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Re: LTO remapping/deduction of machine modes of types/decls


On Mon, Jan 02, 2017 at 09:49:55PM +0300, Alexander Monakov wrote:
> On Mon, 2 Jan 2017, Jakub Jelinek wrote:
> > If the host has long double the same as double, sure, PTX can use its native
> > DFmode even for long double.  But otherwise, the storage must be
> > transferable between accelerator and host.
> 
> Hm, sorry, the 'must' is not obvious to me: is it known that the OpenMP ARB
> would find only this implementation behavior acceptable?

long double is not non-mappable type in the spec, so it is supposed to work.
The implementation may choose not to offload whenever it sees long
double/__float128/_Float128/_Float128x etc.

> Apart from floating-point types, are there other situations where modes carry
> information not deducible from the rest of the tree node?

Dunno about fixed types, partial ints etc., but it is mostly floating point
types, sure.

	Jakub


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