On Mon, Jul 26, 2021 at 1:27 PM Roger Sayle wrote:
>
>
> The following patch to the x86_64 backend improves the code generated
> for a decrement followed by a conditional move. The primary change is
> to recognize that after subtracting one, checking the result is -1 (or
> equivalently that the o
The following patch to the x86_64 backend improves the code generated
for a decrement followed by a conditional move. The primary change is
to recognize that after subtracting one, checking the result is -1 (or
equivalently that the original value was zero) can be implemented using
the borrow/car
