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Ruairi
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 Posted: Fri Aug 16, 2002 7:52 pm Post subject: gcc 3.2-pre -march=pentium4 -msse2 |
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If I try to compile mozilla or X-4.2 with the above optimizations I get errors complaining about movd operands being incorrect... Any ideas ???
Ruairi |
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rac
Bodhisattva
Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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| Posted: Fri Aug 16, 2002 8:13 pm Post subject: |
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From Installing Gentoo to GCC3, because it involves a gcc 3.x problem with something after completion of the install guide.
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Locke
n00b
Joined: 02 Aug 2002
Posts: 50
Location: Baton Rouge, LA, US
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| Posted: Fri Aug 16, 2002 9:06 pm Post subject: |
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GCC 3.1.1-r1 has trouble compiling a few packages with -msse2 because certain ebuilds (XFree for example) knock my -march= setting down from pentium4 to pentium3, thus the invalid asm instructions. Why is this?
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rac
Bodhisattva
Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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| Posted: Fri Aug 16, 2002 9:16 pm Post subject: |
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| Locke wrote: | | GCC 3.1.1-r1 has trouble compiling a few packages with -msse2 because certain ebuilds (XFree for example) knock my -march= setting down from pentium4 to pentium3, thus the invalid asm instructions. Why is this? |
There were bugs with pentium4 optimizations in GCC 3.1. IIRC, the original reason there was an ebuild of a prerelease of 3.1.1 was because the ebuild author had a P4 and was hacked off. I am guessing that the xfree ebuild tried to work around the P4 problems, and maybe didn't distinguish between 3.1 and 3.1.1. Which xfree ebuild version are you working on?
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Locke
n00b
Joined: 02 Aug 2002
Posts: 50
Location: Baton Rouge, LA, US
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| Posted: Fri Aug 16, 2002 9:35 pm Post subject: |
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4.2.0-r12. That does make a bit of sense. Thanks for the info 
_________________
---BEGIN GEEK CODE BLOCK---
GH/MU d+ s+:+>+: a--- C++ UL+++>++++ P>++ L+++(++) E- W++(-) N+ o?
K+ w !O M-- !V PS+@ PE Y+ PGP t 5 X- R-@ tv- b+++ DI+ D G e>++++ h- r y
---END GEEK CODE BLOCK--- |
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rac
Bodhisattva
Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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| Posted: Fri Aug 16, 2002 10:01 pm Post subject: |
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OK, that's the version I was looking at. I think this is the culprit: | Code: | if [ "`gcc -dumpversion`" != "2.95.3" ]
then
# should fix bug #4189. gcc-3.x have problems with -march=pentium4
echo "#define OptimizedCDebugFlags ${CFLAGS/pentium4/pentium4 -mno-mmx} -fno-merge-constants" >> \
config/cf/host.def
else
echo "#define OptimizedCDebugFlags ${CFLAGS}" >> config/cf/host.def
fi |
You could try modifying your copy of the ebuild to make the test always fail by replacing the "if' line with something like:
...and see if it does what you want it to do.
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Ard Righ
Guru
Joined: 24 Jun 2002
Posts: 337
Location: Wellington, NZ
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| Posted: Sun Aug 18, 2002 8:27 am Post subject: |
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| Hmm, I just emerged Gnome on a new 1.4/3.2 system using -march=pentium4 -mmmx -msse -msse2 -mfpmath=sse -O3 -pipe and I didn't get any errors at all. |
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