Re: [v8-dev] V8_PRESERVE_MOST increases code size on Windows

['seth.b...@microsoft.com' via v8-dev]

I guess you know it already, but just in case: changing *preserve_most* for 
Windows would likely require adding a new windows-specific *callee-saved-regs 
list* into *X86CallingCond.td *(e.g. *CSR_Win64_RT_MostRegs*) that would 
contain *xmm6-xmm15*. Then you'd need to dispatch based on whether *IsWin64*
 in *X86RegisterInfo.cpp.*


I didn't know that, so you saved me a lot of time. Thanks! 🙂 The change is 
now landed in LLVM: Update preserve_most to treat XMM registers like C by 
sethbrenith · Pull Request #73866 · llvm/llvm-project (github.com) 
<https://github.com/llvm/llvm-project/pull/73866>.
 

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