Re: [Qemu-devel] [PATCH 2/2] qemu-common.h: optimise muldiv64 for x86_64 architecture

[Peter Maydell]

On 9 January 2015 at 16:08, Frediano Ziglio <address@hidden> wrote:
> I agree (after some digging) we are not sure we won't get that
> overflow. Agree to drop the second patch. However I would retain the
> first. Compiler can use it to optimize much easier. For instance if
> compiler understand that the multiplication fits into a 64 bit can
> decide to avoid the 128 bit operation easily, not so easy with all
> these shift, multiply, division and union structure.

Yes, the uint128_t patch is a good idea.

-- PMM