Variable defined by the register keyword

Source: Internet
Author: User

Register I = rep3_dma_con;
for (I = 0; I <10; I ++);

/* Register is a storage type of variable, called register.
If a variable is defined as this type, it will be stored in general-purpose registers, so the storage speed is fast.
the benefit of this type is that if you need to use this variable frequently, you can avoid storing it from memory multiple times.

This improves the running efficiency.
it is just a prompt for the compiler. Whether it is register or not depends on how the compiler handles it. Not a mandatory method
modern Compiler optimization technology is good for storing variables into registers, so this keyword for modern compilers

it is useless, but it is still very useful in early compilers

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.