Javascript:SpiderMonkey:OdinMonkey

Active

Continue iteration on SIMD proposal and implementation/optimization in Ion/Odin.
SharedArrayBuffer
- Share source text between workers: bug 1211723
- Share asm.js machine code between workers: (TODO)
Baseline compilation: bug 1157624, bug 1169167

Parse and AOT compile while downloading: bug 1061886
Remove async-script requirement for asm.js caching:
- Maybe remove it from QuotaManager: bug 961057
- More likely, just take (large) script parsing off the main thread: bug 1084009
Share compiled code between workers: bug 1168981

Meta bug: bug 1200406
Optimize sin/cos: bug 967709
Use callee-saved registers: bug 985065
Heap access: bug 1145676, bug 897425, bug 870743, bug 983131, bug 1056027, bug 1136276
Optimize add-with-overflow: bug 1043365
Optimize min/max: bug 1060635
For asm.js->asm.js calls on x86, pass the return value via xmm register, not fp stack
Remove branching from double-to-int conversion using signal handler (see also bug 818750)
Optimize calls into (bug 962641), out of (bug 1000632), and between (bug 982036) asm.js modules.
Signed comparisons: bug 1141407

Zero-cost exception handling: bug 1065089
Extend asm.js to allow proper tail calls for all return types and do the tail-call optimization
Effectively support 'goto' (even computed 'goto') by formalizing a pattern of while+switch that gets compiled as if it was goto
Extend asm.js to better support dynamically linking asm.js modules (a mutable, callable array argument to asm.js module, like the PLT)
Add DataView to avoid the alignment mask on asm.js heap accesses (this is mostly a problem of DataView being slow in all browsers)

int64 arithmetic: https://gist.github.com/BrendanEich/4294d5c212a6d2254703
ArrayBuffer.prototype.discard (bug 855669): to allow madvise(DONTNEED)
Typed Objects: (Typed Objects)
- This feature comes with float32/uint64/int64 value types, which would be useful as scalar types in asm.js.
- Formalize Typed Object "class declarations" in asm.js which could make asm.js a target for JVM/CLR/TypeScript (and allow these languages to reuse the builtin JS GC)
FunctionPromise: bug 854627, or perhaps just make some functions (asm.js, no-free-variables) structured-cloneable
Add way to programmatically observe whether asm.js validated: bug 952847

Add about:config option to throw for out-of-bounds or unaligned access (bug 1088655)
Fix asm.js caching browser interop (bug 527667, bug 1047105

Credit to John Howard