[LLVMdev] Where does llvm.memcpy.i64 and friends get lowered ?

Aaron Gray
Sat, 18 Jul 2009 23:45:49 -0000

2009/7/19 Chris Lattner <clattner at apple.com>

>   On Jul 18, 2009, at 3:28 PM, Aaron Gray wrote:
>
> 2009/7/18 Chris Lattner <clattner at apple.com>
>
>>   On Jul 18, 2009, at 2:56 PM, Aaron Gray wrote:
>>
>>  I am iterating through Modules symbols for
'test/CodeGen/X86/memcpy.bc
>>
>>
>> If you're iterating over functions, just ignore all intrinsics.
>>
>
> Okay, but it would be nice if the Module object reflected the lowered
> symbol names like 'memcpy' too. It seems a bit of an inconsistancy
for the
> Module not to reference this and have to pick it up from the relocations.
>
>
> If you're iterating over the Module, you're not dealing with the
codegen
> level.  We want the code generator to change as little as possible when
> doing codegen.
>

No I'm doing the COFFWriter, its just that symbols are being introduced via
relocations, but AFAICT they are not defined in the Module. This seems to be
happening with memcpy and friends.


>
>  Also there is the matter of 'abort' which seems to be defined by
most if
> not all modules even if it is not being used. I am
> using GlobalValue::getUses() to filter it. Whats going on with
'abort' ?
>
>
> I have no idea what you're talking about.
>

There is a function symbol called 'abort' that is being defined, whether
it
is used or not. Its not defined in the '.ll' file and useage count is
zero, yet it is always nearly defined. I think there were a few test cases
where it was not present, I will have to double check this.

Aaron


>
> -Chris
>
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