[Qemu-devel] env in TLS

[Piotr Krysik]

Hi!

Fabrice, how about moving env variable to TLS?

This could improve performance (based on 
http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00294.html

about 10% could be gained -- need to verify). Also 
additional register would be available for op.c 
(anyone to implement register renaming?).

The main problem with this approach is portability. 
AFAIK GCC <= 3.2 doesn't recognize __thread keyword. 
For x86 we could fall-back to the LDT method from 
qemu-fast. How about other platforms? In the worst 
case we could use global variable and forget about 
multi-processor qemu-softmmu and multi-thread in 
qemu-user for some platforms in the future.


Comments?

Piotrek


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