Currently I’m experimenting with jQuery (always being told prototype.js is evil). In my project I have to make quite some complex animations and I tried to detect if I can map them to the animate() syntax. Uh, and all hell broke loose. Here is my 24h experience:
You can’t animate regular DOM properties, like image width/height, [...]
Uh, sometimes you don’t know what’s in the mind of intel guys.
They state in their documentation that the movntq-op (taken over from MMXExt) has to take place on 16-byte aligned memory. What??? Either it’s a copy & paste error, it’s probably suppose to mean 8-byte aligned memory, or you got a command which can’t be [...]
Uh, I don’t know how I may introduce this one. I don’t know if I should call it a horrific failure or just hilarious. This is what comes out of VS2008 for a signed short division:
symSend = mergedNGram % numCases;
mergedNGram /= numCases;
The produced code:
00024 0f bf 86 2c 04
[...]
You never stop learning, I just explored how I can force a compiler into producing the sbb op on x86. It’s quite difficult actually, most of them produce for example cmp + seta + neg for the term -(a > b). In fact the only deterministic behaviour is with a very special ternery term (a [...]
Ei, once in a while you ask yourself about the (in)sanity of the X86-architecture. Well everybody knows, the ops offered by MMX upto SSE58942 are actually choosen by dicing 42 out of 255 possible once. Well I just don’t go too deep into emotional depression here. Just my list of missing and missguided ops:
pmulbw
pmulsdq
pmulhd/pmulld
paddsd/psubsd/paddusd/psubusd
pmaddbw
pmadddq
pmaddubw/pmadduwd/pmaddudq
psadwd (horizontal [...]
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