[LLVMdev] large llc footprint

reed kotler rkotler at mips.com
Thu Nov 3 16:35:40 PDT 2011

Ok. Thanks.

I will put some instrumentation into LLVM to help with memory usage 
tracking and take a look at llvm-extract.


On 11/03/2011 04:25 PM, Eli Friedman wrote:
> On Thu, Nov 3, 2011 at 3:02 PM, reed kotler<rkotler at mips.com>  wrote:
>> We have a large bitcode file produced from a tool. It's about 23 meg.
>> When we compile this with llc, the footprint is 4-7 gig depending on
>> which target.
>> On a desktop this is not such a problem but it is on mobile devices.
>> The suspect is that the flow graph for the entire program is built and
>> kept for the duration, even if no optimization needing it all is in
>> progress.
>> This would make us think that if we wrote a tool to split the bitcode up
>> into separate files that we could work around this.
> We already have the infrastructure for such a tool, if necessary; take
> a look at llvm-extract.
>> Maybe there are other possible solutions.
>> Any thoughts or experience from others on this problem would be greatly
>> appreciated.
> If you could figure out where the memory is going, that would be
> useful information; it sounds like llc is using more space than it
> should need.
> -Eli

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