On Tue, Jul 30, 2024 at 03:43:25PM +0300, Alexander Monakov wrote:
>
> On Tue, 30 Jul 2024, Richard Biener wrote:
>
> > > Oh, and please add a small comment why we don't use XFmode here.
> >
> > Will do.
> >
> > /* Do not enable XFmode, there is padding in it and it suffers
> > from normalization upon load like SFmode and DFmode when
> > not using SSE. */
>
> Is it really true? I have no evidence of FLDT performing normalization
> (as mentioned in PR 114659, if it did, there would be no way to spill/reload
> x87 registers).
>
> (the padding is not part of the 80-bit mode precision of XFmode, right?)
It is part of the mode (which has 12 or 16 byte size).
Though, the condition in the caller of the target hook should already
return false before calling this hook for the XFmode/XCmode modes exactly
becayse the precision doesn't match size.
Jakub
