commit 0197cd2e350a7151080e7335577e956f1f84a8cb
author Kumar Gala <galak@kernel.crashing.org> Thu Oct 18 16:53:19 2007 -0500
committer Kumar Gala <galak@kernel.crashing.org> Fri Nov 09 03:47:29 2007 -0600
tree 4ac1a37fbb9a8b8ec6c98f3d692bcd18c8b439b2
parent 688016f4e2028e3c2c27e959ad001536e10ee2c5

[POWERPC] Add -mno-spe for ARCH=powerpc builds

Newer GCC's are capable of autovectorization for ISA extensions like
AltiVec and SPE.  If we happen to build with one of those compilers we
will get SPE instructions in random kernel code.  Today we only allow
basic interger code in the kernel and FP, AltiVec, or SPE in special
explicit locations that have handled the proper saving and restoring of
the register state (since on uniprocessor we lazy context switch the
register state for FP, AltiVec, and SPE).

-mno-spe disables the compiler for automatically generating SPE
instructions without our knowledge.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>