[mw_shl_code=c,true]#define ABSDIFF(frame1, frame2) ({ int result = 0; asm volatile( "mov %[result], #0 " /* accumulator */ "ldr r4, [%[src], #0] " /* read data from address + offset*/ "ldr r5, [%[dst], #0] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #4] " /* read data from address + offset */ "ldr r5, [%[dst], #4] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 1)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 1)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 1 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 1 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 2)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 2)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 2 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 2 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 3)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 3)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 3 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 3 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 4)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 4 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 4 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 5)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 5)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 5 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 5 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 6)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 6)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 6 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 6 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 7)] " /* read data from address + offset*/ "ldr r5, [%[dst], #(64 * 7)] " "usada8 %[result], r4, r5, %[result] " /* difference */ "ldr r4, [%[src], #(64 * 7 + 4)] " /* read data from address + offset */ "ldr r5, [%[dst], #(64 * 7 + 4)] " "usada8 %[result], r4, r5, %[result] " /* difference */ : [result] "+r" (result) : [src] "r" (frame1), [dst] "r" (frame2) : "r4", "r5" ); result; })[/mw_shl_code] 然后在后边调用：uint32_t temp_dist = ABSDIFF(base1, base2+ii);
出错： error:  #29: expected an expression.                                         
                    temp_dist = ABSDIFF(base1, base2+ii);
请教大神怎么解决