Sign extension

[Hawk777]

The sign extension instructions (i32.extend8_s, i32.extend16_s, i64.extend8_s, i64.extend16_s, and i64.extend32_s) seem like they would map quite nicely onto efficient JVM code.

[Buzzec]

These are part of the sign-extension operators extension (opcode ref). This is now considered default by LLVM.

[cretz]

👍 I don't work on this project much anymore but if/when I get around to it, that and many other extensions would be added (e.g. GC)

[Hawk777]

Not promising I’d have time or anything, but if I did, would you accept PRs?

[cretz]

Yes, but I can't promise I'd review quickly. Also, you'd have to update the test harness surely, and unsure if you'd uncover any other bugs.