com
Wed Dec 10 14:58:00 GMT 2003


Umar Janjua <Umar.Janjua@cl.cam.ac.uk> writes:

> During register allocation , when certain virtual registers are decided to be 
> spilled to memory, is there a specific scheme/strategy on the basis of which 
> the spilled values are laid out on memory.

Well, yes and no.  The spilled values are put into the stack frame.
The space is allocated by calls to assign_stack_local().  But there is
no predictable ordering of the spilled pseudo-registers, if that is
what you mean.  The registers are spilled as needed as the compiler
works through the instructions.

Ian



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