Can someone answer the following LC3 questions. 1.When must an LC3 assembly lang
ID: 3827058 • Letter: C
Question
Can someone answer the following LC3 questions.1.When must an LC3 assembly language programmer use JMP instead of BR
2.Can an LC3 programmer simply use JMP instead of JSSR? Why or why not?
Please help. Can someone answer the following LC3 questions.
1.When must an LC3 assembly language programmer use JMP instead of BR
2.Can an LC3 programmer simply use JMP instead of JSSR? Why or why not?
Please help.
1.When must an LC3 assembly language programmer use JMP instead of BR
2.Can an LC3 programmer simply use JMP instead of JSSR? Why or why not?
Please help.
Explanation / Answer
1.BR instruction specifies one or more condition codes. if a specified bit is set then branch is taken,if a branch is not taken then it moves to next instruction whereas JMP instruction is always taken and is an unconditional branch,it allows any target address specified by register whereas in BR instruction the targeted address must be only 256 words which also includes signed offset.so most of the time we often use program with different conditions which are unexpected so programmer use JMP instruction rather than BR as we will call it whenever we want and return to the same we have came i.e return back to the next instruction after calling
2.no JMP calls backs to the calling routine whereas the JSRR returns to the subroutine saving the called (curent instruction) routine to a specified register unlike JMP even the program counter can be increased while JSRR is called which is not possible in JSR or JMP instruction