[llvm] [BOLT][AArch64] Introduce SPE mode in BasicAggregation (PR #120741)

[Amir Ayupov via llvm-commits]

aaupov wrote:

Hi Paschalis, thank you for working on this.
The benefit that SPE has over IP sampling is the edge frequency information. So instead of creating two basic (IP) samples we should create branch samples (LBR) with stack depth one. Branch samples are later attached to CFG edges. This should improve the resulting performance when using SPE profiling.

https://github.com/llvm/llvm-project/pull/120741