[llvm-commits] [llvm] r76733 - in /llvm/trunk: lib/Target/ELFTargetAsmInfo.cpp test/CodeGen/Mips/2008-07-22-Cstpool.ll

[Eric Christopher]

On Jul 22, 2009, at 4:28 PM, Chris Lattner wrote:

>
> On Jul 22, 2009, at 10:35 AM, Eric Christopher wrote:
>
>>
>> On Jul 22, 2009, at 9:38 AM, Chris Lattner wrote:
>>
>>> Does anyone know what the deal is with this flag?  Is it supported  
>>> on
>>> some targets, but not others?  Is it supported for some kinds of
>>> globals but not others?  BFD has this comment:
>>>
>>> {* This section contains "short" data, and should be placed
>>>    "near" the GP.  *}
>>> #define SEC_SMALL_DATA 0x400000
>>>
>>> Which isn't super helpful.  It's unclear to me exactly what this is
>>> useful for, since the assembler is being told the size of the
>>> elements
>>> in the section.
>>
>> It's really fairly target dependent. Mips, for example, uses it on  
>> the
>> embedded side for various different types of symbols. Not-under mips-
>> linux though. From a quick look it appears that some of the ppc bits
>> use small data, I'm uncertain about OS support etc though. i386
>> doesn't use it at all :)
>
> Ok, Kevin informs me that the small flag was a "disaster" at mips, so
> I've zapped it. :)

Yeah, only the insane use it in practice :)

-eric