Displaying 3 results from an estimated 3 matches for "splitfactor".
2008 Dec 17
1
Noobie question, regression across levels
NB: Not reply needed (Ben was extremely helpful!)
I've just started using R last week and am still scratching my head.
I have a data set and want to run a separate regression across each level of
a factor (treating each one separately). The data right now is arranged such
that the value of the factor along which I want to "split" my data is one
column among many.
Best way to do
2016 Apr 11
2
X86 TRUNCATE cost for AVX & AVX2 mode
Hi,
I was going through the X86TTIImpl::getCastInstrCost, and got a doubt on cost
calculation for TRUNCATE instruction in AVX mode.
In AVX2ConversionTbl & AVXConversionTbl table there is no cost defined for
TRUNCATE v16i32 to v16i8, as a fallback it goes to SSE41ConversionTbl table and there
it finds cost as 30 for this operation. 30 cost for this operation looks very high.
Wondering why
2016 Apr 12
2
X86 TRUNCATE cost for AVX & AVX2 mode
...Subject: RE: X86 TRUNCATE cost for AVX & AVX2 mode
Hi,
One day I worked hard and refactored the cost calculation for all X86 targets.
http://reviews.llvm.org/D15604
But this revision was not accepted.
I fixed conversions, but assume that truncation suffers from the same problem.
I used "SplitFactor" in order to process wide types.
I'll be happy if you'll try to reanimate this work or part of it, because the huge numbers causes a non-optimal vectorization factor to be chosen.
- Elena
From: Nema, Ashutosh [mailto:Ashutosh.Nema at amd.com]
Sent: Monday, April 11, 2016 1...