Hello,
I need to optimize a Linux program running under qemu-system-i386. qemu is compiled with KVM support. File /proc/cpuinfo in the guest shows that SSE2 is supported.
If SSE2 is backed with host hardware, using SSE2 may improve my program's performance significantly. The host is x86_64 Linux.
My question is: whether sse2 is backed with host hardware ? If it is, how much overhead does an SSE2 instruction have ? (comparing with an SSE2 instruction on the host)