https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80969
--- Comment #3 from Daniel Santos <daniel.santos at pobox dot com> --- Thank you for the report Martin. I apologize for my slow start on this, I've been a bit under the weather. So when I wrote the code for using aligned SSE saves with realigned (non-DRAP) stack pointer and the -mcall-ms2sysv-xlogues feature, I had failed to anticipate the need for a stack alignment greater than 16 bytes for the function body. This ICE is actually occurring from the realigned stack changes, but this problem also exists with the -mcall-ms2sysv-xlogues feature and both need to be fixed. For the sake of the ABI, we only need to save the XMM portion of each SIMD register (https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx) and we only need a 16-byte alignment to for those, but this function body needs its locals 64-byte aligned. On a side note, with the introduction of AVX-512, I wonder if there are some opportunities to make more efficient (compact) use of the stack with holes upwards of 56 bytes in the save area. I should probably learn AVX/2/512 better.
