This is a bug in the disassembler. According to the TMS320C67x/C67x+ DSP CPU and Instruction Set Reference Guide (SPRU733A), only the second operand (the double-precision input) may be fetched from the cross path. Therefore, the following instruction is not legal:
MPYSPDP.M2X A24,B27:B26,B7:B6
The opcode 0x036b15b2 should disassemble to:
MPYSPDP.M2X B24,A27:A26,B7:B6
I've submitted SDSCM00047563 to track this issue.