26463 2003-08-11 23:50 0000 -march=pentium4 causes hissing/white noise in OGG audio playback 2003-08-16 08:34:13 0000 1 1 1 Unclassified Gentoo Linux GCC Porting unspecified x86 Linux RESOLVED FIXED P2 minor Future 1 hypnos75@gmail.com sound@gentoo.org hypnos75@gmail.com 2003-08-11 23:50:19 0000 I recently upgraded to GCC3 (3.2.3), and rebuilt libvorbis in the process, going from ebuild 1.0-r2 to 1.0-r3. The latter does not filter out "-march=*" flags, and this caused a problem with rock music, which has some jarring higher frequency sounds like cymbal crashes and electric guitar harmonics. So I changed my CFLAGS from "-march=pentium4 -Os -pipe" to "-mcpu=i686 -Os -pipe" and now my OGG tracks sound nominal. My recommendation is to retain the "-march=*" filter in the libvorbis ebuilds. Reproducible: Always Steps to Reproduce: 1. (see "Details") azarah@gentoo.org 2003-08-12 06:48:59 0000 Whoever does libvorbis please. jje@gentoo.org 2003-08-15 23:39:01 0000 Can you retest with -r4. If it is still an issue we can filter pentium4 out. hypnos75@gmail.com 2003-08-16 02:50:14 0000 There is some improvement, but still not acceptable. Going from "-march=pentium4" to "-march=pentium3" doesn't help; "-mcpu=*" is works fine, as before. This Forums thread suggests that "-march=*" is untenable for AMD architectures as well: http://forums.gentoo.org/viewtopic.php?t=73292&highlight=libvorbis jje@gentoo.org 2003-08-16 03:37:29 0000 Understood. I'll add something to filter march in r4. Thanks. jje@gentoo.org 2003-08-16 04:38:34 0000 Now filtering -march=pentium?. Let me know if this works. I'm not convinced that the athlon-zp problem is the same. Reading into the forum post i'd guess that -sse +3dnow results in the simd patch not being applied and consequently everything being okay. If this is the case then perhaps the patch could be applied if (sse || 3dnow), but i have no idea if that will result in any improvement on althon-xp. Anyway, that bug will wait for another day; i don't have an athlon box to experiment with. hypnos75@gmail.com 2003-08-16 04:54:36 0000 Where are you filtering? I'm not seeing any changes after "emerge rsync" nor through the CVS browser on Gentoo.org. Anyway, I'm hitting the sack soon -- let me know when you commit the changes, and I'll try out the ebuild to make sure it works. hypnos75@gmail.com 2003-08-16 08:34:13 0000 Revised -r4 has propagated, and works fine.