Postpone expanding va_arg until pass_stdarg

[Richard Biener]

On February 13, 2015 10:40:17 PM CET, Tom de Vries <Tom_deVries@mentor.com> wrote:
>On 13-02-15 09:57, Richard Biener wrote:
>>> [ We're still expanding ifn_va_arg before the va_list_gpr/fpr_size
>>> >optimization. ]
>> Yeah, and the point of the exercise was of course to change that;)
>
>Well, there are two parts.
>
>The first is postpone expansion of va_arg to before the
>va_list_gpr/fpr_size 
>optimization. This eliminates disturbance between the expansion and the
>
>optimization, and  makes pass_stdarg more robust. This allows us to
>insert 
>optimizations before pass_stdarg without breaking pass_starg.
>
>The second is to simplify pass_starg by handling va_arg rather than the
>
>expansion of va_arg.
>
>I think the first part by itself (which is done now) is already
>worthwhile on 
>its own.

I agree.  It also enables easier inlining of vaarg functions.

Richard.

>Thanks,
>- Tom