[PATCH] Add two new calling conventions for runtime calls

[Juergen Ributzka]

Hi Lang,

yes they are meant to be generic - although this patch only implements the X86 side (for now).
I will extend LangRef with a more detailed description of the new calling conventions.

Thanks for looking at it.

Cheers,
Juergen


On Jan 15, 2014, at 10:41 AM, Lang Hames <lhames at gmail.com> wrote:

> Hi Juergen,
> 
> If these calling conventions are intended to be generic, should a
> description be added to the LangRef?
> 
> Otherwise LGTM.
> 
> - Lang.
> 
> On Tue, Jan 14, 2014 at 3:11 PM, Juergen Ributzka <juergen at apple.com> wrote:
>> ping
>> 
>> On Jan 10, 2014, at 7:45 PM, Juergen Ributzka <juergen at apple.com> wrote:
>> 
>>> New rebased patch and a small fix to the label check in the unit test.
>>> 
>>> Cheers,
>>> Juergen
>>> 
>>> <0002-Add-two-new-calling-conventions-for-runtime-calls.patch>
>>> 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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>> 
>> 
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