[PATCH] Add two new calling conventions for runtime calls

[Philip Reames]

On 1/16/14 10:39 AM, Philip Reames wrote:
> My only objection to this patch is the naming.  We also have runtime 
> calls with special calling conventions, but ours aren't the same as 
> the ones specified here. Could we rename these?
>
> A few random ideas for names:
> CPreserveGPR
> CPreserveGPRXMM
> WebKitRuntimeCC
Correction: ObjCRuntime.  It helps if I read the original email more 
closely.
>
> Also, should these be prefixed with X86_?
>
> Philip
>
> On 1/15/14 10:41 AM, Lang Hames 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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