398093 – sys-devel/gcc-4.6.2 with -march=bdver1 creates broken media-libs/jpeg

Bug 398093 - sys-devel/gcc-4.6.2 with -march=bdver1 creates broken media-libs/jpeg

Summary: sys-devel/gcc-4.6.2 with -march=bdver1 creates broken media-libs/jpeg

Status:	RESOLVED TEST-REQUEST

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	[OLD] Development (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Gentoo Graphics Project

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:

Reported:	2012-01-07 23:00 UTC by Jonathan Isom
Modified:	2013-04-23 06:15 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

Attachments
emerge --info (emerge_info,16.48 KB, text/plain) 2012-01-07 23:00 UTC, Jonathan Isom	Details
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Description Jonathan Isom 2012-01-07 23:00:40 UTC

Created attachment 298275 [details]
emerge --info

gcc-4.6.1-r1 and gcc-4.6.2 both with --march=bdver1 creates media-libs/jpeg that corrupts input jpegs and can't save jpegs.  Tested with gimp, firefox, konqueror, and media-gfx/imagemagick(convert input.png output.jpg).  tested with jpeg 7 and 8.


# convert input.png output.jpg
convert: DCT coefficient out of range `Untitled.jpg' @ error/jpeg.c/JPEGErrorHandler/297.

Comment 1 Jonathan Isom 2012-01-18 23:54:21 UTC

this appears to be related to <https://bugs.gentoo.org/show_bug.cgi?id=399251>.  If I set my CFLAGS="-O3 -march=bdver1 -mno-sse4.1 -mno-avx" I get no problem.

Comment 2 Jonathan Isom 2012-04-27 15:47:47 UTC

This appears to be corrected in gcc 4.7.0. I used a modified ebuild from the toolchain overlay for gcc.

Comment 3 Ryan Hill (RETIRED) gentoo-dev

2013-04-23 06:15:19 UTC

You can try 4.6.4, but if that doesn't work then use 4.7.  The 4.6 branch is closed upstream so without a specific patch we can't do much about it.