https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #18 from Oleg Endo ---
A rather recent case and request to add a __builtin_fipr function, when trying
to optimize quaternion multiplication. This one includes hand-written inline
asm and register pre-allocation.
https://godbolt.org/
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #17 from Oleg Endo ---
(In reply to Luke Benstead from comment #16)
> OK so perhaps adding __builtin_sh_fipr is a good first step?
Yeah, you can try and see if it produces any useful results for you.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #16 from Luke Benstead ---
OK so perhaps adding __builtin_sh_fipr is a good first step?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #15 from Oleg Endo ---
It's been too long since I've looked into it. Maybe some middle-end parts got
more suitable over the time, but it was difficult to make it generate the fipr
instruction automatically due to the reasons stated a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
Luke Benstead changed:
What|Removed |Added
CC||kazade at gmail dot com
--- Comment #14
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--- Comment #13 from Oleg Endo ---
(In reply to Manu Evans from comment #12)
> Hey, I'm still following this with great interest.
>
> Is it possible to make an intrinsic for this instruction so it can be issued
> at will?
Yes, that's what I wan
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #12 from Manu Evans ---
Hey, I'm still following this with great interest.
Is it possible to make an intrinsic for this instruction so it can be issued at
will?
What I'm still more interested in at this point, would be some support
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #11 from Oleg Endo ---
A note on the side...
As mentioned above, fipr can also be used to do a 3D dot product. However,
GCC's vector extensions do not allow specifying vectors of length 3. To
support that I guess the easiest way is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #10 from Oleg Endo ---
(In reply to Oleg Endo from comment #9)
> Created attachment 34213 [details]
> Combine patterns for matching fipr
>
> An updated patch for trunk. As for the redundant fp moves and/or ferries
> through fpul, th
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
Oleg Endo changed:
What|Removed |Added
Attachment #28671|0 |1
is obsolete|
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #8 from Oleg Endo 2013-03-13 18:21:37
UTC ---
(In reply to comment #5)
>
> This is another reason for adding a new ABI, BTW.
Just for the record, I've opened a new PR 56592 for this.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #7 from Oleg Endo 2013-03-06 01:05:14
UTC ---
(In reply to comment #5)
> >
> > I'm also noticing that -ffast-math is inhibiting fmac emission in some
> > cases:
> >
> > Compiled with: -O3 -mfused-madd -ffast-math
> >
>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #6 from Manu Evans 2013-03-05 12:53:26
UTC ---
Awesome, thanks for the info and help!
Strange -m4-single won't work with my toolchain, it says 'not compatible with
this configuration' >_<
Looking forward to all these fixes
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #5 from Oleg Endo 2013-03-05 12:28:22
UTC ---
(In reply to comment #4)
>
> Why is a new ABI important?
>
Because currently, there is no way to pass something like
struct { float x, y, z, w };
as function arguments i
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #4 from Manu Evans 2013-03-05 01:55:08
UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> > +1
> >
> > I'm seeing the same pattern.
> > Infact, I'm noticing a lot of my maths code seems to be performing a lot of
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #3 from Oleg Endo 2013-03-04 21:50:58
UTC ---
(In reply to comment #2)
> +1
>
> I'm seeing the same pattern.
> Infact, I'm noticing a lot of my maths code seems to be performing a lot of
> redundant moves.
Some examples
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
Manu Evans changed:
What|Removed |Added
CC||turkeyman at gmail dot com
--- Com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55295
--- Comment #1 from Oleg Endo 2012-11-12 22:39:27
UTC ---
I forgot to mention that at least there should be a target specific built-in
function to generate the fipr insn. There is already a SHmedia built-in for
that, so adding one for SH4
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