similar to: PATCH: OS SSE support detection for GCC on Windows

This patch tries to simplify the code that tries to detect whether OS supports SSE instructions. a) Linux: "old" vs "new" sigaction OBSOLETE_SIGCONTEXT_FLAVOR was disabled in Mar 2007 in commit <http://git.xiph.org/?p=flac.git;a=commit;h=1ca3a445f832be5e8a99364fb38d9e2ea9a3a772> According to <http://unixhelp.ed.ac.uk/CGI/man-cgi?sigaction>: "Support for

More specifically, about this patch: http://git.xiph.org/?p=flac.git;a=commitdiff;h=70b078cfd5f9d4b0692c33f018cac3c652b14f90 I downloaded the latest code from git (flac-70b078c), disabled all SSE optimizations in the code and compiled it (GCC 4.8.2). This patch doesn't change FLAC output. Either gcc is too smart and optimizes this new code back to the old, or this fix is MSVS-specific. Or

Erik de Castro Lopo wrote: >> About part 1:does it have any problems? I can split it into several patches >> (1 fix = 1 patch) or explain the changes in it in detail. > > I didn't apply patch1 because I mis-read your comment here: > > http://lists.xiph.org/pipermail/flac-dev/2014-March/004582.html > > So, for the patches in this email: > >

Hi Guys, I know that FLAC format is currently limited to 8 channels but I was wondering if this hard limitation of the format or if it can be easily circumvented if the flac library is compiled with other settings and/or the software using it don't mind it Thanks ! -- Olivier Tristan Research & Development www.uvi.net

op 11-03-14 15:57, Olivier Tristan schreef: > I may say something stupid but is this helpful ? > http://stackoverflow.com/questions/6121792/how-to-check-if-a-cpu-supports-the-sse3-instruction-set That question on stackoverflow is about CPU support, the patch you replied to was about OS support. Because of the registers used (which must be saved and restored on a context switch), the

I see :( That what I would call a good struct size optimisation. Please tell me there was another reason behind this being only 3 instead of 8 or 16 bits, right ? 2017-01-25 18:30 GMT+01:00 Tor-Einar Jarnbjo <tor-einar at jarnbjo.name>: > Hello Olivier, > > the limitation is in the file format itself, as the number of channels is > encoded in a 3 bit field in the streaminfo

Op 03-12-14 om 16:48 schreef Olivier Tristan: > Looks like I've missed the talk about this regression introduced in 1.3.1.

This patch removes FLAC__lpc_restore_signal_16_intrin_sse2(). It's faster than C code, but not faster than MMX-accelerated ASM functions. It's also slower than the new SSE4.1 functions that were added by the previous patch. So this function wasn't very useful before, and now it's even less useful. I don't see a reason to keep it. -------------- next part -------------- A

Don't overlook the FLAC in Ogg container solution. That's established as a standard for some time now, as far as I know, and would probably be better than a new, proprietary multi mono bundle. I haven't used it myself, but people have been talking about it for a while, and I believe that some "FLAC" users are actually working with FLAC in Ogg container files. Brian

Does anyone have any LLVM IR examples implementing things using the instructions for SSE, like complex arithmetic or 3D vector-matrix stuff? I'd like to have HLVM use them "under the hood" for some things but I cannot see all of the operations that I was expecting (e.g. dot product) and am not sure what works when (e.g. "Not all targets support all types however."). --

Hi Guys, The current trunk do not build with GCC 4.2 on OSX when compiling cpu.c <cpuid.h> does not exists and __get_cpuid() is not defined This version of GCC is required if you want to support pre 10.7 systems which are still pretty common. It seems other project had the same issue https://bugzilla.mozilla.org/show_bug.cgi?id=836824 Don't know much what would be the right fix.

Hi Guys, In stream_decoder.c when assigning lpc restore function, only IA32 processor benefits from SS2 and SSE4.1 optimization. Shouldn't it be the case for x86_64 processor as well ? Thanks, -- Olivier TRISTAN uvi.net -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/flac-dev/attachments/20140311/1d49b5c2/attachment.htm

Hi Guys, I've just faced a wrong warning trying to encode a 24 bits WAV file if(wFormatTag == 1) { if(bps != 8 && bps != 16) { if(bps == 24 || bps == 32) { /* let these slide with a warning since they're unambiguous */ flac__utils_printf(stderr, 1, "%s: WARNING: legacy WAVE file has

Hi Guys, Does having multiple apodization functions change something to the decoding process or does it only apply to the encoding process ? I have been able to gain almost 10% by using several apodization functions (it takes way more time to encode but this is quite a non issue in my use case) but I don't want to sacrifice any decoding speed as this is the bottleneck for me. Thanks,

Hi Guys, The following code in CPU.c (line 155) won't link if you don't have NASM code built even if FLAC__HAS_X86INTRIN is true as FLAC__cpu_info_asm_ia32 don't exists and the else is compiled if there is no dead code stripping if (FLAC__HAS_X86INTRIN) { FLAC__cpu_info_x86(0, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx); info->ia32.intel =

Federico Miyara wrote: ... > The file format allows some unused fields for future use, such as the > padding block. It could include a flag to indicate a change in the > format adding one more streaminfo byte which would allow up to 256 > channels (actually, 256 + 8), or it could trigger a new byte when 11111111. > > There is also an invalid block identifier (127) which could be

Erik de Castro Lopo wrote: >> part 1: fixes >> >> part 2: new code >> >> Any comments? > > Applied cpu_part2.patch. Thanks! Thanks. I hope that this code will help to avoid "bug" reports such as http://sourceforge.net/p/flac/bugs/409/ (it seems that the author of this report compiled FLAC without --enable-sse option). OTOH, SSE support is

Hi! I try to add more functionality to Win64 exception handling, based on the posted patches from Charles Davis and João Matos. But I have a question about how to map SEH handling to LLVM IR. The basic structure of SEH in C is as follows: __try { // Do something. } __except (filter(GetExceptionCode(), GetExceptionInformation())) { // Handle exception } How to

Is LLVM expressive enough to represent asynchronous exceptions? --------------------------------------------------------------- Summary: Need new LLVM instructions or extending of all instructions. C++ exceptions are synchronous: the compiler knows when/where they are being raised. Asynchronous exceptions can be raised at any time. For example, an integer divide-by-zero may raise an

Op 03-12-14 om 15:49 schreef Olivier Tristan: > [...] > If you want to check this on a single piano note, I would be > happy to know if this improves the monophonic use case as well. This sample is indeed a case where the retuning of FLAC 1.3.1 shows a severe regression. It seems the patch does work quite well in this case, but it does not fully fix the regression. FLAC 1.3.0 -5: