Control: reassign -1 gcc-7 7.1.0-13 Control: severity -1 important Control: retitle -1 gcc-7: ppc64el: miscompiles ffmpeg's scalarproduct_int16_vsx at -O1 Control: forwarded -1 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81833 Control: affects -1 src:ffmpeg
Hi, On 09/08/17 06:47, Adrian Bunk wrote: > Source: ffmpeg > Version: 7:3.3.3-2 > Severity: serious > > https://buildd.debian.org/status/fetch.php?pkg=ffmpeg&arch=ppc64el&ver=7%3A3.3.3-2&stamp=1502249633&raw=0 [...] > TEST checkasm-audiodsp > /<<PKGBUILDDIR>>/tests/fate-run.sh fate-checkasm-audiodsp "" "" > "/<<PKGBUILDDIR>>/debian/standard" 'run tests/checkasm/checkasm > --test=audiodsp' '' '/dev/null' '' '1' '' '' '' '' '' '' '' '' > /<<PKGBUILDDIR>>/debian/standard/ffmpeg -nostdin -nostats -cpuflags all > -threads 1 -idct simple -flags +bitexact -sws_flags +accurate_rnd+bitexact > -fflags +bitexact -f image2 -vcodec pgmyuv -hwaccel none -threads 1 > -thread_type frame+slice -i > /<<PKGBUILDDIR>>/debian/standard/tests/vsynth1/%02d.pgm -flags +bitexact > -sws_flags +accurate_rnd+bitexact -fflags +bitexact -threads 1 -idct simple > -dct fastint -vf format=gbrp14be,vflip= -vcodec rawvideo -frames:v 5 -pix_fmt > gbrp14be -frames:v 1 -f nut md5: > /<<PKGBUILDDIR>>/debian/standard/tests/checkasm/checkasm --test=audiodsp > Test checkasm-audiodsp failed. Look at tests/data/fate/checkasm-audiodsp.err > for details. > checkasm: using random seed 3484844225 > ALTIVEC: > audiodsp.scalarproduct_int16_altivec (audiodsp.c:81) > - audiodsp.audiodsp [FAILED] > VSX: > audiodsp.scalarproduct_int16_vsx (audiodsp.c:81) > - audiodsp.audiodsp [FAILED] > checkasm: 2 of 2 tests have failed > /<<PKGBUILDDIR>>/tests/Makefile:219: recipe for target > 'fate-checkasm-audiodsp' failed > make[2]: *** [fate-checkasm-audiodsp] Error 1 I've debugged this a bit and it definitely looks like GCC 7 has miscompiled some of the VSX routines in FFmpeg. I've filed an upstream bug againt GCC, but I'll probably just disable these optimizations on ppc64el until it's fixed. Thanks, James
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