Re: PATCH: Enable TFmode for SSE2

[Uros Bizjak <ubizjak at gmail dot com>]

Richard Guenther wrote:

> > You can create a TImode/TFmode sign bitmask via CONST_VECTOR, just look at
> > ix86_build_const_vector for an example. TFmode mask is currently created as
> > CONST_DOUBLE just because 128bit modes were enabled for 64bit targets only
> > and this was the simplest way ;)
> >
> > And we will again avoid 64bit HWI.
> >     
>
> Why not simply use 64bit HWI on i?86?
>   
I'm worried a bit about compile times on 32bit hosts. Please note that 
not everybody has 2^N-core 64bit gear to play with. OTOH, I don't recall 
if anybody measured bootstrap time with 64bit HWI on 32bit target yet. 
This is the data we need to consider before enabling 64bit HWI.

Also note, that 128bit constants can be decomposed to a const vector and 
loaded from memory as CONST_VECTOR.

Uros.