Displaying 3 results from an estimated 3 matches for "interleave_count".
2015 Dec 22
2
Question about __builtin_assume()
void test_copy_vec(const short* restrict src, short* restrict res, int N) {
__builtin_assume( (N > 1) && (N%2 == 0) );
#pragma clang loop vectorize(enable) vectorize_width(2) interleave_count(1)
for (int j=0; j<N; ++j)
*res++ = *src++;
}
If I use __builtin_assume(N>1) then llvm knows the loop will execute and not check for (j <= 0), but I can't seem to get it to accept N is even. Is there a way to get llvm to vectorize the loop and not generate the additional scalar...
2019 Sep 10
3
loop vectorizer disabling
I would like to propose that loop pragma `vectorize(disable)` actually means disabling the vectorizer for that loop. This perhaps sounds really obvious (I hope it does), but currently `vectorize(disable)` sets the vectorization width to 1, and that means the vectorizer will run and could perform other tricks such as interleaving. The main reason to change the behaviour is that it will be more what
2016 Jun 15
8
[RFC] Allow loop vectorizer to choose vector widths that generate illegal types
Hello,
Currently the loop vectorizer will, by default, not consider vectorization
factors that would make it generate types that do not fit into the target
platform's vector registers. That is, if the widest scalar type in the
scalar loop is i64, and the platform's largest vector register is 256-bit
wide, we will not consider a VF above 4.
We have a command line option (-mllvm