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On 09/18/12 12:19, Marek Vasut wrote:
> Dear Tom Rini,
>
>> On 09/18/12 11:33, Marek Vasut wrote:
>>> Dear Scott Wood,
>>
>> [snip]
>>
>>>> I think I got some wires crossed and was thinking about
>>>> printf/puts. We want those to be optimized away at compile
>>>> time (not pointed to a stub at link time) on an SPL that has
>>>> no output support, but once that's done the low level serial
>>>> functions shouldn't be referenced anymore, right?
>>>
>>> But if you point them to stubs, that's OK. The compiler will GC
>>> these useless stubs anyway. But wait, we're getting to LTO
>>> here, right?
>>>
>>> So the safest bet really is macro in serial.h ?
>>
>> Due to the gcc bug I've mentioned before, yes. Dummy functions
>> will, I bet, keep the string constants around. do {} while(0)
>> will drop them out entirely.
>
> Damn, not much gain on m28evk (with C functionss/with macros),
> using gcc 4.7.1:
>
> Configuring for m28evk board... text data bss dec hex
> filename 418994 7780 288632 715406 aea8e ./u-boot 11773 788
> 12 12573 311d ./spl/u-boot-spl
>
> Configuring for m28evk board... text data bss dec hex
> filename 418998 7780 288628 715406 aea8e ./u-boot 11765 788
> 12 12565 3115 ./spl/u-boot-spl
Right, didn't have many strings. But do you see what I mean now about
not needing this patch as it stands currently?
- --
Tom
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