efriedma added a comment.
I'm afraid the AutoUpgrade component of this isn't compatible with existing IR
without some additional work. I'm most concerned about cases like the
following:
#pragma pack(8)
struct X { __int128 x; }; // Not a packed struct in IR because the native
alignment is 8
struct Y { long long x; struct X y; }; // 24 bytes before autoupgrade, 32
bytes after
struct Y x;
------
On a related note, we need to add "Fn8" to the x86 datalayout at some point.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D86310/new/
https://reviews.llvm.org/D86310
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