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Because LLVM IR is CPU-Arch specific. For instance, IR for x86 cannot be used on ARM CPUs, which is also the reason why Apple's bitcode representation intended

Because LLVM IR is CPU-Arch specific. For instance, IR for x86 cannot be used on ARM CPUs, which is also the reason why Apple's bitcode representation intended to make apps portable, doesn't cross the iOS (ARM) <--> MacOs (x64) boundary, unless ARM ISA emulation is happening in Mac (like in Marzipan?)

saagarjha 7y ago
Marzipan is not an ARM emulation layer.
vnorilo 7y ago
It is not so much that the IR is specific, apart from platform intrinsics. It is that almost any optimization pass will encode architectural details, like packing and alignment.