[PATCH] Add two new calling conventions for runtime calls

[Juergen Ributzka]

New rebased patch and a small fix to the label check in the unit test.

Cheers,
Juergen

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On Jan 10, 2014, at 3:47 PM, Juergen Ributzka <juergen at apple.com> wrote:

> Hi @ll,
> 
> this patch adds two new target-independent calling conventions for runtime calls - Runtime and FastRuntime.
> 
> The target-specific implementation for X86-64 is defined as following:
> 	- Arguments are passed as for the default C calling convention
> 	- The same applies for the return value(s)
> 	- for runtimecc the callee preserves all GPRs - except R11
> 	- for fastruntimecc the callee preserves all GPRs and all XMMs - except R11
> 
> The idea is to provide calling conventions for calls to very hot runtime functions that are normally just a few lines of assembly code and don’t require a lot of registers. This could be used by the ObjectiveC runtime, or any other runtime that provides performance critical functions.
> 
> The FastRuntime CC is intended to be used for small codes that don’t call any other functions at all.
> The Runtime CC is also intended for small codes that usually don’t call other functions on the fast path, but might have to on the slow path.
> 
> Cheers,
> Juergen
> 
> <0001-Add-two-new-calling-conventions-for-runtime-calls.patch>
> 
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