ScummVM IRC Log - 05 Jan 2018

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[04:49] <GitHub27> [scummvm] dafioram opened pull request #1107: SCI32: Fix PQ4 Barbie patch Selector (master...PQ4_BarbiePointsSelector) https://git.io/vNJOv
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[05:31] <GitHub172> [scummvm] rsn8887 pushed 1 new commit to master: https://git.io/vNJ3D
[05:31] <GitHub172> scummvm/master b2cf5a3 rsn8887: PSP: adjust cursor refresh to better match speed it had before it became smooth
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[08:32] <Strangerke|work> hi guys
[08:32] Action: Endy waves from the Pit of Kernel Patching
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[20:05] <tsoliman> Endy is it kernel patching or the LKML drama?
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[21:45] <Lightkey> ooh! DarkSaber2k is streaming Death Gate on twitch.tv/gogcom right now and mentioned that the publisher Piko Interactive, which re-released it also got the rights to titles from other companies, quite a list: https://pikointeractive.com/blog/happy-2018-important-announcements-for-2018-and-the-future/
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[21:53] <GitHub180> [scummvm] rsn8887 pushed 1 new commit to master: https://git.io/vNU97
[21:53] <GitHub180> scummvm/master e789841 rsn8887: PSP: fix bit shifts of cursor x/y, fix too-slow cursor
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[21:57] <rsn8887> Turns out is not a good idea to bitshift a _signed_ int.
[21:58] <rsn8887> On some platforms it works as expected for negative numbers, on others it doesn't.
[21:58] <rsn8887> I guess PSP is "others"
[22:17] <snover> rsn8887: indeed, shifting a negative integer is UB.
[22:19] <snover> well, UB for << and IB for >>
[22:19] <snover> it is good to know that it is a problem for that platform specifically, so thank you for mentioning it.
[22:38] <snover> in general, when doing arithmetic, just do the arithmetic, and the compiler will optimise it into the fastest operation.
[22:40] <tsoliman> is there a zero fill right shift in C++ (it is >>> in Java)
[22:44] <snover> i think that would mean that >> of a negative number would not be an implementation-defined operation.
[22:45] <snover> i mean, the answer is no, the long answer is that >> of a negative number may or may not shift the sign bit, its up to the implementation to decide
[22:46] <snover> if you want to guarantee a zero fill, casting to unsigned and then shifting would do that
[22:47] <tsoliman> oh so casting a -5 int16 to a unit16 results in 5?
[22:49] <tsoliman> (I guess I imagined it would do the dumb thing and just fit the bytes into the new type)
[22:49] <snover> a reinterpreting or c-style cast doesnt change the representation, just the way it is interpreted. in that case a -5 would end up being 65531 for twos complement representation.
[22:54] <snover> (the bit pattern of -5 in a 16-bit number is 1111111111111011)
[22:54] <snover> (twos complement*)
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[00:00] --- Sat Jan 6 2018