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I've got a problem with the toolchain, where I'm doing something like this:

static inline void SetupMatrix (MATRIX mat)
{
asm __volatile__ ("\n\
lqc2 vf4,0x00(%0)\n\
lqc2 vf5,0x10(%0)\n\
lqc2 vf6,0x20(%0)\n\
lqc2 vf7,0x30(%0)\n\
": : "r" (mat));
}

The compiler is throwing up this error:

error: Internal compiler error at expr.c:2672

Where the line it is throwing up on is asm __volatile__ line. It is also complaining about this:

error C2143: syntax error : missing ')' before ':'

Which is referring to the ": : "r" (mat)); line

Any ideas?

Probably your compiler settings because I copied and pasted it into my code and it compiled perfectly.

I even used it to write my own little asm test,
which again compiled perfectly and worked(I.e it outputted 50) so I don't think your code is at fault.