On Tue, Jul 21, 2020 at 11:46 AM Mark Shannon <[email protected]> wrote:
> On 18/07/2020 9:20 am, Inada Naoki wrote: > > And I am worrying precise tracing blocks future advanced bytecode > optimization. > > Can we omit precise tracing and line number information when > > optimization (`-O`) is enabled? > > I don't think that is a good idea. > Performing any worthwhile performance optimization requires that we can > reason about the behavior of programs. > Consistent behavior makes that much easier. > Inconsistent "micro optimizations" make real optimizations harder. > Echoing what Mark said, there should be no perceived tension between debugging and optimization. For over 20 years the JVM has been the existence proof: Java is always precisely debuggable when the compiler is generating code at the highest optimization levels. IMHO, a Python user shouldn't have to expect anything less.
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