Good afternoon,
This is my first post here, so feel free to make any kind of remarks :)
I've been trying to use a temporary floating-point register in inline asm,
but nothing seems to work.
On the code below, I'm storing the result of the product in a temporary
variable (fra).
inline void MTH_Vec3Scale(register MTH_tt_Vector3 *D,register const
MTH_tt_Vector3 *A, register f32 f)
{
register f32 fra;
asm ( "lfs %3, 0(%0) \n" // FRA <- *A
"\t fmul %3, %3, %2 \n" // FRT <- FRA
* FRC
"\t stfs %3, 0(%1) \n" // *dest =
FRT
"\t lfs %3, 4(%0) \n"
"\t fmul %3, %3, %2 \n"
"\t stfs %3, 4(%1) \n"
"\t lfs %3, 8(%0) \n"
"\t fmul %3, %3, %2 \n"
"\t stfs %3, 8(%1) \n"
/* outputs: */ :
/* inputs : */ :"b"(A),"b"(D),"f"(f),"f"(fra)
/* clobbers:*/ :"memory");
}
What I would like to do is to use a floating-point register directly, f11
for instance, to store the results:
lfs %3, 0(%0)
would be come
lfs f11, 0(%0)
for instance.
I would add "f11" to the list of clobber registers. But it won't let me,
complaining that "f11" is unknown register. "fr11" doesn't work either. I
have given it many tries ...
If anyone had some more documentation about PowerPC 's asm with gcc I'd love
to hear about it.
Thanks!
But every time I do that, I end up with the error : "unknown register f11"
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