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Postings from July 2002
On Thu, Jul 04, 2002 at 05:08:25PM -0400, Melvin Smith wrote:
> Since context switches are not the norm (and register/stack accesses _are_)
> we decided to use a memcpy to switch them rather than using a
> pointer to a context.
So, more than 2 kilobyte will be copied for each co-routine call?
(Save the caller context, restore the co-routine context, execute the
co-routine, save the co-routine context, restore the caller context.)
This looks rather expansive to me!
(Think about an iterator over a list, for instance.)
> Using a pointer would slow down the common cases
> of access due to an extra dereference.
>
> interpreter->ctx->int_reg.registers
Why not access them by:
ctx->int_reg.registers
and access the interpreter by:
ctx->interpreter
Then, there is no extra dereference for the common cases.
> and would also kill the current JIT design.
Because it assumes there is only one interpreter ?
It seems to me it would be just as efficient to keep the interpreter
pointer in a register, instead of hardcoding the address of the
interpreter.
-- Jerome
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