[ruby-core:119635] [Ruby master Misc#20814] iseq optimizations on constant condition

Issue #20814 has been updated by hurricup (Alexandr Evstigneev).


nobu (Nobuyoshi Nakada) wrote in #note-1:
> To disable optimizations, see the document of `RubyVM::InstructionSequence.compile_option=`.
> https://docs.ruby-lang.org/en/master/RubyVM/InstructionSequence.html#method-c-compile_option-3D

My question is more about the runtime. E.g I want to run a ruby program with optimizations disabled at all. Or load using `rb_load`/`rb_load_protect` while ruby process is already alive with default settings.


----------------------------------------
Misc #20814: iseq optimizations on constant condition
https://bugs.ruby-lang.org/issues/20814#change-110288

* Author: hurricup (Alexandr Evstigneev)
* Status: Feedback
----------------------------------------
ruby 3.4-preview2 seems optimizes out some stuff when building iseq and this may lead to user unexpected behavior when debugging, because some lines just optimized out. 

Example:
```ruby
def foo1
  if true
    nil
  else
    1
  end
end
```

produces:
```
== disasm: #<ISeq:foo1@/test.rb:1 (1,0)-(7,3)>
0000 putnil                                                           (   3)[LiCa]
0001 leave                                                            (   7)[Re]
```

Two questions:
- is there way to disable such optimizations?
- are there some specs on things that can be optimized.



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