[U-Boot] [PATCH 62/71] serial: spl: Implement empty functions for SPL

[Tom Rini]

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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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