2L decoder, d=5, 5h+1h
Since then, the WebAssembly CG has dramatically expanded the core capabilities of the language, adding shared memories, SIMD, exception handling, tail calls, 64-bit memories, and GC support, alongside many smaller improvements such as bulk memory instructions, multiple returns, and reference values.
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// Signal how many bytes we wrote
TST_SEL_RET (0x02) -- used by far RET to detect cross-privilege returns: