Displaying 3 results from an estimated 3 matches for "widestregist".
Did you mean:
widestregister
2018 Jul 24
2
KNL Vectorization with larger vector width
Hello,
I need help here. I am able to adjust the vector width through
WidestRegister value. When number of iterations=31 and I set vector
width=32 it gives <16xi32> and <8xi32> instructions.
However if i replicate same behavior with number of iterations=63 and I
set vector width=64, no vector instructions are emitted. it should do as
previous and gives <32xi32&g...
2018 Jul 23
2
KNL Vectorization with larger vector width
...files have the code for this?
>
>
> I believe that the thing that you're trying to affect is this:
>
> LoopVectorizationCostModel::computeFeasibleMaxVF(bool OptForSize,
> unsigned ConstTripCount)
> {
> ...
> unsigned WidestRegister = TTI.getRegisterBitWidth(true);
>
>
> and so your target's TargetTransformInfo class should return an
> appropriate value from getRegisterBitWidth.
>
> -Hal
>
>
>
> Please help
>
> Thank You
> Regards
>
>
>
>
> __________________________...
2018 Jul 24
2
KNL Vectorization with larger vector width
Thank You.
Right now to see the effect i did following changes;
unsigned X86TTIImpl::getRegisterBitWidth(bool Vector) {
if (Vector) {
if (ST->hasAVX512())
return 65536;
here i changed 512 to 65536. Then in loopvectorize.cpp i did following;
assert(MaxVectorSize <= 2048 && "Did not expect to pack so many elements"
" into