Displaying 2 results from an estimated 2 matches for "aligned_ptr".
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aligned_pbn
2013 Jul 21
0
[LLVMdev] Disable vectorization for unaligned data
...e aligned data we need to know that data is 16-byte aligned. The way we vectorize we won’t know that until after we have vectorized. As you have observed we will pass “4” to getMemoryOpCost in the loop vectorizer (as that is the only thing that can be inferred from a consecutive scalar access like “aligned_ptr += 32bit”).
scalar code -> estimate cost based on scalar instructions -> vectorize -> vectorized code -> ... -> instcombine (calls ComputeMaskedBits) which computes better alignment for pointer accesses like “aligned_ptr += 128bit”.
I will have to work on this soon as ARM also has...
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:
>
> >
> >