Strange error E6056

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Posted by: Byrhtferth
         
I've got the Freedom Vector set to some angle, and I execute this code:

GFV
SFVTCA[y]
[various instructions]
SFVFS

The [various instructions] leave the stack the same as it was after executing GFV (I've checked this over and over), but the rasterizer test in FV reports:

E6056
X and Y components of vector are invalid. X^2 + Y^2 != 0x4000^2

Is this possible? I'm sure I'm passing to SFVFS exactly the same numbers I've gotten from GFV. I don't see how there can be an error.

         

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