Displaying 5 results from an estimated 5 matches for "opustargetlowering".
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 to the
top of the stack and work from there. This i...
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;
> ....
> }
>
> 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 to the top of the sta...
2013 Jul 19
0
[LLVMdev] Disable vectorization for unaligned data
...s? 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 that you want to optimize for size.
-Eli
> 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 to the
>...
2013 Jul 21
2
[LLVMdev] Disable vectorization for unaligned data
...ote:
>
> 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;
> > ....
> > }
> >
> > After that, I could see that vectorization is still done on unaligned
> data except that llvm will copy the data back and fort...
2013 Jul 21
0
[LLVMdev] Disable vectorization for unaligned data
...; wrote:
>
> 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;
> > ....
> > }
> >
> > 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...