>
>
>
> Yes, it's true that noinline is lost after LLVM IR, so binaryen
> optimizations may inline things you didn't expect. Note that this was true
> with the asm.js backend before as well, as it also ran the binaryen
> optimizer, but whether something is inlined depends on lots of stuff so
> maybe it wasn't as noticeable.
>
> If you do the link step with -O0 then it won't run the Binaryen optimizer
> at all, and just do a simple link, which avoids this. But that won't help
> for a release build where you do want to optimize during link to get the
> best code size. Are you just surprised by the inlining, or is this causing
> a problem for you? If it's a problem, we can add support for disabling
> inlining in binaryen.
>
> Not really a problem, was just suprising.
>
>
>> - The final link still takes a lot of time even when all the inputs are
>> wasm object files. Most time seems to be spent in wasm-opt from binaryen.
>> Does wasm-opt do
>> link-time optimization only, or it still does basic optimizations which
>> are presumably already done by llvm before emitting the wasm object files ?
>>
>>
> Related to the above, if you link with -O0 then it won't optimize in
> Binaryen, and the link step will be just a simple fast link (it also won't
> do various JS optimizations, so again it's good for an incremental build
> but not for release).
>
> In my tests, wasm-opt does seem to save around 10% from the executable
size, even if the inputs are wasm object files created by emcc -Oz. Do the
savings come from whole program optimization, or wasm-opt is doing some
per-function optimizations that the llvm backend currently cannot do ?
Zoltan
> - Alon
>
>
>
>> thanks
>>
>> Zoltan
>>
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