[PATCH] D11933: Extending debug ranges

[Vikram TV via llvm-commits]

tvvikram added a comment.

In http://reviews.llvm.org/D11933#226659, @friss wrote:

> > c. Add "STATISTIC" to count the number of DBG_VALUE instructions inserted/deleted. I am not sure what benchmarks to exactly test.
>
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> The kind of numbers that I (and Adrian I'm pretty sure) wanted to see are more compiler performance numbers. You add a new pass that will have a cost, and we care a lot about -O0 -g compile times. So what is the cost of your new code in terms of compile time?


I tried a few test cases where the MachineFunction remained unchanged and other test cases where instructions were inserted/deleted by this pass. I used clang -O0 -g followed by llc -O0 -time-passes and noticed that the new pass takes around 0.5% - 0.7% of Wall time.


http://reviews.llvm.org/D11933