Re: [Qemu-devel] [PATCH 03/18] target-ppc: Add ISA2.06 divdeu[o] Instructions

[Richard Henderson]

On 12/09/2013 07:47 AM, Tom Musta wrote:
> This patch adds the Divide Doubleword Extended Unsigned
> instructions.  This instruction requires dividing a 128-bit
> value by a 64 bit value.  Since 128 bit integer division is
> not supported in TCG, a helper is used, providing a
> repeated difference algorithm.

It's long past time we provided this generically.

There's a (slightly) better algorithm than this in target-i386/int_helper.c.
Extra points for stealing the (much) better algorithm from gcc's libgcc2.c.

This ought to go in "host-utils.h" next to mul[us]64.


r~