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Is the code actually compiled with -fno-strict-aliasing (which IME is rare for userspace code, but I don't work with numerical code very much), or are you sayin

Is the code actually compiled with -fno-strict-aliasing (which IME is rare for userspace code, but I don't work with numerical code very much), or are you saying this is because of the types involved in the cast? I didn't see anything in [0] about a change in pointer semantics from using the vector extensions in the compilation unit? [0]: https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector-Extensions https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Ve...

zokier 4y ago
_m512i is defined as may_alias https://github.com/gcc-mirror/gcc/blob/master/gcc/config/i386/avx512cdintrin.h#L43 https://github.com/gcc-mirror/gcc/blob/master/gcc/config/i38... https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#Common-Type-Attributes https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.ht...