eugenis added a comment.
You are absolutely right. X86 variant uses an "=a" constraint (rax register),
others pin the output variable to a specific register with __asm__ declaration.
It appears we've missed it in Aarch64.
Could you check if __asm__("x0") in the declaration of res helps?
Repository:
rG LLVM Github Monorepo
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https://reviews.llvm.org/D105169/new/
https://reviews.llvm.org/D105169
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