On Sat, May 11, 2019 at 12:23:31AM +0000, Mike Franklin via Digitalmars-d-announce wrote: [...] > Also, take a look at this data: > https://forum.dlang.org/post/jdfiqpronazgglrkm...@forum.dlang.org Why > is DMD making 48,000 runtime calls to memcpy to copy 8 bytes of data? > Many of those calls should be inlined. I see opportunity for > improvement there. [...]
When it comes to performance, I've essentially given up looking at DMD output. DMD's inliner gives up far too easily, leading to a lot of calls that aren't inlined when they really should be, and DMD's optimizer does not have loop unrolling, which excludes a LOT of subsequent optimizations that could have been applied. I wouldn't base any performance decisions on DMD output. If LDC or GDC produces non-optimal code, then we have cause to do something. Otherwise, IMO we're just uglifying D code and making it unmaintainable for no good reason. T -- Recently, our IT department hired a bug-fix engineer. He used to work for Volkswagen.
