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

[Aaron Gray]

2009/7/18 Aaron Gray <aaronngray.lists at googlemail.com>

> 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.
>
> 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' ?
>

In fact I cannot use getUses() as other "exported" symbols have zero uses.

My DiagWriter program is giving me :-

---------- Functions ----------
llvm.memcpy.i64
        Mangled name = llvm.memcpy.i64
        DefaultVisibility
        ExternalLinkage - Externally visible.
        Uses = 2
my_memcpy
        Mangled name = _my_memcpy
        DefaultVisibility
        ExternalLinkage - Externally visible.
        Uses = 0
my_memcpy2
        Mangled name = _my_memcpy2
        DefaultVisibility
        ExternalLinkage - Externally visible.
        Uses = 0
abort
        Mangled name = _abort
        DefaultVisibility
        ExternalLinkage - Externally visible.
        Uses = 0
----------- Globals -----------
----------- Aliases -----------

What is going on with 'abort', why is it nearly always there, but not
always (if I am correct) ?


>
> Aaron
>
>
>>
>> -Chris
>>
>>
>> I get :-
>>
>> ---------- Functions ----------
>> llvm.memcpy.i64
>>         Mangled name = llvm.memcpy.i64
>>         DefaultVisibility
>>         ExternalLinkage - Externally visible.
>> my_memcpy
>>         Mangled name = my_memcpy
>>         DefaultVisibility
>>         ExternalLinkage - Externally visible.
>> my_memcpy2
>>         Mangled name = my_memcpy2
>>         DefaultVisibility
>>         ExternalLinkage - Externally visible.
>> abort
>>         Mangled name = abort
>>         DefaultVisibility
>>         ExternalLinkage - Externally visible.
>> ----------- Globals -----------
>> ----------- Aliases -----------
>>
>> I am using this to define my symbols, but the relocations contain
>> 'memcpy'.
>>
>> Aaron
>>
>>
>>
>> 2009/7/18 Eli Friedman <eli.friedman at gmail.com>
>>
>>> On Sat, Jul 18, 2009 at 2:21 PM, Aaron
>>> Gray<aaronngray.lists at googlemail.com> wrote:
>>> > I am working on the COFF backend and am wondering where llvm.memcpy
>>> gets
>>> > lowered to memcpy ?
>>>
>>> It's done by ISel.  See SelectionDAG::getMemcpy.
>>>
>>> -Eli
>>>  _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>>>
>>
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>
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