On 03/24/2010 05:47 PM, Paul Brook wrote:
Actually, Anthony suggested at some point to just use 64 bits for
TARGET_PHYS_ADDR_BITS and remove the need for hw32/64.
I think that people emulationg 32bits on 32bits would suffer, but have
no clue how much. Anthony, what was the idea?
Sacrificing runtime performance to avoid rebuilding a few files is not
acceptable. I consider the fact that TARGET_PHYS_ADDR_BITS is always 64 on 64-
bit hosts is a bug. It's just hard to fix, and probably even less of a
performance hit, so I haven't bothered yet.
It's a statement of correctness really. Devices should never deal with
target_phys_addr_t's.
The question is, should a pci_addr_t or a sysbus_addr_t be 64 bit or
should it be 32-bit on 32-bit platforms. Honestly, I am extremely
sceptical that there would be any measurable performance difference.
Regards,
Anthony Liguori
Paul
