Javascript:SpiderMonkey:OdinMonkey: Difference between revisions

Revision as of 20:30, 6 March 2014

Record enough information at compile time so that asm.js functions show up in:
- the builtin FF profiler: bug 947996
- Error.stack
Add inline fast implementation of sin/cos: bug 967709
32-bit OOM-on-reload mitigation: bug 865959
Add webapp manifest option to request AOT compilation at install (not first run) time: bug 965970
Standardize and implement SIMD extensions to JS (bug 894105) and then incorporate into asm.js
Land experimental SharedArrayBuffer (pref'd off, bug 933001) and use this to add experimental pthreads support to Emscripten and evaluate on threaded codebases in preparation for a standards proposal.

Further improve load-time:
- Start general JS parsing before the entire JS script has completed downloading so that asm.js compilation can overlap (and we'd be justified in doing all script parsing off the main thread)
- asm.js parser: Avoid building an intermediate parse tree; type check during recursive descent bug 854061
Further improve caching:
- Compress more than just the source in asm.js cache entries
Improve compile time on pathological functions:
- Break up super-large functions into disjoint regions that can be regalloc'd and optimized separately
- Investigate GVN quadratic behavior : bug 845068
Further improve heap access performance : bug 870743, bug 897425, bug 915157
For asm.js->asm.js calls on x86, pass the return value via xmm register, not fp stack
Extend the asm.js signal handler tricks to:
- Remove stack overflow checks
- Remove idiv branching
- Remove double-to-int conversion branching (see also bug 818750)

Heap resizing: bug 965880
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 enough try/catch to asm.js to allow compilation of C++ exceptions using the zero-cost implementation strategy
Add DataView to avoid the alignment mask on asm.js heap accesses (this is mostly a problem of DataView being slow in all browsers)

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
Add "AsmFunction" constructor that threw informative exception on validation failure.: (bug 952847)

Credit to John Howard

@@ Line 26: / Line 26: @@
 * Improve compile time on pathological functions:
 ** Break up super-large functions into disjoint regions that can be regalloc'd and optimized separately
+** Investigate GVN quadratic behavior : {{bug|845068}}
 * Further improve heap access performance : {{bug|870743}}, {{bug|897425}}, {{bug|915157}}
 * For asm.js->asm.js calls on x86, pass the return value via xmm register, not fp stack