xinghuayu007 opened a new pull request #6324: URL: https://github.com/apache/incubator-doris/pull/6324
## Proposed changes Currently, `ltrim` and `rtrim` function can only compare one character with blank at a time. For 128 bits register, it can compare 16 characters at a time using SIMD. Therefore, using SIMD can speedup performance greatly. When there is less than 2 blanks, vetorized-ltrim has the same performance with non-vectorized-ltrim, but when blanks are more than 3, performance can be improved more than 2-3 times. Here are the test results: **tests 1000 times, the unit is ns** **ltrim function:** 2 blanks vectorization: 60944 normal: 68471 3 blanks vectorization: 70170 normal: 83194 8 blanks vectorization: 75192 normal: 152855 22 blanks wangxixu-vectorization: 77532 wangxixu-normal: 255719 **rtrim functions:** 2 blanks vectorization: 88203 normal: 122999 3 blanks vectorization: 79561 normal: 130995 8 blanks vectorization: 15061465 normal: 2498301 22 vectorization: 96263 normal: 316270 _**The code refers no any other system, implemented by myself.**_ ## Types of changes What types of changes does your code introduce to Doris? _Put an `x` in the boxes that apply_ - [ ] Bugfix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected) - [ ] Documentation Update (if none of the other choices apply) - [ ] Code refactor (Modify the code structure, format the code, etc...) - [ ] Optimization. Including functional usability improvements and performance improvements. - [ ] Dependency. Such as changes related to third-party components. - [ ] Other. ## Checklist _Put an `x` in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code._ - [ ] I have created an issue on (Fix #ISSUE) and described the bug/feature there in detail - [ ] Compiling and unit tests pass locally with my changes - [ ] I have added tests that prove my fix is effective or that my feature works - [ ] If these changes need document changes, I have updated the document - [ ] Any dependent changes have been merged ## Further comments If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
