llvm dev - Jul 2009 - [LLVMdev] Where does llvm.memcpy.i64 and friends get lowered ?

Hi,

I am working on the COFF backend and am wondering where llvm.memcpy gets
lowered to memcpy ?

It seems to be done by the assembler backends and would have thought
it would either be done by a lowering pass or done by the mangler but it
does not seem to be either.

Many thanks in advance,

Aaron
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On Jul 18, 2009, at 2:21 PM, Aaron Gray wrote:
> Hi,
>
> I am working on the COFF backend and am wondering where llvm.memcpy  
> gets lowered to memcpy ?
The instruction selector does this, it turns it into "ExternalGlobal"
operands.
>
> It seems to be done by the assembler backends
What code are you referring to?

-Chris

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

I am iterating through Modules symbols for 'test/CodeGen/X86/memcpy.bc

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
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