#linuxcnc-devel | Logs for 2013-08-24

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[08:58:18] <memleak> Hi all, just an update on RTAI; I've been talking with Paolo and ShabbyX and we're going to try and get the github code merged into the CVS tree (finally) but the only reason Paolo hasn't is because some of the commits have not been fully explained yet.
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[08:59:29] <memleak> Over the next week or so that will be the primary focus, and hopefully we can either keep merging code from github into the official tree, or I could at least get commit rights to push my own.
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[13:46:32] <cradek> memleak: that sounds wonderful
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[14:35:38] <skunkworks> steve_stallings, How's things?
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[15:53:10] <seb_kuzminsky> i'm excited that the meeting looks short today
[15:53:40] <cradek> yeah, a good sign
[15:53:54] <archivist> or a bad sign
[15:54:50] <cradek> hmm
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[16:56:00] <jepler> whoops, I missed it
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[16:56:49] <archivist> http://meetlog.archivist.info/meeting.php?id=201308
[17:11:31] <JT-Shop> opps missed it
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[22:24:39] <andypugh> Is this something I have done accidentally? " hostmot2: Unknown symbol __divdi3"
[22:28:18] <andypugh> Hmm, I think I see the cause, if not the solution.
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[22:31:10] <andypugh> Got it, by casting to float before division.
[22:34:31] <andypugh> Ah, no, spoke too soon.
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[22:54:04] <jepler> When gcc encounters division of 64-bit integers that it does not translate as an inline instruction sequence, it emits a call to __divdi3: p/q -> __divdi3(p, q)
[22:54:11] <jepler> this function is not available in the kernel
[22:54:37] <jepler> in the header rtapi_math64.h we provide rtapi_div_u64 and rtapi_div_u64_rem for division and modulo of *unsigned* 64-bit quantities
[22:56:02] <jepler> If you require division of *signed* 64-bit quantities, then extend the header: for __KERNEL__ it would convert to a call to div_s64_rem or div_s64, and for non-__KERNEL__ it would be a call to the obvious thing
[22:56:14] <jepler> then at the problem site, rewrite p/q as rtapi_div_s64(p, q)
[22:56:53] <jepler> huh it's not actually used anywhere. weird.
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[23:02:33] <andypugh> At the point that I do the division I no longer care about the 64-bitness
[23:03:45] <andypugh> (assuming that I actually know where in the code the problem lies, I don't get a line number, or even an accurate clue to which file)
[23:04:00] <andypugh> WARNING: "__divdi3" [/home/andypugh/git/linuxcnc-dev/src/hostmot2.ko] undefined!
[23:04:42] <andypugh> As I have not changed hostmot2.c since the warning appeared, I am working on guesswork.
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[23:50:05] <KGB-linuxcnc> 03nieson 05master 8661285 06linuxcnc 10configs/sim/gmoccapy/ 10(14 files in 2 dirs) * gmoccapy 0.9.7 - first changes
[23:50:05] <KGB-linuxcnc> 03nieson 05master ac3d280 06linuxcnc 10(5 files in 2 dirs) * gmoccapy 0.9.7 - included iconview
[23:50:06] <jepler> hostmot2.ko is made up of all the source files listed in hostmot2-objs in src/Makefile
[23:50:08] <KGB-linuxcnc> 03nieson 05master dd855f1 06linuxcnc 10(10 files in 4 dirs) * gmoccapy 0.9.7 - with icon file selection dialog and some minor bug fixes
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