Re: BUG: GCC-4.4.x changes the function frame on some functions

[H. Peter Anvin]

Hence a new unconstrained option...

"Jeff Law" <law@xxxxxxxxxx> wrote:

>On 11/19/09 12:50, H. Peter Anvin wrote:
>>
>> Calling the profiler immediately at the entry point is clearly the more
>> sane option.  It means the ABI is well-defined, stable, and independent
>> of what the actual function contents are.  It means that ABI isn't the
>> normal C ABI (the __fentry__ function would have to preserve all
>> registers), but that's fine...
>>    
>Note there are targets (even some old x86 variants) that required the 
>profiling calls to occur after the prologue.  Unfortunately, nobody 
>documented *why* that  was the case.   Sigh.
>
>Jeff

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