Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
How would you go about doing a bit shift in NASM on a register? I read the manual and it only seems to mention these operators >>, <<. When I try to use them NASM complains about the shift operator working on scalar values. Can you explain what a scalar value is and give an example of how to use >> and <<. Also, I thought there were a shr or shl operators. If they do exist can you give an example of how to use them? Thank you for your time.
<<and>>are for use with integer constants only. This is what it means by “scalar value”. You can shift the value in a register using theshlorshrinstructions. They are used to shift the value in a register left or right, respectively, a given number of bits.The first line in this example shifts the value in
axleft 4 bits, which is the same as multiplying it by 16. The second line shifts the value inbxright by 2 bits, which is the same as integer division by 4.You can also use
clto indicate the number of bits to shift, instead of a constant. For more information on these and related instructions, see this page.