Re: [PATCH] df: new option: --total (-c) to produce grand total (in the same way as du)

[Ralf Wildenhues]

Hello,

> Bruno Haible <address@hidden> wrote:
> > Jim Meyering wrote:
> >
> >>> Some of the changes (& => &&) are unconditional improvements, imho.
> >
> > I disagree. The & => && change inserts a conditional branch into the control
> > flow, with the potential to save a single memory access. I count ca. 2 CPU
> > cycles for a memory access and ca. 8 CPU cycles for a conditional jump,
> > therefore I would say that the change slows down the program a bit.

For what little it's worth, this code cycle argument does not take into
account the optimization features of recent GCC versions AFAIK.

Cheers,
Ralf