summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-05 20:08:50 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-05 20:08:50 +0000
commit79d342dc6bc04c3bc4c1141760ad6e241059b139 (patch)
tree1b3f0b34a8d1632d6104c8d9eee1142c41fc2d38 /bsd-user
parentstop dirty tracking just at the end of migration (Glauber Costa) (diff)
downloadqemu-kvm-79d342dc6bc04c3bc4c1141760ad6e241059b139.tar.gz
qemu-kvm-79d342dc6bc04c3bc4c1141760ad6e241059b139.tar.bz2
qemu-kvm-79d342dc6bc04c3bc4c1141760ad6e241059b139.zip
tcg/x86_64: optimize register allocation order
The beginning of the register allocation order list on the TCG x86_64 target matches the list of clobbered registers. This means that when an helper is called, there is almost always clobbered registers that have to be spilled. The same way register %rsi and %rdi are at the top of the register allocation order list, while they can't be used for load/store operations. This means the data and/or address registers are very often %rsi and %rdi, and their values have to be spilled, and then moved back to another register. This patches changes to the allocation order to avoid those effects. It results in a 8% gain speed in qemu-x86_64 to compress a bzip2 file, and a 6% gain in qemu-system-mips64 to compile a small application. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7003 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'bsd-user')
0 files changed, 0 insertions, 0 deletions