Nikita Popov b7c0452a9a
[PowerPC][AIX] Specify correct ABI alignment for double (#144673)
Add `f64:32:64` to the data layout for AIX, to indicate that doubles
have a 32-bit ABI alignment and 64-bit preferred alignment.

Clang was already taking this into account, but it was not reflected in
LLVM's data layout.

A notable effect of this change is that `double` loads/stores with 4
byte alignment are no longer considered "unaligned" and avoid the
corresponding unaligned access legalization. I assume that this is
correct/desired for AIX. (The codegen previously already relied on this
in some places related to the call ABI simply by dint of assuming
certain stack locations were 8 byte aligned, even though they were only
actually 4 byte aligned.)

Fixes https://github.com/llvm/llvm-project/issues/133599.
2025-12-11 08:57:26 +01:00
..
2025-05-22 15:42:22 +01:00