The ADD or SUB instruction does not work when the same unit is used for the instructions and when there is NOP 2 between instructions. I can see the issue on C6748 and C6713.
For example:
06B4F218 ADDSP.L1X A7,B13,A13
00002000 NOP 2
060440D8 SUB.L1 2,A1,A12
06B4F23A SUBSP.L2X B7,A13,B13
00002000 NOP 2
0604805A ADD.L2 4,B1,B12
Is there any error in these codes?
If the instructions are successive (there is not NOP) or there is NOP except 2 cycles between the instructions, it works fine. It seems not to work only when 3 cycles passed after the ADDSP or SUBSP instruction.
For the details of this isuue, please see this post: http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/441181
Best regards,
Daisuke
