Comment #18 on issue 2513 by [email protected]: life benchmark slowness
http://code.google.com/p/v8/issues/detail?id=2513
does speed it up by 2x. But it is still 7x slower
2x? I'm seeing much more than that:
$ time out/ia32.release/d8 life.js
...
real 0m20.181s
$ time out/ia32.release/d8 life-fixed.js
...
real 0m1.429s
$ diff -u life{,-fixed}.js
--- life.js 2013-07-11 14:21:01.544928672 +0200
+++ life-fixed.js 2013-07-15 09:37:16.448983729 +0200
@@ -2566,7 +2566,7 @@
i15 = i12;
i16 = i10;
do {
- i15 = ((HEAP32[i3 + (((i16 + 32 | 0) % 32 | 0) + i14 << 2) >> 2] |
0) != 0) + i15 | 0;
+ i15 = (((HEAP32[i3 + (((i16 + 32 | 0) % 32 | 0) + i14 << 2) >> 2] |
0) != 0) | 0) + i15 | 0;
i16 = i16 + 1 | 0;
} while ((i16 | 0) <= (i11 | 0));
i16 = i13 + 1 | 0;
it is equally useful to optimize bool|X as it is bool+X? Both coerce (to
an int or to a number)
Unfortunately it's not that easy:
true + 1 = 2
true + "1" = "true1"
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