[Tachyon-list] Global object property search optimization: first results

Experiments after having changed the lookup algorithm on the global object to test for the 3 first properties before doing a linear search show a .5 second speedup on a 2.13 GHz Intel Core 2 Duo Macbook for fib(40).

Fast lookup: user 0m3.702s

Original Linear search: user 0m4.339s

Those tests can be repeated by running:

time make test

in the two following branches, available on the tachyon repository:

globalOriginalLinearSearch globalFastSearch

The source code for the search algorithm can be found in 'codegen/ir-to-asm-x86.js' at line:

338: irToAsm.translator.prototype.get_prop_addr = function (opnds, dest)

Erick