Previous day | Jump to hour: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | Next day

Seconds: Show Hide | Joins: Show Hide | View raw
Font: Serif Sans-Serif Monospace | Size: Small Medium Large

Click in the nick column to highlight everything a person has said.
The Logo icon identifies that the person is a core developer (has commit access).

Notice: Only Gecko based browsers prior to FF4 support the multipart/mixed "server push" method used by this log reader to auto-update. Since you do not appear to use such a browser, this page will simply show the current log, and not automatically update.

#rockbox log for 2010-01-02

00:12:01 Quit toffe82 (Read error: 110 (Connection timed out))
00:13:54***Saving seen data "./dancer.seen"
00:17:54stripwaxsaratoga - one other thing tremor does is use very few temporary variables - i'm pretty certain that, if you take the address of a temporary variable (as we do in all those TRANSFORM macros), gcc will definitely create that variable on-stack which limits being able to optimse it away / combine registers / etc
00:20:50 Quit Zagor ("Leaving")
00:20:52saratogastripwax: is tremor actually doing any better?
00:20:56saratogalooking at it i don't think so
00:21:07saratogait uses fewer temporary variables, but it uses them over and over
00:21:19saratogafor example mdct_butterfly_16
00:22:04 Quit MethoS- (Read error: 104 (Connection reset by peer))
00:22:11 Quit Omlet^away ("( :: NoNameScript 4.22 :: )")
00:22:14saratogai think its basically the same as what we do
00:22:30saratogaand the solution on ARM for Tremor was to write those butterflies in asm
00:23:07stripwaxI mean, tremor never takes the address (via &) of any of those temporary variables. So they can all be registers.
00:23:27stripwaxOnly the real memory writes go via &
00:23:58stripwaxMaybe I shouldn't be using XPROD31/XNPROD31 in TRANSFORM macros..
00:24:34saratogadoes the ffmpeg one do that?
00:29:02stripwaxffmpeg doesn't use any macros for multiplying (doesn't need to, as no fixed point / asm to deal with, so it just has x = a*b , etc). But CMUL in ffmpeg doesn't take pointers as args, whereas our one for some reason does. CMUL and XNPROD31 basically do the same thing.
00:29:35saratogathats probably my fault for CMUL
00:29:54stripwaxSo if the results are not intended for memory, would be better to use a macro that doesn't require pointers (e.g. something like XPROD32).
00:30:36stripwaxI'll cook up a couple simple ones and see if it improves anything
00:31:04 Quit Bagder ("It is time to say moo")
00:31:11CIA-6New commit by 03tomers (r24137): FS #10886 - Hebrew glyphs for 08-Rockfont.bdf ...
00:32:11 Join webguest10 [0] (
00:32:44 Quit webguest10 (Client Quit)
00:33:35saratogaugh addr7, r0, #8 then ldr r3, [r7, #4]
00:33:45saratogathats the same as just doing ldrr3, [r7, #12] right?
00:34:31saratogaerr ldrr3, [r0, #4]
00:34:40saratogaerr ldrr3, [r0, #12]
00:34:49saratogawhat the hell is the compiler doing
00:34:51stripwax:) right unless you also (need to) reuse r7?
00:35:15saratogait does not
00:35:20stripwaxif they all look like that, then yeah, that sounds really crappy
00:35:43saratogai see why doing these butterflies in ASM for Tremor speed things up so much
00:35:54saratogagcc seems terribly confused by them
00:42:47saratogahow many registers can I actually use on ARM? r0 through r12 or can I use more?
00:47:27stripwaxI think all but pc really
00:48:34stripwaxr0 thru r4, and r12, are all scratch. everything else you should be able to save/restore on entry/exit. r15 is the pc. Oh, and stack pointer probably best left untouched too unless you're definitely not stacking/calling/doing anything..
00:49:17saratogaso thats r0 through r13?
00:49:24 Nick kramer3d is now known as kramkram (n=kramer@unaffiliated/kramer3d)
00:51:31stripwaxsp is actually r13. so r0 thru 12, plus r14 (also called lr)
00:51:53 Join opensrcguy [0] (
00:51:59stripwaxagain, provided you push/pop the ones that aren't {r0-r3,r12} before using them
00:52:22saratogai'd forgotten how much i hate doing asm
00:52:52opensrcguyWhat is the SVN address for the RockBox SVN? I do not want to browse it with a web browser. I am using a real SVN client
00:53:17stripwaxsvn:// check the wiki pages for UsingSVN.
00:55:07opensrcguyhmm... I have tried that with no success
00:55:20stripwaxcheck the wiki pages...
00:56:08opensrcguyI will
00:56:28saratogaits annoying that ldm can't stride by two words at a time
00:56:48opensrcguygot it
00:56:55 Join StealthyXIIGer [0] (n=stealthy@
00:57:10stripwaxopensrcguy - depends if you want trunk or not ;-)
00:57:19opensrcguyoh no
00:57:26opensrcguyI just want to start exploring there
00:57:34opensrcguyI am going to get the mini2440 port
00:57:49stripwaxsaratoga - yeah, .. but when/where do we need that?
00:58:14saratogafor butterflies, then i could load just the real parts in one stride
00:58:25saratogasince they're stored interleaved
00:58:37stripwaxcan't we just load them all (real+imag) in one go?
00:59:24saratogayeah but i won't have enough registers to store them all, and all the results
00:59:33saratogaso i won't be able to use stm to write them back out
01:03:01 Quit pamaury ("exit(*(int *)0 / 0);")
01:03:48 Quit bmbl ("Bye!")
01:04:07stripwaxsaratoga - which piece of code are you looking at
01:04:35stripwaxah right
01:04:47saratogai think the best i can do is one ldm and two seperate stm
01:04:54saratogawhich isn't bad
01:05:08saratogaonly wastes a few cycles due to lack of registers
01:06:02stripwaxhave you seen how mdct_arm.S does butterfly_8 ?
01:06:41opensrcguyDoes anybody know about the port to the mini2440? It has an ARM9 processor
01:06:57 Join bmbl [0] (n=Miranda@unaffiliated/bmbl)
01:07:09opensrcguyin crt0.asm I see there is a call to map_section but I cannot find where that function is at
01:07:12stripwaxYou have 8 inputs and 8 outputs, but it should be possible to reuse some of your input registers for the output results (and the intermediate results also)
01:07:32saratogastripwax: hmm let me see how they do it
01:08:16saratogaoh wow thats a lot smarter then I
01:12:13stripwaxsaratoga - there's an awful lot of embedded assumptions in that butterfly_8 code (due to it being very intricately inlined with the rest of the stuff in butterfly_16) - e.g. incrementing the address args directly, and not actually doing any register stacking at start/end of butterfly_8. but the core idea should be very reusable
01:12:31saratogai don't think its quite the same thing as fft4
01:12:35stripwaxit's not
01:12:48saratogabut yeah i should be able to step through in similar order
01:13:10saratogaits really stupid that i'm doing this, a computer would be so much better
01:13:36stripwaxO2 / O3 definitely didn't do any better on that code?
01:14:31saratogai've got them if you want to see
01:14:35saratogawell i didn't try O3
01:14:48 Nick dys`` is now known as dys (
01:15:00 Quit bertrik ("De groeten")
01:15:26saratogaO2 is even longer then O1, which is ridiculous
01:15:31saratogai don't know how it managed to add more ops
01:15:36stripwaxisn't O2 supposed to be 'minimize size' ?
01:15:54stripwaxor am i misremembering / thinking about vc++
01:16:18saratogathats Os
01:17:56 Join kramer3d [0] (n=kramer@unaffiliated/kramer3d)
01:19:05stripwaxwonder if that would play nicely.
01:20:14saratogawow this is actually really easy and i just suck
01:20:29saratogai have registers left over
01:21:06saratogawhat is the point of rsb on arm?
01:21:08stripwaxI'm wondering if it's possible to coax gcc to do almost-as-good-a-job as that somehow with some smallish code tweaks. it would be much better to *not* have to manually hand-tune the asm
01:21:20saratogaisn't it the same as sub with the operands flipped?
01:21:21stripwaxsaratoga - so you can still do tricks with the second operand
01:21:30saratogaoh for shifting?
01:21:31stripwaxe.g. shifts
01:22:00saratogagcc uses it sometimes instead of sub without touching the second argument
01:22:02saratogai wonder why
01:23:42*stripwax shrugs
01:24:01 Quit opensrcguy ()
01:24:23stripwaxalso second operand doesn't have to be a register, but first operand does
01:24:25stripwaxI think
01:24:33stripwaxe.g. rsb r0, r0, #0
01:25:14stripwaxok. so with some tweaks, gcc seems to spit out something almost reasonably, with some ldmias in it
01:25:21stripwaxno stmias unfortunately
01:25:21 Quit kramkram (Read error: 60 (Operation timed out))
01:25:51stripwaxI'll try profiling it and see if it makes any/much difference
01:27:42 Join jordan` [0] (n=jordan@
01:31:17stripwaxnot profiling. i mean just test_codec thing.
01:33:24 Quit bmbl (Client Quit)
01:36:36 Join Space [0] (
01:41:47 Quit Spaceghost (Read error: 60 (Operation timed out))
01:45:02 Nick Space is now known as Spaceghost (
01:53:01 Join MethoS- [0] (n=clemens@
01:59:56 Quit domonoky1 (Read error: 54 (Connection reset by peer))
02:08:42saratogado i have to store all registers I touch ?
02:08:58AstroBoionly if you need them again
02:09:53saratogain a function call that is
02:10:21stripwaxor if you are being called from regular C, which will assume that you preserve anything in the range r4-r11+r13-r15 if you modify them
02:11:05saratogaso I only need to do stmdbsp!, {r4, r5, r6, r7, r8, r9, r10, r11}?
02:11:43saratogaand I guess I should try to use r14 then if its free
02:12:13saratogawhich one is lr?
02:12:14stripwaxassuming that you won't be modifying r13 (=sp) or r15 (=pc). lr=r14
02:12:27stripwax= function return address
02:12:29saratogai don't touch 14
02:12:46stripwaxok, no need to stack it in that case
02:12:57saratogai'll rearrange my registers to touch fewer important ones
02:13:21saratogawhat happens to r1-r3 when you call? does the caller automatically stack them if it needs them?
02:13:31saratogaor does the compiler purposefully not use them around function calls
02:13:57***Saving seen data "./dancer.seen"
02:14:54stripwaxthe compiler uses r0 thru r3 for function arguments (the first four arguments to the function).
02:15:19stripwaxit assumes the function won't preserve their values, so if the caller needs to reuse the values after function returns, the caller will need to store them before calling
02:16:04saratoga34 clocks when inlined assuming no memory latency
02:17:19saratogagcc used 63 clocks
02:17:25saratogaso a factor of 2 improvement
02:17:32stripwaxpresumably fft16 would (=could) reuse some of those fft4 results without needing to store/reload ?
02:17:40stripwaxI'm not sure how much benefit that would yield
02:17:47stripwaxhey that's pretty good
02:18:04stripwaxwhat's the performance on target like?
02:18:07saratogano idea
02:18:12saratoganot even sure if its correct :)
02:18:55saratogaif I declare this inside a .S file can it still be inlined without stacking everything?
02:19:13saratogaor should I make it an asm block inside a c function?
02:23:57Unhelpfulsaratoga: you can't inline into C code from an asm function... and doing so with an asm block is going to work best if you declare any scratch registers as output of the block instead of using fixed registers and clobbers.
02:24:29saratogaUnhelpful: so just list r1-r12 as outputs?
02:25:43Unhelpfulsaratoga: well, you have to use temp variables in the surrounding C code, and then used them as outputs in the asm block, and use them in the asm instead of using specific clobbers. ie, "add %[tmp1] ..."
02:26:04Unhelpfulthat will allow registers in the asm block to be subject to compiler register allocation
02:26:05saratogawhy is that better then clobbering?
02:26:11saratogaah ok
02:26:53Unhelpfulfor example if you repeat a block twice that produces a single output value it will have more flexibility about where to save the output from the first copy, instead of just having to avoid all of the explicit clobbers
02:30:38saratogais that what you mean?
02:32:06Unhelpfulah, heh, well if you're going to use ldm you *have* to use explicit registers for whatever it touches, since ldm must be in-order...
02:33:04saratogaso just clobber them?
02:33:39stripwaxis it possible to have asm that has no 'output' registers?
02:33:48stripwaxthe only output of this is really memory
02:34:50saratogai keep getting an impossible constraint error
02:34:58saratogaam i doing the input correctly?
02:35:00 Quit StealthyXIIGer (Read error: 110 (Connection timed out))
02:35:21 Join Strife89 [0] (
02:36:23stripwaxshouldn't it be just "r" ?
02:37:01saratogainstead of a?
02:37:24stripwaxyeah, I think so. what is "a" ?
02:37:49saratogai don't know
02:37:57saratogaam i not allowed to ahve comments in an asm block?
02:38:00saratogaits erroring on those now
02:38:06stripwaxalso, shouldn't you refer to it as %[r0] or something? rather than r0.
02:38:36Unhelpfulsaratoga: i usually just use C comments...
02:39:20stripwaxshould be C comments. you also need ; ends for each asm line - looks like you're missing ; from some lines (or are you using ; as a comment?)
02:39:40Unhelpfuland i wouldn't bother with the temps-as-outputs if you already *have to* use explicit clobbers due to ldm/stm
02:39:41stripwaxtake a look at lib/asm_arm.h for examples
02:41:00stripwaxalso - you don't need "cc" clobber here. there's no condition code flags on those instructions.
02:43:17saratogai don't think i need semi colons
02:44:58saratogathe assembler is not happy
02:45:08stripwaxhow would it know where the instruction ends, if you don't have semicolons?
02:45:36stripwaxremember, this is going through the C preprocessor. all those strings just get concatenated into one long string
02:45:46saratogait needs new lines
02:46:09stripwaxsee asm_arm.h - I don't think you *need* newlines (e.g. vect_add)
02:46:38stripwaxat a guess, you need either one of semicolons or newlines, I suppose
02:47:36stripwaxyou still need to use "%[r0]" in the asm, not just "r0" though.
02:47:40Unhelpfulstripwax: anything the assembler will accept as ending a statement...
02:47:51stripwaxgood point
02:48:12Unhelpfulstripwax: um... why would he need to use %[r0] unless that refers to a named input or output variable?
02:48:23stripwax- because it does?
02:48:41Unhelpfuloh, it does? that's confusing :)
02:48:56saratogadata aborts
02:49:04saratogai bet i have the ldm instructions wrong
02:49:10stripwaxcould set the inputs to be [z] "r" (z), instead of [r0] "r" (z), if it's less confusing
02:49:38Unhelpfulr1-r8 should just be clobbers because of the ldm. and for the address you do indeed need to use the named parameter.
02:49:39stripwaxsaratoga - is that with the r0 fix? Otherwise, I think the r0 register is basically not going to be assigned to z
02:50:09stripwaxso you're blatting over random memory locations probably :)
02:50:12saratogaso " : %[r0] "r" (z)" ?
02:50:46saratogahmm no
02:51:05stripwaxi.e. ldmia %[r0], blah
02:51:16saratogaoh you mean for ldm
02:51:30stripwaxor to make it less confusing- ldmia %[z], blah (and have [z] "r" (z) in the inputs section)
02:52:16stripwaxUnhelpful - he needs to clobber r9-r12 too. Or are you saying those four should really be local temp variables and have the compiler assign those?
02:56:17saratogastill no good
02:57:39stripwaxstill aborts?
02:59:45Unhelpfulstripwax: he could. i'm really not sure it will help any, but it might.
03:00:19Unhelpfulisn't there a way to specify a specific range of memory as clobbered or as an output?
03:00:28stripwaxI don't think so
03:00:44saratogawhy would that be needed
03:01:57Unhelpfulsaratoga: if gcc might have any values live in registers it should know it needs to reload them... in most cases it doesn't really matter.
03:02:33saratogaisn't that what the memory clobber handles?
03:02:39saratogaor did you mean just to be more specific
03:02:52Unhelpful"If you know how large the accessed memory is, you can add it as input or output but if this is not known, you should add `memory'. As an example, if you access ten bytes of a string, you can use a memory input like: "
03:03:08Unhelpfulsaratoga: a memory clobber will force reloads of *anything* from memory
03:03:28saratogalooking at vector_fmul_reverse it lists everything as an output, and its a very similar function (writes ldm mul then stm)
03:03:31saratogamaybe i need to do that
03:03:56stripwaxYeah but that one updates the address pointer
03:04:22stripwaxi.e. it returns the incremented pointer
03:04:22saratogaoh hmm
03:04:39Unhelpfulsaratoga: the pointer need not be an output if not updated. and clobbers are as good as outputs if you are using specific registers anyway, as you must with ldm/stm
03:04:42 Quit kramer3d ("Leaving")
03:05:04saratogaam i using ldmia wrong then?
03:05:21stripwaxI don't think so
03:05:49saratogahaha that fixed it
03:05:55Unhelpfulthere's an example here for how to clobber, input, or output a particular memory range:
03:06:03saratogaalthough the audio is a little corrupted, so i obviously have a mistake somewhere
03:09:46stripwaxinteresting. "you will want to add the volatile keyword if the memory affected is not listed in the inputs or outputs of the asm". but [z] is already in your inputs. So I wonder if you needed to put it into the outputs too and/or use "asm volatile" instead of "asm", in order for the "memory" clobber to work properly
03:09:50stripwax31.98 for 192kbps?
03:10:51saratogastripwax: yes 192k vorbis
03:11:25stripwaxso about 1MHz improvement
03:11:36stripwaxnot bad!!
03:12:27saratogawe'd get a lot more fixing hte other BFs too
03:13:42stripwaxfor the add/sub stuff, sure - but can only use the ldmia/stmia trick for fft4
03:13:46Unhelpfulsaratoga: you're only using ldmia wrong if you are also incrementing the pointer in C and not using the pre-increment value outside of the asm. if only the asm modifies each bit of memory and the pointer is only needed in C for loop boundaries you can make the stm update the pointer for you (assuming the next memory to access follows this piece
03:14:24saratogaUnhelpful: the poitner doesn't change at all
03:14:27stripwaxthe asm isn't incrementing the pointer
03:14:47saratogastripwax: i think it'll work in fft8
03:15:11stripwaxunhelpful - and it couldn't/shouldn't (not easily) because the value would need to be reused after the asm (not a simple loop)
03:15:32Unhelpfulsaratoga: then you're probably doing it right. if you were applying the same asm to consecutive blocks of memory you could declare the pointer an input/output and update it on the stm.
03:15:39saratogaalthough probably not as well since it'll probably run out of registers
03:16:07saratogabut still an extra stm or two is just 1 or 2 clocks wasted, still massive room for imrpvoement
03:16:58stripwaxsaratoga - right, it would require some extra careful rewriting by hand :) but I imagine a big benefit by writing fft8 by hand to *not* store all the fft4 results to memory [only store z[1] & z[3] immediately after fft4, because all the others need to be reused before writing]
03:17:15saratogaheres the almost working version if anyone wants to check my math:
03:17:22saratogai need to stop doing this for a while before i lose my mind
03:17:42stripwaxProbably need to just expand the equations in fft8 and do it all (again) by hand
03:17:51stripwaxRight - don't want anyone to lose their mind over this!
03:20:16stripwaxmaths looks right btw
03:21:15 Quit stripwax ("")
03:22:59 Quit DerPapst ("Leaving.")
03:43:29 Join Phyber0ptik [0] (
03:52:09Unhelpfulwhat a cliché, i figured out what is probably the best way to handle 32-bit inputs with my 31-bit divider while *in the shower*. could only have been worse if i'd been taking a bath or said "eureka" :P
03:53:26 Quit Phyber0ptik (Remote closed the connection)
03:57:55 Join kramer3d [0] (n=kramer@unaffiliated/kramer3d)
04:00:28 Quit tchan ("WeeChat 0.3.1-dev")
04:09:30 Join tchan [0] (n=tchan@lunar-linux/developer/tchan)
04:14:01***Saving seen data "./dancer.seen"
04:18:59 Quit Strife89 ("Bed.")
04:41:29 Quit efyx (Remote closed the connection)
04:47:01 Join kkurbjun [0] (n=kkurbjun@rockbox/developer/kkurbjun)
04:47:27 Quit froggyman (Read error: 104 (Connection reset by peer))
04:48:44 Join Barahir [0] (
04:49:13CIA-6New commit by 03kkurbjun (r24138): Brickmania: Scale bitmaps with the high-res bricks to fit them to the LCD width for the Gigabeat F/X/S.
04:51:17 Quit CaptainKewl (Read error: 104 (Connection reset by peer))
05:00:05CIA-6New commit by 03kkurbjun (r24139): Fix red.
05:02:19 Join dys` [0] (
05:04:15 Quit Sajber^1 (Read error: 54 (Connection reset by peer))
05:04:22 Quit Barahir_ (Read error: 110 (Connection timed out))
05:06:51 Join CaptainKewl [0] (
05:14:20 Quit dys (No route to host)
05:21:14 Part toffe82_
05:34:36 Join Llorean [0] (
05:51:07 Join BHSPitLappy [0] (n=BHSPitLa@unaffiliated/bhspitmonkey)
05:51:33CIA-6New commit by 03kkurbjun (r24140): Brickmania: Change the drawing/collision detection to simplify position management.
05:54:57 Quit GeekShadow ("The cake is a lie !")
05:57:02saratogarunning time is wrong on targets with software USB because its only updated if you go into charging mode, not USB
06:01:40saratogahmm actually it looks like you actually need to browse to the menu while its actively charging to reset it
06:04:19saratogais touching the global_status struct from /firmware ok?
06:04:39saratogait seems like the obvious solution is to just have the usb hardware update the running time counter on insert
06:10:13 Quit MethoS- (Remote closed the connection)
06:11:57 Quit fdinel ("Miranda IM! Smaller, Faster, Easier.")
06:11:58saratogaimo the power_thread should be managing the running time, not screen.c
06:14:04***Saving seen data "./dancer.seen"
06:18:13 Join StealthyXIIGer [0] (n=stealthy@
06:24:31 Join draeath [0] (n=pbransfo@unaffiliated/draeath)
06:25:27draeathI've got an e200r. I just recently updated to svn, and i find that when I connect USB, rockbox connects in MTP mode. I'd rather this not happen. I want it to behave like USB storage, or just reboot like it used to, letting the stock firmware handle it (which is configured for mass storage mode)
06:25:56saratogarockbox doesn't have MTP mode, so if you're getting MTP you're in the OF
06:26:02draeathI'd check again
06:26:26draeathIt does. it had a nice little rockbox splash too
06:26:55draeath(specifically stated MTP, and rhythmbox started up and behaved like an MTP player connected)
06:28:05saratogayou're probably confusing MSC with MTP
06:28:51saratogarockbox has an MSC usb mode where it shows up as a normal usb disk, but not MTP (which is where you don't have direct access to the disk)
06:29:39draeathI plugged in just now, shows a USB connector and says "Multimedia Mode" ?
06:29:55saratogathat would be MSC
06:30:17draeathHrm, but then hal or whatever is saying i connected a media player, rather than behaving like any random flash drive.
06:30:27draeathbut i do see /dev/sdd is available, so yea
06:31:42saratogaassuming thats linux, you might have this problem:
06:32:20draeathnah it reads it correctly. just wasn't expecting it to be treated "Special" now.
06:32:24draeathok well nevermind then :)
06:33:11draeathDo you happen to know if it charges in this mode, or do I still need the OF for that?
06:33:59saratogait charges
06:34:57draeathty saratoga
06:45:20 Quit Llorean ("Leaving.")
06:45:30 Quit saratoga ("Page closed")
07:01:40 Quit kkurbjun ("Leaving.")
07:02:46 Quit StealthyXIIGer (Read error: 110 (Connection timed out))
07:15:17 Part draeath
07:18:33 Join Llorean [0] (n=DarkkOne@
07:25:21 Join Llorean1 [0] (
07:32:38 Join S_a_i_n_t [0] (i=Saint@
07:42:08 Part S_a_i_n_t
07:42:23 Join S_a_i_n_t [0] (i=Saint@
07:42:58 Quit Llorean (Read error: 110 (Connection timed out))
07:48:09 Quit S_a_i_n_t ("[St.] S_a_i_n_t")
07:58:20 Join kcj1993 [0] (
07:59:50 Join S_a_i_n_t [0] (i=Saint@
08:02:53 Join AndyI [0] (n=pasha_in@
08:04:20 Part S_a_i_n_t
08:04:32 Join S_a_i_n_t [0] (i=Saint@
08:05:27 Quit S_a_i_n_t ("[St.] S_a_i_n_t")
08:05:45 Join S_a_i_n_t [0] (i=Saint@
08:14:07***Saving seen data "./dancer.seen"
08:14:27 Part kcj1993 ("Leaving")
08:14:37 Quit CaptainKewl (Remote closed the connection)
08:16:48 Quit AndyIL (Read error: 110 (Connection timed out))
08:24:43 Nick kramer3d is now known as kramkram (n=kramer@unaffiliated/kramer3d)
09:00:08 Quit SolarWar (Read error: 110 (Connection timed out))
09:14:06 Quit Xerion (Read error: 60 (Operation timed out))
09:15:17 Join PaulJam [0] (
09:21:22 Quit Spaceghost (Client Quit)
09:42:18 Join Tomis2 [0] (n=Tomis@
09:43:14 Quit kaniini (Read error: 60 (Operation timed out))
09:56:36 Join stoffel [0] (
09:57:23 Quit PaulJam (Read error: 60 (Operation timed out))
09:57:49 Quit Tomis (Read error: 110 (Connection timed out))
09:57:49 Nick Tomis2 is now known as Tomis (n=Tomis@
10:06:37 Quit xavieran (Client Quit)
10:08:54 Join bmbl [0] (n=Miranda@unaffiliated/bmbl)
10:14:10***Saving seen data "./dancer.seen"
10:41:45 Quit BHSPitLappy (Read error: 110 (Connection timed out))
10:41:45 Join xavieran [0] (
10:42:45 Join tomers [0] (
10:43:31 Join bertrik [0] (
10:45:40 Join pamaury [0] (
10:48:02 Join merbanan [0] (
10:50:52 Join Grahack [0] (
10:53:45 Quit AstroBoi (Remote closed the connection)
11:09:36bertrikFlynDice, I'm seeing some weird sd debug code in debug-as3525.c: on line 298 we do sd_enable(true) and on line 303 we do sd_enable(false) again
11:14:32 Join domonoky [0] (n=Domonoky@rockbox/developer/domonoky)
11:35:11 Join stripwax [0] (
11:36:52 Join PaulJam [0] (
11:44:39 Quit PaulJam (Nick collision from services.)
11:44:48 Join PaulJam_ [0] (
11:51:11 Nick dys` is now known as dys (
11:51:20 Quit merbanan (Connection timed out)
12:01:27 Quit kramkram ("Leaving")
12:08:49 Join Sajber^ [0] (
12:14:14***Saving seen data "./dancer.seen"
12:31:25 Join kugel [0] (n=kugel@rockbox/developer/kugel)
12:40:01 Quit yosafbridge ("Coyote finally caught me")
12:40:11 Join yosafbridge [0] (
12:42:07 Quit stripwax ("")
12:44:25 Join stripwax [0] (
12:49:54 Quit Grahack ("Tu m'as vu ?")
12:58:41 Join DerPapst [0] (
13:04:42 Nick rhodan__ is now known as rhodan (
13:09:15 Quit stripwax ("")
13:10:30 Quit tomers (Read error: 113 (No route to host))
13:12:25 Part S_a_i_n_t
13:13:07 Join S_a_i_n_t [0] (i=Saint@
13:53:47 Join Omlet^away [0] (
13:59:12 Join kaniini [0] (
14:07:07 Join Xerion [0] (
14:07:28 Join rhodan_ [0] (
14:11:08 Join dfkt [0] (i=dfkt@unaffiliated/dfkt)
14:14:15***Saving seen data "./dancer.seen"
14:19:32 Quit rhodan (Read error: 113 (No route to host))
14:23:40 Join GeekShadow [0] (n=Antoine@reactos/tester/GeekShadow)
14:29:48 Join efyx [0] (
14:31:49CIA-6New commit by 03torne (r24141): Add strlcat to core to match strlcpy (also add to plugin api). Some uses of strcat could probably do with being changed to this.
14:33:00Unhelpfulape_normal runs faster without the divisor-is-2^n test... it's about .47MHz faster on e200. i wonder how often the divisor-is-one test hits...
14:34:36 Quit stoffel (Read error: 60 (Operation timed out))
14:41:40 Quit kugel (Read error: 60 (Operation timed out))
14:58:40 Quit Omlet^away (Read error: 104 (Connection reset by peer))
15:08:20Unhelpfulremoving special-cases for both x/1 and x/(2^N) from udiv_arm gets APE down a bit further, to 81.82MHz. the num<den case might be worth removing as well
15:10:52 Join merbanan [0] (
15:16:18bertrikUnhelpful, so it actually gets faster by removing 'optimisations'?
15:20:54 Join kugel [0] (n=kugel@rockbox/developer/kugel)
15:22:47 Part S_a_i_n_t
15:23:02 Join BdN3504 [0] (
15:23:27Tornehm, what's the best way to handle conditional compilation of plugins that are very big?
15:23:52 Join S_a_i_n_t [0] (i=Saint@
15:24:02BdN3504i have a problem finding a patch which solved my problem i already described here:
15:24:29Tornefrotz currently needs 0xf630 bytes in pluginbuf which is too big for the archos targets, and it's likely to get bigger and not fit in the targets with 0x10000 either
15:25:02bertrikTorne, I think in apps/plugins/SOURCES
15:25:31Torneyes, but if i do it conditionally on PLUGIN_BUFFER_SIZE then i'm not sure how to put it in the manual
15:25:43Tornesince the manual only knows about large_plugin_buffer which is much bigger (the one added for Lua)
15:26:15bertrikI don't know
15:26:24BdN3504bertrik: you helped me then, could you help me now?
15:27:30 Join Bagder [241] (n=daniel@rockbox/developer/bagder)
15:27:57bertrikBdN3504, I have to go now, maybe in an hour or so
15:31:22 Join CaptainKewl [0] (
15:31:28UnhelpfulTorne: why not build it as an overlay plugin on small-buffer targets?
15:31:49Tornebecause i don't know what that is
15:31:59Tornealso if the plugin buffer is that small then there probably isn't enough ram to function usefully
15:32:02Unhelpfulbertrik: well, they're both very rare cases if you assume that the numerator and divisor are randomly selected from all possible values
15:32:11Tornefrotz steals the remainder of the plugin buffer to load the story file,a nd if that's not enough it steals the audio buffer
15:32:17Tornestories can be up to 512KB
15:33:08Tornehm actually
15:33:11gevaertsTorne: just revive the old bit-rotted low-mem code!
15:33:37UnhelpfulTorne: overlays load into the audio buffer. you'd have almost the whole plugin buffer for data and the remainder of the audio buffer after the plugin loads into it. pictureflow builds as an overlay plugin on lowmem targets... this works great on archos since it uses the plugin buffer for the slide cache
15:33:40Tornei dunno if i can even find it :)
15:33:49Tornethe swapping code is gone entirely :0
15:34:01TorneUnhelpful: ah right
15:34:25Tornethe story has to be contiguous so if the plugin buffer is less then 64kb then i probably can't fit the story in there either
15:34:50UnhelpfulTorne: so just grab the audio buffer if you're using an overlay? you've already stopped playback...
15:35:10Torneyes, i just need to make sure not to overwrite myself as the comments say
15:35:26Tornedidn't realise there was already a way to do this easily :)
15:35:36Tornei guess frotz can run on everything then, except the charcell devices
15:36:04gevaertsif you do overwrite yourself, someone will make use of that to write a bootloader
15:36:22Unhelpfulbertrik: also some of the special cases are probably *very* unlikely in the context of a range coder. i doubt divisors are exactly one or exactly powers of two very frequently.
15:37:36Tornegevaerts: actually using the low-memory version of the frotz code would be worse, because it's the interpreter binary that's too big for ram, not the story :)
15:37:41Tornethe story should always fit in the audio buffer
15:37:53Tornethe low memory version of the terp would be more code
15:38:06gevaertshm, true
15:38:32Tornefrotz is nearly done
15:39:13Torneundo is the only major thing left that doesn't work (expects malloc)
15:39:28kugelso use malloc
15:39:31Unhelpfulas i'm *also* planning to replace libgcc's divider, some of these special cases might be worth keeping there... but possibly not, saving (numerator size * 2) + 15 cycles, roughly, in the case of divisor == 1, is probably not worth 2 cycles in the common case...
15:39:38 Quit merbanan (Read error: 110 (Connection timed out))
15:39:38Tornekugel: naw, not worth it
15:39:41kugelplugins and codecs actually have it
15:39:52Unhelpfulundo is for sissies ;)
15:39:52Tornekugel: it only allocates and frees in a fixed sequence, the undos are a ring buffer
15:40:10Tornei can write a much more trivial implementation which will work
15:40:24TorneUnhelpful: indeed
15:40:48TorneUnhelpful: but there are interesting abuses of the save_undo opcode which might be nice to support
15:40:57Tornee.g. using it to do backtracking decision making ;)
15:41:32Tornesince it basically saves a delta of all the writable memory of the VM, you can use it for control flow a la setjmp if you are insane
15:41:34Unhelpfulthis divider can alos process numerator<divisor in probably about 20 cycles, so that might not be a worthwhile optimization either... although, with uniformly distributed inputs it should happen about half the time.
15:42:14UnhelpfulTorne: using it to backtrack in the story code, you mean? scary, sounds like an abuse. :P
15:42:16gevaertsTorne: people actually do that?
15:42:22Tornepeople do a lot of z-machine abuses
15:42:41*gevaerts can't help being impressed
15:42:45TorneUnhelpful: yes. it restores *all* state other than the return value of save_undo so it's even more drastic than setjmp/longjmp
15:42:53Torneyou can only communicate one bit of information through it
15:43:30gevaertsOne bit should be enough for everyone!
15:43:32Tornebut you can abuse it to avoid having an unbounded return stack for some insane algorithms
15:43:38*Unhelpful bets that's also a "can't-happen" case for ape :P
15:43:57Torneor at least to make the unbounded amount smaller
15:44:18Torneyou might do this if you were, say, implementing prolog
15:44:32Unhelpfulimplementing prolog. in z-machine.
15:44:35Torneor whatever other insane project you've come up with this month for your 80s virtual machine architecture
15:49:47*Torne wonders if anyone else wants to write a manual for frotz for him :)
15:50:17Tornealso, i was thinking about plugins leaking filehandles. Might it be worth doing something to prevent this?
15:50:31Unhelpfulremoving these three "optimizations" is worth about 1.23MHz on e200
15:50:40 Join Omlet [0] (
15:50:55 Join arohtar [0] (n=faemir@
15:52:20*Torne also grumbles about frotz wanting ungetc
15:53:10Unhelpfulhrm, this divider also appears to return 1 if the divisor exceeds numerator... that seems unright. :P
15:56:04 Quit faemir (Read error: 60 (Operation timed out))
16:05:26bertrikBdN3504, what is your question?
16:05:36 Join BeFalou [0] (n=mamutoi@unaffiliated/befalou)
16:12:13 Join stoffel [0] (
16:12:23gevaertsTorne: preventing that shouldn't be too hard with some open() and close() wrappers in plugin.c. I'm not sure if just closing all remaining open files is that useful though, maybe a panic is better...
16:13:58gevaertson the other hand, there's plenty of precedent for autoclosing any remaining handles
16:14:16***Saving seen data "./dancer.seen"
16:14:17gevaertstsrs might need some special handling
16:14:22pamauryA panic is better because when a plugins leak filehandles, it is BAD, it should be fixed. I'm not sure adding some code to prevent it is a good way to tackle the problem.
16:14:22Unhelpfulgevaerts: the open call might be in core code (say, opening an image by filename)
16:15:05Unhelpfuldoes core track number of open handles? you could check those before and after starting the plugin...
16:15:22CIA-6New commit by 03unhelpful (r24142): Remove special cases from udiv32_armv4.S, except for zero divisor and large numerator. Improvement of 1.23MHz on e200 with ape normal.
16:15:23pamauryno but it easy to count
16:15:40gevaertsnot good enough. Other things might open files while the plugin is running
16:15:43bertrikI'd rather see a panic than some mechanism to autoclose
16:15:57pamauryI agree, that would be too complicated and error-prone
16:16:37gevaertsI don't think it would be that complicated
16:16:57bertrikwe could increment a counter for each successfully opened file and decrement it for each successful close in the plugin api, and check that it is 0 at plugin exit
16:16:58pamauryHum, how would you know if the open is done from a plugin or not ?
16:17:25pamauryThat would mean adding code for each function in the plugin api that could possibly open a file
16:17:36gevaertspamaury: plugins go through rb->, so you can easily add a wrapper
16:18:06Unhelpfulpamaury: i think only for ones that pass a file back. if a core function leaves a file open that's not a plugin bug...
16:18:06gevaertsbut yes, the problem is those less obvious functions
16:20:12*gevaerts agrees
16:20:50pamauryWhich functions can lead to an unclosed open/opendir ? There are open, opendir of course and then ?
16:21:15gevaertsunless you get something else back that you have to release, but I'm not sure if there are any functions like that
16:22:20pamauryWhat about functions that play a sound ? How is it handled ? The buffering code handles that ?
16:24:38BdN3504bertrik: hi, i described my problem here and you posted a patch to pastebin. i idiotically didn't keep a copy of that patch
16:24:50kugelUnhelpful: is that udiv32 faster than the gcc div routine? if yes, why don't we use it in the core also?
16:25:14BdN3504what it does: it disables the play button and assigns the rec button the play button function
16:25:15gevaertsyou can either control the playlist, in which case the core handles it, or play raw samples, in which case you're not passing file handles
16:25:36CIA-6New commit by 03unhelpful (r24143): Add missing EOF newline.
16:25:45Unhelpfulkugel: that's next :P
16:25:54pamaurygevaerts: what about bufopen/bufclose. I have no knownledge of audio code
16:26:09gevaertshm, no idea
16:27:22bertrikBdN3504, I still had this patch locally, I think it's the same as the one discussed earlier:
16:28:09BdN3504nice!!! thanks a lot!
16:28:42kugelUnhelpful: wasn't the div routines the only reason that we link libgcc?
16:29:09gevaertspamaury: no plugin actually calls them
16:29:36pamauryok, so only open and opendir seem to be concerned
16:30:06 Join Utchybann [0] (
16:30:51 Quit jae ("Lost terminal")
16:31:05gevaertswhat I would do is keep open files in a bitmap
16:31:41gevaertsMore reliable than just a counter in case of multiple close() calls
16:32:27pamauryyou mean creating a bitmap was_opended_by_plugin such that was_opended_by_plugin[fd]=true iff fd is still open and the open was called by a plugin
16:33:16gevaertsyes, except that I'd just use one unsigned int
16:33:19pamaury(array or bitmap, implementation detail)
16:34:08pamauryThat's seem easy and much more reliable than a counter of course. A counter is not sufficient anyway
16:34:21gevaertsif you do it that way close-on-exit is a trivial extension
16:34:53pamauryWe could close on exit and warn the user or panic or I don't know but the user you know to give feedback
16:35:04pamaury*should know
16:35:43bertrikhow do you know which bit to set in the bitmap?
16:36:12pamaurywith the fd
16:36:27pamaury(with the return value of open)
16:36:46bertrikcan we guarantee limits on the range of the fd?
16:37:16gevaertssure, that's the maximum number of open files, currently 8
16:37:41gevaertsah, ok
16:37:43bertrikoh, ok only 8 or 11 files currently, didn't know that
16:37:53pamauryThat's quite a limitation
16:38:20pamauryThat's a good reason we fight against un-closed handles
16:38:26gevaertsYou could do an array of unsigned ints, and some preprocessor magic to make it all work for >3w
16:39:07gevaertsor just an #error if it's set too high...
16:39:23bertrikI like that idea
16:39:27pamauryan #error is probably sufficient for now
16:39:59*kugel thinks a counter is sufficient
16:40:04gevaertsor a #warning and disable the guard
16:40:23pamaurykugel: a counter can't be sufficient
16:40:45kugelbecause the plugin needs to be fixed anyway, there's no need for closing leaked fds
16:41:06pamauryno I mean, it's not a reliable way to determine if it leaked or not
16:41:09gevaertskugel: it's counter++ vs bitmap|(1<<fd), not that much difference
16:41:41pamaurywhat if another part of code opens a handle ? Say mtp for example, because you can do other things at the same time
16:41:49 Quit BdN3504 ("CGI:IRC")
16:41:53 Join bluebrother [0] (n=dom@rockbox/developer/bluebrother)
16:42:22kugelI thought only open() in plugins count
16:42:29gevaertspamaury: it would presumably still be in a plugin wrapper
16:43:07pamauryah yes
16:43:31pamaurya bitmap uses the same space and we have free close on exit
16:43:38*gevaerts thinks that the extra cost of a bitmap over a counter is small enough to go for the bitmap
16:43:42kugelgevaerts: except that bitmap|(1<<fd) is quite limited
16:43:56kugeldoesn't really matter unless we were to up the limit
16:43:57gevaertskugel: in what way?
16:44:13gevaertswe're at one third of the limit now
16:45:12bertrikI think a mechanism like this would be useful in the core too
16:45:38 Join rhodan [0] (
16:45:44gevaertsthe bitmap will (or at least can) catch double close, while those would just break a counter
16:46:07gevaertsbertrik: it would, but it's a lot harder there I think
16:46:55bertrikgevaerts, I don't see why (yet)
16:47:02gevaertsThere's no real point at which you know the expected state
16:47:50gevaertsand it's a lot harder to know where an open or close is called from
16:48:02bertrikah yes of course
16:48:18bertrikit could catch a double close, but that's about it
16:49:09 Quit rhodan_ (Read error: 60 (Operation timed out))
16:49:32gevaertsyou could make a debug screen that shows which files are open, and which thread opened them
16:51:12pamauryHow do you know the thread ?
16:51:21pamaury(that would mean adding code ?)
16:52:14gevaertsit's extra code, yes
16:52:33pamauryonly for debug build, if I understand
16:53:21gevaertsyou could do it for all builds, but that seems a bit wasteful
16:54:04kugeldid anyone ever do a debug build?
16:54:14pamaurydebug build=build with debug menu for me
16:54:27kugelthat's the normal build
16:54:42pamauryyes but I didn't want to write the entire sentence
16:55:14kugelI mean if you say "only for debug build" you still mean all builds :)
16:55:33 Quit efyx (Remote closed the connection)
16:58:21kugelthe debug menu is in all builds
16:59:07pamauryreally ? I thought it was only an option (configure asks for it)
16:59:35gevaertsthe menu is always there
16:59:46pamaurybut not accessible ?
16:59:54gevaertsit is
17:00:51bertrika debug build for the sansa clip doesn't compile here, I'll try to make it work (and commit the changes later)
17:01:46 Join efyx [0] (
17:02:34pamauryWe could have a very special build which do stack-trace each time open is called to see where it leak ;)
17:02:36kugelfunman seems to have success
17:03:32CIA-6New commit by 03bertrik (r24144): Simplify some boolean expressions that compare directly against 'true'
17:04:15 Quit dys (Read error: 104 (Connection reset by peer))
17:04:32 Join dys [0] (
17:05:16bertrikkugel, cool
17:09:25kugellet's hope his patch also works on the e200v2
17:09:41kugelmc2739: ping :)
17:10:27kugelmc2739: have you seen funman's latest patch?
17:11:11mc2739kugel: yes, I'll test when I get back in about 30 minutes
17:12:36pamaurygevaerts: so, we go for this bitmap solution ? I can implement that if there's no objection
17:13:38gevaertspamaury: I'd go for that one, yes
17:14:06pamauryOk, I'll do that today if I have time or tomorrow, that's shouldn't be long
17:14:24gevaertsI might have a go now...
17:14:48pamauryok, do so
17:16:58 Quit arohtar (Read error: 60 (Operation timed out))
17:17:01*pamaury thinks is still have a dircache bug to fix but delay the day when he will have to dive into it...
17:18:09 Join evilnick [0] (i=457288ab@rockbox/staff/evilnick)
17:18:53 Quit dys (Read error: 104 (Connection reset by peer))
17:19:11 Join dys [0] (
17:27:47bertrikwe have a lot of source files without svn:keywords
17:31:05 Quit dys (Read error: 104 (Connection reset by peer))
17:40:36 Join Highlander [0] (
17:42:39 Quit PaulJam_ (Read error: 110 (Connection timed out))
17:47:06gevaertsOK, I've added FS #10889
17:49:15pamaurygevaerts: seem ok to me but I'll test it. Are you sure logf on exit is sufficient ? It a silent error
17:49:44gevaertspamaury: I know. I think we need a bit more discussion to know what exactly to do when detecting the issue
17:50:11pamauryyes, did you test it with a crappy plugin to check ?
17:50:43pamaury(also perhaps printing the leaked files is a good thing to help debugging on error)
17:50:44gevaertsI didn't test it at all :)
17:51:07 Join hebz0rl [0] (
17:51:15bertrikdo we have a function to splash a text and wait for confirmation?
17:51:52pamauryI'm not sure but does plugins.c defines [insert here the #define that redirect logf to _logf and not to void)] so you're logf message is not lost ?
17:52:50gevaertshm, good point
17:54:24pamaurythat's #define LOGF_ENABLE
17:54:51kugelbertrik: no, such things are usually done by the yesno screen
17:55:07kugelbut there's a patch of mine on the tracker to implement such a splash
17:56:09gevaertsprinting files is a bit tricky. You can't easily get back at the filename from the fd as far as I can see, and just printing the fd doesn't seem that useful
17:56:45pamauryreally, is it that tricky ?
17:58:08 Join saratoga [0] (i=463f90ed@gateway/web/freenode/x-kishqowqivgnuscg)
17:58:40saratogaanyone know if FS #10887 - "Change poweroff to only check that the power button is pressed" is remotely safe ?
17:58:52gevaertsYou can have the starting cluster if you like
17:59:17pamauryNo really useful
18:00:32 Join MagusG [0] (
18:04:50bertrikjust knowing which plugin is leaking fd's or double-closing fd's is already very useful I think, even if you don't know the exact file name
18:05:14FlynDicefunman's latest dbop patch seems to work just fine on my e280v2
18:09:05kugelFlynDice: didn't you need to fix what I've mentioned in the previous comment?
18:09:34 Quit Kopfgeldjaeger (Read error: 110 (Connection timed out))
18:09:38amiconnUnhelpful: That *is* odd..
18:09:49FlynDicekugel: no, but i didn't really look at that, it built just fine
18:10:17kugelstrange, I haven't compiled myself but it shouldn't compile as I see it
18:14:17***Saving seen data "./dancer.seen"
18:16:21FlynDicekugel: I see delay declared on line 31 and then used on line 51, what do you see? I'ts ifdef'd for fuze only also. The patch complained when I applied it but things seemed to be in order when I checked.
18:18:07kugelthat's not the right patch I think
18:18:17kugelfunman's latest patch doesn't #ifdef for the fuze only
18:18:39FlynDicewell let me go back & check then
18:18:45kugel+#if defined(SANSA_FUZE) || defined(SANSA_E200V2)+ int delay = 50;
18:19:11kugeland there's a 'delay = 50;' before that
18:19:13 Join Zaba [0] (n=zaba@about/goats/billygoat/zaba)
18:19:34Zabahi guys, I know this is a little off-topic, but... I have a creative zen touch around here, and I was wondering, does it have its OS on the HD, or in some ROM?
18:19:59kugelif you know it's off-topic, why do you ask then?
18:20:44Zababecause people here have a chance of knowing, having dealt with various audio players before
18:21:10saratogatry rockbox-community
18:28:44 Join soap_ [50] (n=soap@rockbox/staff/soap)
18:29:29 Quit soap (Nick collision from services.)
18:29:37 Nick soap_ is now known as Soap (n=soap@rockbox/staff/soap)
18:29:42 Nick Soap is now known as soap (n=soap@rockbox/staff/soap)
18:31:06FlynDicekugel: you are correct about the delay being used before it's declared. I must have had some old leftover files. The patch applied cleanly this time and does not build.
18:32:23saratogabut it still doesn't work on the e200v2 anyway?
18:32:49 Quit MagusG (Read error: 60 (Operation timed out))
18:33:12kugelFlynDice: when git complains about existing files, then it doesn't apply the patch for those files
18:33:55 Join froggyman [0] (
18:34:42FlynDiceYes, but they are new files and they were there and looked correct when I checked. They must have been leftover from a previous patch...
18:35:39FlynDicesaratoga: The problem doesn't occur on the e200v2's but the fixes have been breaking the e200v2's while fixing the fuze
18:36:14kugelcan you reproduce mc2739's problems in plugins?
18:37:51FlynDiceno more time right now, I'll try later
18:38:20 Join tomers [0] (
18:39:42 Quit Utchybann ("I like core dumps")
18:46:03Unhelpfulamiconn: is it really? i don't imagine that div == 2^N is a very common case, and it would have to be fairly common to be a real savings. num>1<<31 is also very uncommon, about 1 in a million. for APE i think i'll handle that case with a test and branch to some code that pushes some bits to stack and then calls the "small" division as a function, and fixes up the results. that will minimize the common-case cost of handling large numerators
18:46:03Unhelpful libgcc divider replacement it probably makes a bit more sense to spend a few more cycles to avoid the extra branches and possibly the stack push.
18:51:17amiconnBack when I did this implementation, optimising the 2^n case (from ordinary bit-checking in 2^i steps to the same algorithm used in ffs_arm.S) caused a measurable APE speedup
18:54:46Unhelpfula large one? if the main divider increases in speed then the tradeoff for special-case optimizations changes as well... my benchmarks on the ape normal sample were 82.55, 82.08, 81.82, and 81.32MHz. the first is svn, then with the 2^n test removed, then div==1, then the explicit num<div test
18:55:46amiconnNot a large one, but measurable. Iirc 1.5% or so
18:59:03 Join funman [0] (n=fun@rockbox/developer/funman)
18:59:20Unhelpfulthat's pretty close to what changing the main divider loop got, so if you then improve the speed of that case a bit further still by removing the test, i can see how it would at least be even.
18:59:27 Join flydutch [0] (
19:00:05kugelfunman: are you sure you posted the correct patch? it doesn't seem to build successfully
19:00:44funmanI just read that, building again, I think I moved delay declaration after testing and before making the patch
19:01:41 Quit Highlander (Read error: 104 (Connection reset by peer))
19:05:00funmankugel: just uploaded a new patch with delay before reads increased to 100 nops, can you feel a difference in the scrollwheel ?
19:05:17kugelI'm not able to build right now
19:05:53funmanno hurry, we're not even close to a release :/
19:06:20 Quit hebz0rl ("Ex-Chat")
19:10:26 Join Utchybann [0] (
19:11:30bertrikfunman, I can't test because I don't have an e200v2 or a fuze, but I think the only delay we need is just after waiting for FIFO empty, at least in theory
19:11:32 Join xnyhps [0] (n=xnyhps@2001:470:1f15:da:0:0:0:1000)
19:12:27funmanyou can test on c200v2 ?
19:13:07funmanit seems modification to DBOP_TIMPOL_23 isn't effective immediately
19:13:11kugelthe lcd driver need a little delay after polling for fifo empty as well, IIRC
19:13:14funmanthe delay required might be much shorter though
19:14:15bertrikI realise now that I mixed up DBOP_TIMPOL_23 and DBOP_TIMPOL_01 in my comment on the FS task
19:17:41funmanI understood that, although I'm not sure why c0 & c1 haven't the same configuration
19:19:31 Quit saratoga ("Page closed")
19:22:23 Join Grahack [0] (
19:23:44bertrikfunman, maybe one of those acts as a kind of lcd reset signal?
19:28:37Unhelpfulok, pretty sure i have the right math for taking n and the quotient and remainder from (n>>1/d) and figuring out the quotient and remainder for n/d
19:28:53funmanI added a dbop_read_input() inside lcd_update_rect() to stress test it
19:29:15Unhelpfuldo we really need a special case for d == 0 in udiv_arm? on platform where we just use a C divide that case will throw a div0, so i'm imagining that is also a can't-happen...
19:30:02funmandoesn't divide by 0 need a uint_infinity_t return type ? :)
19:31:03funman10 nops are enough to not see any blue pixels / shifting
19:31:06Unhelpfulfunman: well, the libgcc divider should throw an exception for a divide by zero, and i'm pretty sure that an x/0 should cause a panic with a "divide by zero" message
19:31:08 Quit martian67 (Nick collision from services.)
19:31:09 Join lol2 [0] (
19:31:21 Join martian67 [0] (n=arkfar@about/linux/regular/martian67)
19:31:22 Quit lol2 (Remote closed the connection)
19:31:23 Quit martian67 (Remote closed the connection)
19:32:20Unhelpfulso, if we want to have the arm udiv implementation for APE behave the same as using a C division, we should call the div0 handler. and if faulty decoding instead of a panic is acceptable, we should just divid without checking :)
19:32:58Unhelpfulif it's a condition that can't happen in a valid file then a broken decode is as "valid" as anything else we might do
19:33:04funmanhow much performance we lose with the check?
19:33:09funmanit could help debug decoder
19:34:05 Join faemir [0] (n=faemir@
19:34:22Unhelpfulwell, the thing is that right now the check still returns a value instead of triggering a panic :)
19:34:37Unhelpfulbut true, it's possible that a valid file could cause a div0 due to decoder error
19:36:51kugelfunman: 10 is what the lcd drivers also use I believe
19:37:17kugelI think they have it after configuring DBOP_CTRL too
19:37:22funmandelay = 2 : still no problems
19:38:16kugelUnhelpful: don't we have a div0 handler for arm?
19:39:02Unhelpfulfunman: the test and branch cost two cycles, and ape does three divides per sample. i think i could make it cost one cycle with a small change to the divider... it inverts the divisor, we could set flags on than and beq to the div0 handler.
19:39:13Unhelpfulkugel: we *have* one, but we don't *call* it :)
19:39:38kugelI think I've seen it in a plugin
19:40:02 Join kramer3d [0] (n=kramer@unaffiliated/kramer3d)
19:40:04Unhelpfuland costing a few more cycles right before panicing in a failure case to save one cycle in the working case seems fair :)
19:40:11funmanUnhelpful: if b is conditional there's no extra cycle involved ?
19:40:11 Quit kramer3d (Read error: 54 (Connection reset by peer))
19:40:12 Quit bmbl ("Bye!")
19:41:53 Join StealthyXIIGer [0] (n=stealthy@
19:42:14Unhelpfulfunman: a skipped instruction costs at least 1c
19:43:36pamaurygevaerts: in you're code, I think the double free condition is the reverse: if(!(open_files & (1<<fd)))
19:43:39 Quit amiconn (Nick collision from services.)
19:43:41 Join pixelma_ [0] (i=quassel@rockbox/staff/pixelma)
19:43:41 Quit pixelma (Nick collision from services.)
19:43:41 Join amiconn_ [0] (i=quassel@rockbox/developer/amiconn)
19:43:56 Nick pixelma_ is now known as pixelma (i=quassel@rockbox/staff/pixelma)
19:43:59*Unhelpful is a bit confused... div0 loads r0 from the stack top, #3 to r1, and then calls UIE... so you're supposed to push the address of the fault to the stack before calling it?
19:44:01 Nick amiconn_ is now known as amiconn (i=quassel@rockbox/developer/amiconn)
19:46:09funmanUnhelpful: check what libgcc does
19:47:25Unhelpfulworking on that now
19:48:37mahoneyi've seemed to have lost some uh, loudness in my sansa, i can't figure out if my headphones are starting to die because of sweat or something or if it's a setting on rockbox
19:48:43 Join SolarWar [0] (
19:48:51funman_dvmd_tls.o __div0 is 'bx lr'
19:49:03 Join Zaba_ [0] (n=zaba@about/goats/billygoat/zaba)
19:50:17funmancallers push lr on the stack though
19:50:58funmanso we'd need to substract 4 to the value popped from the stack to get the real fault address
19:51:05Unhelpfulit calls some "cfi_push" in the libgcc arm asm... i can't find a definition?
19:51:58funmanare you checking the source ? i just opened libgcc.a
19:52:04 Join fdinel [0] (
19:52:57bertrikmahoney, I haven't noticed any changes w.r.t. volume on my sansa clip and sansa e200
19:53:26funmanmahoney: try removing the config file
19:54:06Unhelpfulwell, i first looked at what __div0 did in rockbox.elf. then i looked at libgcc source... which is not very enlightening. :/
19:54:38Unhelpfulbut it does look like lr is on stack top when calling __div0, so i need to push it first (since this is an asm leaf function)
19:56:27mahoneyok funman willdo
19:56:42 Quit Grahack ("Tu m'as vu ?")
19:57:04mahoneybertrik: yeah i can't tell if it's the headphones though they seem to die once i start to really perspire at the gym so it makes me think it could be the phones too
20:00:04 Join MagusG [0] (
20:00:22Unhelpfulwe don't seem to apply an offset to lr before calling __div0 anywhere else... but maybe __div0 should apply one?
20:00:24bertrikCan we have genlang generate a comment with the id for each language string in lang_core.c?
20:00:46funmanUnhelpful: i think __div0 should before calling UIE
20:01:55 Quit Zaba (Read error: 110 (Connection timed out))
20:02:24 Join sefe [0] (
20:10:09mc2739funman: still no improvement for me with the latest patch on FS #10603 - maybe we should wait and see if FlynDice can reproduce the same problems I have with his e200v2.
20:11:28gevaertspamaury: oh, right. Can you add a note on the tracker?
20:14:20***Saving seen data "./dancer.seen"
20:14:39Unhelpfulthis looks about right... i haven't added __div0 support to the 31-bit divider body, yet.
20:14:54FlynDicemc2739: funman: I get the same mpegplayer volume phenomenon but haven't checked rockboy/doom(don't have the extra stuff installed...)
20:15:24gevaertspamaury: never mind, I've added one myself
20:18:34 Quit GeekShadow (Read error: 104 (Connection reset by peer))
20:19:00 Quit sefe ("CGI:IRC (EOF)")
20:19:21 Join saratoga [0] (i=9803c6dd@gateway/web/freenode/x-jcdfuasjojppojbz)
20:21:25 Nick fxb__ is now known as fxb (
20:21:47saratogawhat is the bug in mpeg player? seeking?
20:23:48 Join martian67 [0] (n=arkfar@about/linux/regular/martian67)
20:25:15mc2739saratoga: no, it is a scrollwheel problem. With FS #10603 installed, the volume can only be changed while paused. Without the patch, volume can be changed while playing or paused.
20:25:28saratogalet me try that
20:26:07 Quit faemir (Read error: 54 (Connection reset by peer))
20:26:07mc2739with the doom and rockboy plugins, the scollwhell does not function at all
20:26:46Unhelpfulah, it's good to bx lr after after fixing up the result instead of falling through to the div0 handler :D
20:26:58saratogayeah i can't change the volume on mine either
20:27:05saratogaweird that it works so well elsewhere
20:28:18mc2739saratoga: kugel suggested that it may be due to the higher frame rates needed
20:29:08kugelit appears the approach fails if the lcd is very busy
20:29:58mc2739although why would that cause a problem in the menus of doom and rockboy?
20:30:34*Unhelpful would love a hardware interrupt switch or button for when something gets stuck in a loop :/
20:31:06Unhelpfulso that rockbox could panic with a "killed at <address>"
20:31:17 Quit Zaba_ (Remote closed the connection)
20:31:19kugel*cough* watchdog *cough*
20:31:29Unhelpfulkugel: does e200 have one?
20:31:47Unhelpfulright now the watchdog just shuts off when not serviced (on beast)
20:32:17 Join faemir [0] (n=faemir@
20:32:27kugelno idea whether the e200 has one
20:32:30amiconnUnhelpful: div0 behaviour isn't consistent across target architectures iirc
20:33:51Unhelpfulamiconn: well, i can move the test and save 1c in udiv, by changing the rsb \divisor, \divisor\ #0 to rsbs, and following with a beq
20:35:02saratogaUnhelpful: I think PP does have a watchdog
20:35:11Unhelpfulalthough clearly something's going wrong with this version:
20:38:14Unhelpfulfor a general-purpose divider it might make more sense to do the fixup stuff *around* the 31-bit divider, and possibly take a few extra cycles in it to spare a register for the unshifted numerator.
20:39:59 Join fenugrec [0] (
20:40:24saratogathe PP product briefs appear to be gone from the internet
20:46:35Unhelpfulwe certainly don't seem to have code for supporting a PP watchdog (grep watchdog firmware/target)
20:48:16CIA-6New commit by 03Blue_Dude (r24145): xobox: show game stats when finishing level
20:51:21 Quit stoffel (Remote closed the connection)
20:52:31 Nick Llorean1 is now known as Llorean (
20:53:50saratogaUnhelpful: IIRC the AS chip on the PP5024 probably has a watchdog
20:58:41 Join Buschel [0] (
21:00:11saratogaare we branching soon?
21:00:48saratogai kind of want to commit the aac patches, but i won't if we're about to branch since they'll need testing on a wider variety of files then i have
21:02:57kugelwe don't seem to freeze very soon
21:03:16BuschelTorne, don't you think it is time to submit fs#9708 (v9 dma patch + v2 cache alignment patch)? all the other further changes can be evaluated later on...
21:03:39saratogaok then i'm just going to commit them
21:08:39Unhelpful hrm, i can't find any reason this should hang. the disassembly looks exactly like i'd expect. :/
21:10:36 Nick fxb is now known as fxb__ (
21:11:37 Part fenugrec ("Leaving")
21:12:32 Quit gevaerts (Nick collision from services.)
21:12:41 Join gevaerts [0] (n=fg@rockbox/developer/gevaerts)
21:14:49Unhelpfulah, no, there was an error, not in control flow but in result. must've made the decoder go nuts somehow.
21:22:28gibbon_good evening everybody
21:22:57gibbon_i am not very happy to announce that i have to take down one of the rockbox build clients I contributed.
21:24:07gibbon_is there any step besides stopping rbclient to permanently remove the machine from the build servers records?
21:24:27CIA-6New commit by 03Buschel (r24146): Submit FS #10718. Small fix to calculation of estimated runtime to avoid negative results.
21:24:33gevaertsgibbon_: thanks for the time it was running!
21:25:35kugelgibbon_: nothing is needed, just stop it
21:26:00gibbon_gevaerts: i was glad being able contribute that way... its really easy to set up a client and its the best i can do for the project for now
21:26:28gibbon_so ou should basically thank the people who wrote that shiny and very helpful piece of software :)
21:26:33gibbon_kugel: ok, thanks
21:27:22gibbon_i am very sad to stop the machine, since i was watching the nuber of build clients drop in the last weeks ... increasing the average build cycle time to about twice the time, it needed a month or so ago
21:28:01 Join toffe82 [0] (
21:28:02bertrikI'm sure it'll increase again, I guess it dropped because of the holidays
21:28:19gevaertsgibbon_: the build system does keep a full history. If you really want to remove traces, talk to Zagor
21:28:59gibbon_gevaerts: no, thats fine.
21:29:31 Join Barahir_ [0] (
21:30:04gibbon_gevaerts: i just was unsure if some part of the system should be notified if a build client will definately not reappear
21:30:53gevaertsgibbon_: no. It's really designed to handle clients coming and going
21:31:05gibbon_even better.
21:31:15mc2739gibbon_: that is the nice thing about the build system - clients can come and go at will without causing a problem
21:31:52gibbon_i will spawn another, if new colocation hardware is available..
21:32:28gibbon_mc2739: yeah... i have not seen a more usable system than this before... its ... very nice :)
21:33:04 Quit rhodan (No route to host)
21:33:06*kugel hasn't seen a comparable system at all yet :)
21:33:33gibbon_kugel: also correct ;)
21:36:31 Join phanboy4 [0] (n=benji@
21:36:39TorneBuschel: I'm going to submit it after we branch for release.
21:38:47BuschelTorne: fine. This wohle stuff was tested enough via flyspray.
21:39:06Torneit's not been tested at all on many of the targets it affects
21:39:46Buschelwell, then let us call for testers here :o)
21:39:55Tornebut yes, i'm going to put the dma code in, and look at a etter way to align buffers (I don't like the current patch very muc and it doesn't help with all the other uffers in the system which need it)
21:39:59Tornealready have
21:40:04Torneit's tested as much as it's going to be :)
21:40:16Torneso, after the release iw ill commit it and we will get more testers :)
21:42:27 Quit Barahir (Read error: 110 (Connection timed out))
21:45:22Unhelpfulhrm, no way to panic from codec?
21:45:50Unhelpfuli suspect a division error somewhere is causing the decoder to go wrong. it would be nice if it could just spit out the bad values. :/
21:52:30 Quit Zarggg ()
21:54:59CIA-6New commit by 03saratoga (r24147): Commit first part of FS #10832 by Juliusz Chroboczek. Allows playback of unstreamable AAC/ALAC files by stepping through the file to find the index, ...
21:59:44 Quit Utchybann (Read error: 113 (No route to host))
22:02:15CIA-6New commit by 03saratoga (r24148): Second part of FS #10832 by Juliusz Chroboczek. Ignore empty mdat chunks in mp4 files.
22:02:15 Quit domonoky (Read error: 104 (Connection reset by peer))
22:05:01 Join domonoky [0] (n=Domonoky@rockbox/developer/domonoky)
22:14:24***Saving seen data "./dancer.seen"
22:16:37 Quit phanboy4 ("Leaving")
22:38:47 Quit dfkt ("-= SysReset 2.53=- Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.")
22:41:43pamaurygevaerts: I test your FS #10889 patch and it works (I also add a ENABLE_LOGF #define). The remaining point is how the error is reported: logf only ? splash ? panic ? destroy device ? :)
22:43:20gevaertspamaury: I'm not sure. panic seems a bit harsh, although it provides the most information (you can use the .elf file to find out where exactly it went wrong)
22:43:58pamauryI feel panic is a bit hard but perhaps splash or a screen to inform the user
22:45:04gevaertsmaybe. It will confuse a lot of people though
22:46:22pamauryPerhaps go in a screen, display "Rockbox detected the plugins "...." has a problem and need to be fix. Report this bug to Rockbox team (error: plugin leak file handles)". And wait for the user to acknowledge
22:47:06pamauryIt could be annoying if the plugin is leaking file each time it is launch but normally it's not the case
22:47:38gevaertsit shouldn't, true
22:47:46bertrikpamaury, if it is leaking every time, it *should* be annoying and fixed quickly IMO
22:48:42 Quit StealthyXIIGer (Read error: 110 (Connection timed out))
22:49:00pamauryI don't exactly now how screens work in Rockbox but it feel a whole screen is better than a splash message that will probably be ignore
22:49:31 Join FOAD_ [0] (
22:50:41 Quit FOAD (Read error: 60 (Operation timed out))
22:50:41 Nick FOAD_ is now known as FOAD (
22:55:03 Quit tomers ("ChatZilla 0.9.86 [Firefox 3.5.6/20091215231400]")
22:56:48 Quit Buschel ()
22:59:40 Join DerPapst1 [0] (
23:04:43pamaurygevaerts: is there a kind of screen like yesno but without choice ? Just a fullscreen with a message ? Perhaps you're not the one to ask ! I feel splash if too small
23:05:01gevaertsI'm not the one to ask indeed. I have no idea :)
23:05:50pamauryDoes anymore know ?
23:06:03*pamaury is tired
23:15:57 Quit DerPapst (Read error: 110 (Connection timed out))
23:22:31 Quit S_a_i_n_t ("[St.] S_a_i_n_t")
23:23:00 Join S_a_i_n_t [0] (i=Saint@
23:25:42 Join Utchybann [0] (
23:33:21 Join Mouser_X [0] (
23:34:07 Quit Mouser_X (Client Quit)
23:34:07bertrikthere seem to be a lot of little things wrong with the chip8 plugin
23:35:10 Join JdGordon1 [0] (
23:37:49 Quit Barahir_ (Read error: 110 (Connection timed out))
23:46:41 Join merbanan [0] (
23:47:04 Quit pamaury ("exit(*(int *)0 / 0);")
23:49:29 Join jamer [0] (
23:49:50 Nick jamer is now known as jamer123 (
23:50:33 Quit jamer123 (Client Quit)
23:51:31CIA-6New commit by 03bertrik (r24149): Fix tabs in chip8 plugin
23:51:57 Join jamer123 [0] (
23:52:21 Quit S_a_i_n_t ("[St.] S_a_i_n_t")
23:52:57jamer123can anyone help me?
23:53:29bertrikyes probably, just ask your question
23:53:52saratogawhat a wonderfully existential question
23:54:34 Quit jamer123 (Client Quit)
23:54:42 Join jamer123 [0] (
23:56:32jamer123well i wanna ask if your firmware can be used on a gigaware video media player
23:57:38saratogatheres a list of supported players on the front page
23:57:43jamer123well i want to ask if my mp3 player ( a gigaware video media can use your firmware
23:57:52jamer123well i want to ask if my mp3 player ( a gigaware video media can use your firmware
23:58:01bertrikthe answer is no
23:58:15jamer123not said there
23:58:28bertrikrockbox runs on toshiba gigabeat F and X, but not on gigaware players
23:58:38jamer123sorry theres lag

Previous day | Next day