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A comment on Apple and Intel first to use TSMC 3nm. Parent comment

Re:Apple and Intel first to use TSMC 3nm by jmgao on Saturday July 03, 2021 @05:57PM (#27725261)
> You can use the `-march` flag for your compiler to target specific architectures, for instance -march=tigerlake or -march=znver3

Note that -march will use instructions that might be unavailable on other CPUs of the target. -mtune (which is implied by -march) is the flag that sets the cost tables used by instruction selection, cache line sizes, etc.

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Re:Apple and Intel first to use TSMC 3nm by jiggawatts on Sunday July 04, 2021 @07:16AM (#27728834)
I recently watched the CppCon 2019 talk by Matt Godbolt "Compiler Explorer: Behind The Scenes"[1], and a cool feature he presented is the integrated LLVM Machine Code Analyser tool. If you look at the "timeline" and "resource" views of how a Zen 3 executes a typical assembly snippet, it is absolutely mind blowing. That beast of a CPU has so many resources it's just crazy.

[1] https://www.youtube.com/watch?v=kIoZDUd5DKw

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