[PATCH] D24593: Standford/Bubble sort code restructure

[Evgeny Stupachenko via llvm-commits]

evstupac added a comment.

> This is not flaky.

Maybe it is not flaky. But what I'm trying to say that now the test is not ok to measure compiler performance.
Exactly the same (same instructions, same addresses) hot loop, but performance is 2 times lower. How compiler can deal with this?
Branches here are unpredictable, the data is random. In prolog case we are lucky to have more predictable branches. In epilog case no.

We can leave the test code as is, but modify array data filing. This will also help. But leaving the test as is will cause unreasonable performance changes in future.


https://reviews.llvm.org/D24593