-
-
Notifications
You must be signed in to change notification settings - Fork 400
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Use opcode table rather than match (#2501)
`execute_instruction` is heavily used. After decoding an opcode, `match` is used to find a proper `execute` function for the opcode. But, the `match` may not be able to be optimized into a table jump by rust compiler, so it may use multiple branches to find the function. When I tested with a toy program, only `enum -> &'static str` case was optimized to use a table while `enum -> function call` uses multiple branches. ([gotbolt](https://rust.godbolt.org/z/1rzK5vj6f)) This change makes the opcode to use a table explicitly. It improves the benchmark score of Richards by 1-2% (22.8 -> 23.2).
- Loading branch information
Showing
1 changed file
with
18 additions
and
18 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters