jasonmolenda wrote:

FTR I wouldn't be shocked if Windows codegen is omit-frame-pointer by default.  
On 32-bit i386 it was a real performance boost to get one more general purpose 
register (rbp).  On 64-bit x86_64, it's a much smaller performance boost but 
they were probably in the habit of that  codegen style already, and stuck with 
it.  On targets like AArch64 or RISC-V, the register file is quite large and 
there's no benefit to omit-frame-pointer.

https://github.com/llvm/llvm-project/pull/210076
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