_i_n_M_a_t_r_i_x Specifies a pointer a to 2x2 matrix stored in column-major
order as four consecutive values.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
ggggllllccccMMMMuuuullllttttMMMMaaaattttrrrriiiixxxx multiplies GGGGLLLLCCCC____BBBBIIIITTTTMMMMAAAAPPPP____MMMMAAAATTTTRRRRIIIIXXXX with the one specified in
_i_n_M_a_t_r_i_x. The matrix is stored as
(||(aa aa)||)
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLLCCCC____SSSSTTTTAAAATTTTEEEE____EEEERRRRRRRROOOORRRR is generated if the issuing thread has no current GLC