I was benchmarking some essential routines by executing cycles such as:

```
float *src, *dst;
for (int i=0; i<cnt; i++) dst[i] = round(src[i]);

```

All with AVX2 target, newest CLANG. Interestingly floor(x), ceil(x), int(x)... all seem fast. But round(x) seems exremely slow and looking into disassembly there's some weird spaghetti code instead of the newer SSE or AVX versions. Even when blocking the ability to vectorize the loops by introducing some dependency, round is like 10x slower. For floor etc. the generated code uses vroundss, for round there's the spaghetti code... Any ideas?

Edit: I'm using -ffast-math, -mfpmath=sse, -fno-math-errno, -O3, -std=c++17, -march=core-avx2 -mavx2 -mfma