On 03/01/2022 12:54, Martin Frb via fpc-devel wrote:
not sure if this is of interest to you, but I see you do a lot on the optimizer....
It's very likely unrelated to anything the optimiser does or does not do, and more regarding random differences in code layout. Charlie posted the following video on core just yesterday, and it touches on exactly this subject: https://www.youtube.com/watch?v=r-TLSBdHe1A
Choice quote: code layout and environment variables can produce up to 40% differences in performance, which is more than what even the best optimizing compilers can achieve do in most cases.
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