[LLVMdev] disable llc optimizations

[Jim Grosbach]

On Dec 6, 2010, at 10:57 AM, John Criswell wrote:

> On 12/6/10 11:39 AM, Andrew Lukefahr wrote:
>> Hi,
>> 
>> How would I disable dead code elimination in llc?  Can that be done via the command line or do I need to modify llc's source?  
> 
> You can use llc --help-hidden to see a list of options.  There are several -disable-xxx options that disable various code generator optimizations.
> 
> That said, I, like Duncan, wasn't aware that llc did any dead-code elimination (beyond peephole optimization).  Are you sure llc is removing the instructions you care about?
> 


Perhaps the dead machine instruction elimination pass? (DeadMachineInstructionElim.cpp) I don't think there's a way to disable that.

-Jim