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From: Hans Aberg <haberg-news@telia.com>
Newsgroups: comp.compilers
Subject: Re: Optimization techniques
Date: Wed, 17 Apr 2019 18:11:57 +0200
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On 2019-04-17 15:42, Rick C. Hodgin wrote:
> Are there resources someone can point me to for learning more about
> time-honored, long-established, safely applied, optimization
> techniques for a C/C++ like language?

You might pick down LLVM and check its passes.
   https://llvm.org/docs/WritingAnLLVMPass.html