https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70499
--- Comment #4 from Matthias Hochsteger <matthias.hochsteger at tuwien dot ac.at> --- This testcase is just a very striped-down version of the actual code to reproduce the error, so it may seem useless at some spots, like the missing initialization. We already have a workaround by adding additional __attribute__((__always_inline__)) to the methods of SIMD, in this sense it's no critical bug. This code is part of a cross-platform project. We are including immintrin.h since it is supplied by all used compilers. I am not sure how typedef double v4df __attribute__((vector_size (32))); behaves on others, but we will give it a try. Thanks, Matthias