CFI directives in assembly files
Imperial Violet
JANUARY 18, 2017
(This post uses x86-64 for illustration throughout. The fundamentals are similar for other platforms but will need some translation that I don't cover here.). Despite compilers getting better over time, it's still the case that hand-written assembly can be worthwhile for certain hot-spots. Sometimes there are special CPU instructions for the thing that you're trying to do, sometimes you need detailed control of the resulting code and, to some extent, it remains possible for some people to out-op
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