[llvm-dev] Deleting function IR after codegen

[Vedant Kumar via llvm-dev]

Hi all,

>> Did you happen to measure whether it's even worth keeping for
>> --disable-free? I suppose the cost of deleting it might be enough to
>> worry about for very small compilations, in which case we'd probably
>> want to keep the current behavior.
> I didn’t, no.  We could though.
> 
> I’ve CCed Vedant as I know he looked at the cost of freeing the IR fairly recently.  I think he said it was about 3-4% compile time, but he can correct me if i have that wrong.

I measured how much time -disable-free saves for clang. It's 3% of the compile time of clang, opt, and a host of other llvm tools when built cleanly in release mode.

My thoughts on Pete's pass are the same as Hal's, + 1.

vedant