mtklein

8 ms·

91.
by mtklein 11y ago
Left over Up over UpperLeft for Paeth That's a,b,c when your pixels are labeled c b a d the same order you write the predictor p = a+b-c.
92.
by mtklein 11y ago
Though, it does seem like anyTrue() and allTrue() are pretty non trivial on ARM with NEON. Those functions seem pretty geared towards x86 movemask/ptest instructions. I'd think those would have to be compound, if not serial, on
93.
by mtklein 11y ago
I'd argue most SIMD hardware instruction sets do support that. x86 has had pshufb since SSSE3 (most desktop+laptop, and ~all mobile x86), providing an arbitrary byte shuffle across 16 bytes, and NEON has vtbl, pretty much the same but
94.
by mtklein 11y ago
Last time I profiled Go code on a Mac, I just ran my binary as normal under Instruments. Seemed to work fine.
95.
by mtklein 11y ago
Sort of. Thumb requires that you use an 'it' instruction before a block of up to 4 conditional instructions. Think "if-then". You can make each instruction a 'then' or an 'else' by instruction vari
96.
by mtklein 13y ago
On a related note, if you're using new and delete you can simply delete a pointer-to-const without jumping through any const_cast hoops, though I often wish I had a way of blocking that for APIs where the callee doesn't take owner
97.
by mtklein 13y ago
or maybe just #define copy_c_str strdup ?
98.
by mtklein 14y ago
Am I missing something, or isn't 1.6 * 2^-4 = 1.6 / 16 = 0.1? Seems exact to me.
99.
by mtklein 14y ago
Amazing. I've always wanted exactly this, and now I have it: bind right:alt push right bar-resize:screenSizeX/2 bind left:alt push left bar-resize:screenSizeX/2 bind up:alt push left bar-resize:screenSizeX*2/3 bind down:alt
100.
by mtklein 15y ago
Every time I read the headline for a fast algorithm for inverse square root I think "Well, yeah, you just multiply the input by itself. Can't get much faster to undo a square root than that." Silly me.
101.
by mtklein 15y ago
I just took a look at the output of gcc on -O1,-O2,-O3,and -Os (using the -S flag to output assembler.) It appears that with -O1 or -Os enabled, gcc turns the double recursion into single recursion. This makes the algorithm scale O(n) inste
102.
by mtklein 15y ago
Nice shibboleths!
103.
by mtklein 15y ago
I wanted it to be in Latin...
104.
by mtklein 15y ago
They gave me a wrist-slap call when I used 2.x TB in a month. That was before I realized there was a 250GB limit on my unlimited plan...
105.
by mtklein 16y ago
A multiple of 24 like, say, 120? I'd always thought that 120Hz TVs were being pushed because 120 is a multiple of both 24 and 30.
106.
by mtklein 16y ago
For something that simply works without any painful hacks, Android 2.2+ has a built-in WiFi hotspot feature. Turn it on and you've got a personal WiFi network that goes out to the world over your mobile's data connection. I've used it for
107.
by mtklein 16y ago
I marked myself as both applied and rejected, and applied an hired. When I was an undergrad I was rejected for a summer internship. Bummer. Then in grad school I was trying to go for a specific internship along with a professor I knew, a
108.
by mtklein 16y ago
And last I looked, that's how Chrome/Linux works too, at least on Ubuntu. When you download and install the deb, it'll set up apt sources so you get updates through the system.
109.
by mtklein 16y ago
I'd always thought that a log-structured filesystem is uniquely suited to spinning rust drives, as it never has to seek its head---it just keeps writing.
110.
by mtklein 16y ago
Works fine on the same version on Mac. Of course, ctrl-n normally goes down a line on a Mac.
111.
by mtklein 16y ago
It gets fantastically huge when you look at quoted searches. Sure, you can build an index of key words to documents containing them, but how do you build an index for literal text searches like "to the bridge, he said"?
112.
by mtklein 16y ago
Probably Chrome Frame, which lets you run Chrome in IE.