[master] RFR: Load Klass from header, C1 [v11]

[Aleksey Shipilev]

On Mon, 18 Oct 2021 10:23:27 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> src/hotspot/cpu/x86/c1_CodeStubs_x86.cpp line 311:
>> 
>>> 309:     // without messing with the stack.
>>> 310:     __ xchgptr(rax, res);
>>> 311:   }
>> 
>> I am trying to wrap my head around this in early Monday :) Is `res` guaranteed to be callee-save? I.e. does this stashing work if runtime call clobbers `res`?
>
> The actual save/restore of registers and the runtime call happens in the stub in c1_Runtime1_x86.cpp

OK, taking that one on faith :)

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PR: https://git.openjdk.java.net/lilliput/pull/20