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Make 128-bit integers 16-byte-aligned on x86-64 for LLVM <18 #14310

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Make 128-bit integers 16-byte-aligned on x86-64 for LLVM <18 #14310

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HertzDevil
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@HertzDevil HertzDevil commented Feb 19, 2024 •
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Closes #13609

@ysbaddaden
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I ran into SIGILL errors when I tried double-word compare-and-set (cmpxchg16b) with a 128-bit integer recently (use --mattr=+cx16 to enable support in LLVM).

Could it be related?

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128-bit integers are underaligned on x86-64
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