On Wed, 2020-08-26 at 12:19 +0100, Roger Sayle wrote:
> Hi Dave,
>
> > This change is also fine.
> >
> > The gcc.target/hppa/shadd-2.c test now fails because there are two
> additional sh1add instructions.
> > However, the total number of instructions is the same as before.
>
> Just to be on
Hi Dave,
> This change is also fine.
>
> The gcc.target/hppa/shadd-2.c test now fails because there are two
additional sh1add instructions.
> However, the total number of instructions is the same as before.
Just to be on the safe side, I took a deeper look into this.
We're now generating a
On 2020-08-21 2:41 p.m., Roger Sayle wrote:
> 2020-08-21 Roger Sayle
>
> gcc/ChangeLog
> PR middle-end/87256
> * config/pa/pa.c (hppa_rtx_costs_shadd_p): New helper function
> to check for coefficients supported by shNadd and shladd,l.
> (hppa_rtx_costs): Rewrite to
This is my proposed fix to PR middle-end/87256 where synth_mult takes an
unreasonable amount of CPU time determining an optimal sequence of
instructions to perform multiplications by (large) integer constants on
hppa.
One workaround, proposed in bugzilla, is to increase the hash table used
to
