llvm dev - Aug 2010 - [LLVMdev] Purpose of PROLOG_LABEL in function prologue?

I don't see any references to them, that's why I brought it up...

On Aug 3, 2010, at 3:12 PM, Eric Christopher wrote:
> 
> On Aug 3, 2010, at 3:04 PM, Cameron Esfahani wrote:
> 
>> I've been building/dumping some x86_64 code and I've noticed
that each of the routines has 3 temporary symbols, à la:
>> 
>> _main:
>> 	pushq	%rbp
>> Ltmp18:
>> 	movq	%rsp, %rbp
>> Ltmp19:
>> 	subq	$320, %rsp
>> Ltmp20:
>> 	movl	%ecx, -276(%rbp)
>> 
>> I've tracked them back to emitPrologue in X86RegisterInfo.cpp. 
I'm wonder what's their purpose?
>> 
>> They're filling up my symbol table...
> 
> 
> EH ranges for unwind info.  If you look later on in the file for the
symbols you'll see them.
> 
> -eric
Cameron Esfahani
dirty at apple.com

"You only live once, and the way I live, once is enough"

Frank Sinatra

On Aug 3, 2010, at 3:19 PM, Cameron Esfahani wrote:
> I don't see any references to them, that's why I brought it up...
Interesting.  Is this COFF? We may not emit the final debug info, but leave the
ranges in.  If they're filling up your symbol table then we likely need
another type of assembler label for "COFF internal".

-eric

Yeah, this is for COFF.

On Aug 3, 2010, at 3:21 PM, Eric Christopher wrote:
> 
> On Aug 3, 2010, at 3:19 PM, Cameron Esfahani wrote:
> 
>> I don't see any references to them, that's why I brought it
up...
> 
> Interesting.  Is this COFF? We may not emit the final debug info, but leave
the ranges in.  If they're filling up your symbol table then we likely need
another type of assembler label for "COFF internal".
> 
> -eric
Cameron Esfahani
dirty at apple.com

"The cake is a lie."

Common wisdom

Is there any reason why we couldn't skip emitting temporary labels in the
COFF writer?

I tried that and everything looks okay...

On Aug 3, 2010, at 3:21 PM, Eric Christopher wrote:
> 
> On Aug 3, 2010, at 3:19 PM, Cameron Esfahani wrote:
> 
>> I don't see any references to them, that's why I brought it
up...
> 
> Interesting.  Is this COFF? We may not emit the final debug info, but leave
the ranges in.  If they're filling up your symbol table then we likely need
another type of assembler label for "COFF internal".
> 
> -eric
Cameron Esfahani
dirty at apple.com

Linus is dumb.