Bug 104674 – mmx, mmx2, sse, sse2, 3dnow, 3dnowext not unmasked for amd64

• Product: Gentoo Linux
• Status: RESOLVED INVALID

[Description Mark Warren 2005-09-02 22:39:00 UTC]

The mmx, mmx2, sse, sse2, 3dnow and 3dnowext flags are masked in
/usr/portage/profiles/default-linux/use.mask, but never unmasked in amd64
profiles even though the processor supports the instruction sets.

I have unmasked the flags manually and have used the 3dnow, sse and mmx for
xorg-x11 and rss-glx with no problems so far.  And since unmasking them doesn't
enable them by default, it would seem to be fairly safe.

Reproducible: Always
Steps to Reproduce:
1. egrep '(mmx|sse|3dnow)' /usr/portage/profiles/default-linux/amd64/use.mask
2. egrep '(mmx|sse|3dnow)' /usr/portage/profiles/default-linux/amd64/2005.1/use.mask
Actual Results:  
null0 ~ # egrep '(mmx|sse|3dnow)' /usr/portage/profiles/default-linux/amd64/use.mask
null0 ~ # egrep '(mmx|sse|3dnow)'
/usr/portage/profiles/default-linux/amd64/2005.1/use.mask
null0 ~ # 

Expected Results:  
use.mask for amd64 profiles should include:

-mmx
-mmx2
-sse
-sse2
-3dnow
-3dnowext

null0 ~ # emerge info
Portage 2.0.51.22-r2 (default-linux/amd64/2005.1, gcc-3.4.4, glibc-2.3.5-r1,
2.6.12-gentoo-r9 x86_64)
=================================================================
System uname: 2.6.12-gentoo-r9 x86_64 AMD Athlon(tm) 64 Processor 3200+
Gentoo Base System version 1.6.13
dev-lang/python:     2.3.5
sys-apps/sandbox:    1.2.12
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6
sys-devel/binutils:  2.15.92.0.2-r10
sys-devel/libtool:   1.5.18-r1
virtual/os-headers:  2.6.11-r2
ACCEPT_KEYWORDS="amd64"
AUTOCLEAN="yes"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=k8 -O3 -pipe -ffast-math -fpeel-loops -ftracer   -funswitch-loops
-funit-at-a-time"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-march=k8 -O3 -pipe -ffast-math -fpeel-loops -ftracer        
-funswitch-loops -funit-at-a-time"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks sandbox sfperms strict"
GENTOO_MIRRORS="http://gentoo.osuosl.org/"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X acl alsa amd64 avi bash-completion berkdb bitmap-fonts bzip2 crypt dri
eds encode esd fam foomaticdb fortran gif gstreamer gtk gtk2 imagemagick imlib
java jpeg lm_sensors lzw lzw-tiff mp3 mpeg ncurses nls opengl pam pcre pdflib
perl png python qt quicktime readline sdl spell ssl tiff truetype truetype-fonts
type1-fonts usb userlocales xinerama xml2 xpm xv zlib userland_GNU kernel_linux
elibc_glibc"
Unset:  ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS, MAKEOPTS, PORTDIR_OVERLAY

[Comment 1 Simon Stelling (RETIRED) 2005-09-04 04:50:36 UTC]

the use flags are enabling x86 assembler optimizations, therefore they're
masked. however, assembler optimizations are hard-enabled on amd64, since all
cpus support the same flags and there's no good reason for disabling them