MaskRay added a comment.
Ah, OK. I am investigating a miscompile that `: "=a"(__eax), "=r" (__ebx),
"=c"(__ecx), "=d"(__edx) \` may assign `"=r"` to use RDX. The output then looks
like
xchgq %rbx, %rdx
cpuid
xchgq %rbx, %rdx
and rbx is clobbered, since cpuid writes rax/rbx/rcx/rdx.
Rep
craig.topper added a comment.
I think it's still relevant. We had the same issue on Windows as recently as
https://github.com/llvm/llvm-project/issues/49477 see also
https://github.com/llvm/llvm-project/issues/17204
Repository:
rG LLVM Github Monorepo
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Use the x86-32 implementation for x86-64, i.e. replace =r plus xchgq wi
