mraleph

"A survey of the literature on optimization uncovers many techniques that are hard to understand, harder to implement, more general than necessary and of marginal value. Our approach was to do the most profitable machine independent optimizations in the most profitable way"

Michael L. Powel - A Portable Optimizing Compiler for Modula-2

mraleph

#include <stdint.h>

/* clang version 3.5.0 (trunk 214024) */

void f(uint32_t* p) {
  while (__builtin_uadd_overflow(*p, 1, p)) {
    p++;
  }
}

mraleph

function B1() {
  var start = Date.now();
  while (...) { /* do N iterations of test body */
    /* body of the case goes here {{{ */
    function X() { return "hello"; }
    // Strictly speaking you can't have FunctionDeclaration as a Statement (see http://es5.github.io/#x12)
    // However most implementations support this for compatibility reasons.
    // V8 for example hoists all FunctionDeclarations to the top level, just like it does with variable
    // declarations. This means in this case X is *not* created again and again everytime the loop is entered.
    // Essentially this loop becomes empty.

mraleph

Samples: 22K of event 'cycles', Event count (approx.): 18909447319                                                                                                                                                  
  Overhead  Command          Shared Object        Symbol                                                                                                                                                           ◆
+   17.39%  d8               perf-30177.map       [.] LazyCompile:ToString native runtime.js:328                                                                                                                   ▒
+   15.51%  d8               perf-30177.map       [.] Stub:CompareICStub                                                                                                                                           ▒
+   11.63%  d8               perf-30177.map       [.] LazyCompile:*a native array.js:621                                                                                    

mraleph

diff --git a/Dart_RaytracerDemo/web/SimpleRaytracer.dart b/Dart_RaytracerDemo/web/SimpleRaytracer.dart
index d02b6f7..458394b 100644
--- a/Dart_RaytracerDemo/web/SimpleRaytracer.dart
+++ b/Dart_RaytracerDemo/web/SimpleRaytracer.dart
@@ -34,9 +34,9 @@ import "dart:async";
 import "missing.dart";

  class Vector3f {
-     double x=0.0, y=0.0, z=0.0;
+     double x, y, z;

mraleph

function foo(x) {
  function getCapacity(smth) {
  }

  this.x = function () {
    getCapacity(yyy); 
  };

  return this;
} 

mraleph

new Fn(...) vs Object.create(P)

Basics of object layout in V8

Each JavaScript object in V8 looks like this

+-------+
|  map  | -> pointer to the hidden class
+-------+

mraleph

function B1() {
  /* Benchmark.prototype.setup goes here {{{ */
  var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
      seed_data = 3,
      result = 0;
  /* }}} */
  var start = new Date;
  while (...) { /* do N iterations of test body */
    /* body of the case goes here {{{ */
    for (var i = 0; i < arr1.length; i++) {

mraleph

~ ∮ dig cdnjs.com AAAA +short
2400:cb00:2048:1::a29f:f729
2400:cb00:2048:1::a29f:f829
~ ∮ curl -m 20 -v -o /dev/null -s -w "got %{size_download} bytes." -g --header 'Host: cdnjs.com' 'http://[2400:cb00:2048:1::a29f:f829]/'
* About to connect() to 2400:cb00:2048:1::a29f:f829 port 80 (#0)
* Trying 2400:cb00:2048:1::a29f:f829... connected
> GET / HTTP/1.1
> User-Agent: curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
> Accept: */*
> Host: cdnjs.com

mraleph

diff --git a/web/fc-app.dart b/web/fc-app.dart
index 9ab1b10..f8982d3 100644
--- a/web/fc-app.dart
+++ b/web/fc-app.dart
@@ -1,11 +1,30 @@
 import "package:polymer/polymer.dart";
 
 import "dart:html";
-import "dart:js";