> This is interesting. I've quickly tried it out on the SH port. It can be
> accomplished with the combine pass, although there are a few things that
> should be taken care of:
> - an "extendsidi2" pattern is required (so that the extension is not
> performed before expand)
> ...
> One potentia
Hi Jon,
I'd like to try to optimise double word left shifts of sign/zero
extended
operands if a widening multiply instruction is available. For the
following
code:
long long f(long a, long b)
{
return (long long)a << b;
}
I'd like to optimise this to something like:
(long long) a * (
On Thu, 2012-07-26 at 10:51 -0700, Ian Lance Taylor wrote:
> On Thu, Jul 26, 2012 at 8:57 AM, Jon Beniston
> wrote:
> >
> > I'd like to try to optimise double word left shifts of sign/zero extended
> > operands if a widening multiply instruction is available. For the following
> > code:
> >
> > l
On Thu, Jul 26, 2012 at 8:57 AM, Jon Beniston wrote:
>
> I'd like to try to optimise double word left shifts of sign/zero extended
> operands if a widening multiply instruction is available. For the following
> code:
>
> long long f(long a, long b)
> {
> return (long long)a << b;
> }
>
> ARM, MI
