[Bug target/126741] x86_64-w64-mingw32: 512-bit by-value arguments and return values are stored to caller stack temporaries with aligned vmovapd, but the temporaries are only 16-byte aligned — runtime crash (0xC0000005)

[gdwolfman at icloud dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126741

--- Comment #2 from Gary Wolfman <gdwolfman at icloud dot com> ---
Created attachment 65294
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65294&action=edit
Minimal reproducer for AVX2 ymm

Upon further testing, this bug extends down to 256 bit/AVX2 paths, exposing it
to a far wider audience.