archagon

# GDC Vault videos can't be watched on mobile devices and this is a very sad thing indeed!
# (Note: this has changed for GDC2013, which lets you watch raw MP4 streams. Kudos!)
# This script is designed to circumvent this by downloading the lecture and slideshow
# videos which can then be re-encoded into whatever format you wish. Obviously, you
# won't be able to do this without access to the Vault. This is strictly for the
# convenience of legitimate Vault users!

# Note: this code is rather flimsy and was written as fast as possible for my own personal use.
# The code only works for the most recent GDC Vault videos, since they all use the same player
# format. If the XML format used to run the player is changed (as it  has in the past), the code

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

rygorous

// float->half variants.
// by Fabian "ryg" Giesen.
//
// I hereby place this code in the public domain, as per the terms of the
// CC0 license:
//
//   https://creativecommons.org/publicdomain/zero/1.0/
//
// float_to_half_full: This is basically the ISPC stdlib code, except
// I preserve the sign of NaNs (any good reason not to?)