On Fri, Jul 03, 2020 at 02:00:02PM +0200, Lynne wrote: > Maybe they've fixed the FATE failures. >
> configure | 1 - > 1 file changed, 1 deletion(-) > b22153ad0a33560a4fb549b227efabeec0952542 > 0001-configure-reenable-tree-vectorization-for-GCC.patch > From 70b1f1e9af83ff855fc4633d2f95eab7eb0173e1 Mon Sep 17 00:00:00 2001 > From: Lynne <[email protected]> > Date: Fri, 3 Jul 2020 12:51:27 +0100 > Subject: [PATCH] configure: reenable tree vectorization for GCC > > Its been years, maybe they've fixed the FATE failures. > --- > configure | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/configure b/configure > index bdfd731602..cf4ea6ea48 100755 > --- a/configure > +++ b/configure > @@ -6908,7 +6908,6 @@ if enabled icc; then > disable aligned_stack > fi > elif enabled gcc; then > - check_optflags -fno-tree-vectorize > check_cflags -Werror=format-security > check_cflags -Werror=implicit-function-declaration > check_cflags -Werror=missing-prototypes > -- > 2.27.0.353.gb9a2d1a020 > Breaks with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04) [First and only version tested] did not investigate if the affected code is free of UB or what is exactly happening, just reporting that theres a segfault ... ./ffmpeg -i mm-short.mpg -pix_fmt yuv420p16be -vframes 1 file-yuv420p16be.pgmyuv ./ffmpeg -y -i file-yuv420p16be.pgmyuv -bitexact file-yuv420p16be.bmp ... Input #0, pgmyuv_pipe, from 'file-yuv420p16be.pgmyuv': Duration: N/A, bitrate: N/A Stream #0:0: Video: pgmyuv, yuv420p16le, 720x576, 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (pgmyuv (native) -> bmp (native)) Press [q] to stop, [?] for help Program received signal SIGSEGV, Segmentation fault. pnm_decode_frame (avctx=<optimized out>, data=0x555557b936c0, got_frame=0x7fffffffd590, avpkt=<optimized out>) at libavcodec/pnmdec.c:230 230 v = av_be2ne16(((uint16_t *)s->bytestream)[j]); (gdb) bt #0 0x000055555601d210 in pnm_decode_frame (avctx=<optimized out>, data=0x555557b936c0, got_frame=0x7fffffffd590, avpkt=<optimized out>) at libavcodec/pnmdec.c:230 #1 0x0000555555c4cdb7 in decode_simple_internal (frame=0x555557b936c0, avctx=0x555557b85e80) at libavcodec/decode.c:342 #2 0x0000555555c4cdb7 in decode_simple_receive_frame (frame=<optimized out>, avctx=<optimized out>) at libavcodec/decode.c:538 #3 0x0000555555c4cdb7 in decode_receive_frame_internal (avctx=avctx@entry=0x555557b85e80, frame=0x555557b936c0) at libavcodec/decode.c:556 #4 0x0000555555c4d868 in avcodec_send_packet (avctx=0x555557b85e80, avpkt=0x7fffffffd640) at libavcodec/decode.c:614 #5 0x000055555573eb2b in decode (pkt=0x7fffffffd640, got_frame=0x7fffffffd780, frame=<optimized out>, avctx=0x555557b85e80) at fftools/ffmpeg.c:2217 #6 0x000055555573eb2b in decode_video (ist=0x555557b85cc0, pkt=<optimized out>, got_output=0x7fffffffd780, duration_pts=0x7fffffffd788, eof=0, decode_failed=0x7fffffffd784) at fftools/ffmpeg.c:2359 #7 0x000055555573f85c in process_input_packet (ist=0x555557b85cc0, pkt=0x7fffffffd970, no_eof=0) at fftools/ffmpeg.c:2600 #8 0x0000555555742250 in process_input (file_index=<optimized out>) at fftools/ffmpeg.c:4491 #9 0x0000555555742250 in transcode_step () at fftools/ffmpeg.c:4611 #10 0x0000555555742250 in transcode () at fftools/ffmpeg.c:4665 #11 0x000055555571bd8c in main (argc=<optimized out>, argv=<optimized out>) at fftools/ffmpeg.c:4870 (gdb) disassemble $rip-32, $rip+32 Dump of assembler code from 0x55555601d1f0 to 0x55555601d230: 0x000055555601d1f0 <pnm_decode_frame+2640>: (bad) 0x000055555601d1f1 <pnm_decode_frame+2641>: xor %edx,%edx 0x000055555601d1f3 <pnm_decode_frame+2643>: xor %edi,%edi 0x000055555601d1f5 <pnm_decode_frame+2645>: sub %ecx,%r14d 0x000055555601d1f8 <pnm_decode_frame+2648>: add %rcx,%rcx 0x000055555601d1fb <pnm_decode_frame+2651>: lea (%rsi,%rcx,1),%r11 0x000055555601d1ff <pnm_decode_frame+2655>: mov %r14d,%r12d 0x000055555601d202 <pnm_decode_frame+2658>: add %r8,%rcx 0x000055555601d205 <pnm_decode_frame+2661>: shr $0x3,%r12d 0x000055555601d209 <pnm_decode_frame+2665>: nopl 0x0(%rax) => 0x000055555601d210 <pnm_decode_frame+2672>: movdqa (%r11,%rdx,1),%xmm0 0x000055555601d216 <pnm_decode_frame+2678>: add $0x1,%edi 0x000055555601d219 <pnm_decode_frame+2681>: movdqa %xmm0,%xmm2 0x000055555601d21d <pnm_decode_frame+2685>: movdqa %xmm0,%xmm1 0x000055555601d221 <pnm_decode_frame+2689>: punpcklwd %xmm3,%xmm2 0x000055555601d225 <pnm_decode_frame+2693>: punpckhwd %xmm3,%xmm1 0x000055555601d229 <pnm_decode_frame+2697>: pslld $0x8,%xmm2 0x000055555601d22e <pnm_decode_frame+2702>: pslld $0x8,%xmm1 End of assembler dump. [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Freedom in capitalist society always remains about the same as it was in ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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