This change switches to using -msimd128 compile flags instead of
-munimplmemented-simd128.
The reason for the switch is that in general, compiling with
-munimplemented-simd128 is asking for trouble, as it may generate
instructions that Chrome doesn't understand yet.
We've been carefully avoiding the issues so far, but at this point
-msimd128 supports all but one (swizzle) instruction that we need.
This change explicitly marks the function chain in vertex codec as using
unimplemented-simd128 (you need to mark the chain to enable inlining),
which generates more or less the same code.
The benefit is that codecbench-simd.js can now be ran in Chrome/v8!
Also switch to emscripten_get_now to get more precise timer than
clock().
make codecbench.wasm now builds a standalone .wasm executable. This
change also disables memory growth to make sure that we have the minimum
number of imports.
This code can be used to benchmark native vs .js implementations of
vertex codec (and, in the future, vertex filters).
Note: right now the SIMD variant of the JS benchmark doesn't run because
compiler generates some instructions that Chrome doesn't support...
Arseny Kapoulkine