Hello everybody: Here is an absolute register programming problem that I encountered with IXP1200 C (asm) compiler. The detail code goes here: __declspec(shared gp_reg) a; void main() { __asm alu[a, 1, +, a]; } The compiler will report an error: (0): error : #0: Inst has bad operands (d:\cvs\uc\ixp1200\uEngineC\pdev\ixp_cg\ixpasm.c, line 2109) While the IXP programming guide said the B operand and the dest_reg could use absolute register leaving A operand a immediate data. Is there anything wrong with my syntax or it is just a compiler bug? Besides, using global absolute register is convenient in the communications between threads, but this failure will lead to an exaggerate code generation which dramatically decrease the performance. I will very appreciate if anyone could help me. Zhanxi Tan Dep. of CS Tsinghua Univ.