Displaying 5 results from an estimated 5 matches for "expandunalignedstor".
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expandunalignedstore
2013 Jul 19
4
[LLVMdev] Disable vectorization for unaligned data
What is the proper solution to disable auto-vectorization for unaligned
data?
I have an out of tree target and I added this:
bool OpusTargetLowering::allowsUnalignedMemoryAccesses(EVT VT, bool *Fast)
const {
if (VT.isVector())
return false;
....
}
After that, I could see that vectorization is still done on unaligned data
except that llvm will copy the data back and forth from the source
2013 Jul 19
0
[LLVMdev] Disable vectorization for unaligned data
On Fri, Jul 19, 2013 at 1:14 PM, Francois Pichet <pichet2000 at gmail.com> wrote:
>
> What is the proper solution to disable auto-vectorization for unaligned
> data?
Why are you trying to do this? If auto-vectorization is making a
given loop slower on your target, that means the cost metrics are off,
and we should fix them. If code size is an issue, you should tell the
optimizer
2013 Jul 21
2
[LLVMdev] Disable vectorization for unaligned data
Ok any quick workaround to limit vectorization to 16-byte aligned 128-bit
data then?
All the memory copying done by ExpandUnalignedStore/ExpandUnalignedLoad is
just too expensive.
On Sat, Jul 20, 2013 at 12:52 PM, Arnold Schwaighofer <
aschwaighofer at apple.com> wrote:
>
> On Jul 19, 2013, at 3:14 PM, Francois Pichet <pichet2000 at gmail.com> wrote:
>
> >
> > What is the proper solution to disab...
2013 Jul 21
0
[LLVMdev] Disable vectorization for unaligned data
...to work on this soon as ARM also has pretty inefficient unaligned vector loads.
On Jul 21, 2013, at 9:29 AM, Francois Pichet <pichet2000 at gmail.com> wrote:
> Ok any quick workaround to limit vectorization to 16-byte aligned 128-bit data then?
>
> All the memory copying done by ExpandUnalignedStore/ExpandUnalignedLoad is just too expensive.
>
>
> On Sat, Jul 20, 2013 at 12:52 PM, Arnold Schwaighofer <aschwaighofer at apple.com> wrote:
>
> On Jul 19, 2013, at 3:14 PM, Francois Pichet <pichet2000 at gmail.com> wrote:
>
> >
> > What is the proper so...
2013 Jul 20
0
[LLVMdev] Disable vectorization for unaligned data
On Jul 19, 2013, at 3:14 PM, Francois Pichet <pichet2000 at gmail.com> wrote:
>
> What is the proper solution to disable auto-vectorization for unaligned data?
>
> I have an out of tree target and I added this:
>
> bool OpusTargetLowering::allowsUnalignedMemoryAccesses(EVT VT, bool *Fast) const {
> if (VT.isVector())
> return false;
> ....
> }
>