[Qemu-devel] [PATCH] x86_64 Linux gcc4 support

[Alexander Graf]

Hi,

by mere accident I fixed the gcc4 Linux x86_64 support. Originally I  
was tracking down a bug in the Mac OS version and wanted to compare  
the outputs of the Linux version with the Mac one when I realized that  
a gcc4 compiled qemu does not work on x86_64 Linux.
The symptoms were very similar to those I saw on Darwin though (TB  
jumping), so I transferred the MACH-O / Apple patch to ELF / Linux and  
it just worked. Basically this enables USE_DIRECt_JUMP for x86_64. I  
have no clue why the "default case" breaks, but DIRECT_JUMP is faster  
anyway, so I don't really care.

Tested with openSUSE 10.3 (gcc 4.3) and x86_64-softmmu.

If this patch breaks any other platform that works with x86_64, please  
say so and exclude that one from the #ifdef or implement __op_jmp in  
dyngen.
Nevertheless this should give a nice speedup for x86_64 hosts and  
enables recent gcc4-only (-march) optimizer flags.

Cheers,

Alex

qemu-x86_64-gcc4.patch
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