Hi,
Debian Bug Tracking System wrote:
Hi,
gcc-4.0 need -mmmx, -msee, ... flags in order to compil optimized
assembler. But this break runtime decision of the optimisation according
to the cpu capcibility : you can't mix in the same file generic code, and
runtime selected code.
Attached an example where -mmmx is needed.
so where is the bug? please split the code into two files, or compile
the code two times depending on a preprocessor define into two object
files/libraries.
There no bug if you split the code in 2 file as you can compile the
generic code without -mmmx.
The problem occur when using inline asm code.
The problem is that according gcc manual, with -mmmx, gcc could optimize
the code with mmx instruction. So with the mmx flag the generic code is
no more generic and won't work on no-mmx machine :(
I can't find a generic code that use mmx instruction with mmx flag, so I
can't provide a real example.
IIRC there is a discution about that in gcc ML or bugzilla.
regards,
Matthieu
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