[PATCH] D143425: Reland "[X86][ABI] Don't preserve return regs for preserve_all/preserve_most CCs""

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added a comment.

should there be a test with avx512 for `xmm16-31`?



================
Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:3388
+        CallConv != CallingConv::PreserveAll &&
+        CallConv != CallingConv::PreserveMost)
       MF.getRegInfo().disableCalleeSavedRegister(RetValReg);
----------------
`CallConv ==  CallingConv::X86_RegCall`


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  https://reviews.llvm.org/D143425/new/

https://reviews.llvm.org/D143425