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Re: [Qemu-devel] 0.9.0 and svn don't build with -march=pentium2 etc.; w

From: Sunil Amitkumar Janki
Subject: Re: [Qemu-devel] 0.9.0 and svn don't build with -march=pentium2 etc.; was: Latest SVN fails to build on Fedora Core 6 (same with 0.9.0)
Date: Thu, 22 Mar 2007 21:13:00 +0100
User-agent: Thunderbird (X11/20070221)

Thomas Orgis wrote:
Am Sun, 18 Mar 2007 09:18:40 +0000
schrieb Nigel Horne <address@hidden>:
The first part is true, the second is not, in that I already upgraded
to the 686 kernel, so the qemu build on FC6 is not fixed by installing the 686 

So, do we have any other clue about this?
Some qemu coder knows anything about this error?

/opt/gcc34/bin/gcc -march=pentium2 -Wall -O2 -g -fno-strict-aliasing
-fomit-frame-pointer -I. -I.. -I/usr/src/qemu-0.9.0/target-i386
-I/usr/src/qemu-0.9.0 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -I/usr/src/qemu-0.9.0/fpu -DHAS_AUDIO
-I/usr/src/qemu-0.9.0/slirp  -c -o
helper.o /usr/src/qemu-0.9.0/target-i386/helper.c ../softmmu_template.h:
In function `__stq_mmu': ../softmmu_template.h:260: error: unable to
find a register to spill in class
`GENERAL_REGS' ../softmmu_template.h:260: error: this is the insn:
(insn:HI 365 364 366 13 ../softmmu_template.h:290 (parallel [ (set
(reg:DI 0 ax [216]) (lshiftrt:DI (reg/v:DI 59 [ val ]) (subreg:QI
(reg:SI 0 ax [215]) 0))) (clobber (scratch:SI)) (clobber (reg:CC 17
flags)) ]) 309 {lshrdi3_1} (insn_list 364 (nil)) (expr_list:REG_DEAD
(reg:SI 0 ax [215]) (expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_UNUSED (scratch:SI) (nil)))))
../softmmu_template.h:260: confused by earlier errors, bailing out

It is really persistent with any pentium/athlon march setting above
pentium-mmx and alone with the -msse flag.
If the answer is "Do Not Use GCC Arch Setting" then it would be nice to
have it spelled out by someone else than me... of course I'd prefer
this thing to work;-)


Qemu-devel mailing list

I have seen this error as well when building with i686/pentium3/athlon
optimisations. As I am doing a course on x86 assembly programming
at the moment I can tell you that it suffers from register starvation
and the message tells you that there aren't enough registers left.

That's why I build QEMU on x86 with "-O2 -march=i486 -mtune=i686".

I am not a QEMU developer (yet!) but I am using it at the moment to
emulate SPARC, ARM and MIPS(EL) to build Linux executables natively
in (Slackware) Linux distributions for those architectures.

I hope to start contributing to PPC and Alpha emulation when I understand
more about QEMU's internal architecture.

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