On Sunday, 14 January 2018 at 23:18:42 UTC, Jon Degenhardt wrote:
Combined, LTO and PGO resulted in performance improvements greater than 25% on three of my standard six benchmarks, and five of the six improved at least 8%.

Yay, I'm usually seeing double digit improvements for PGO alone, and single digit improvements for LTO. Meaning PGO has more effect even though LTO seems to be the more hyped one.
Have you bothered benchmarking them separately?

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