[Merged by Bors] - Use opcode table rather than match #2501
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Codecov Report
@@ Coverage Diff @@
## main #2501 +/- ##
==========================================
+ Coverage 51.43% 51.59% +0.16%
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Files 354 354
Lines 35767 35641 -126
==========================================
- Hits 18395 18390 -5
+ Misses 17372 17251 -121
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jedel1043
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HalidOdat,
jasonwilliams,
nekevss,
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raskad and
Razican
jedel1043
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jedel1043
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Dec 21, 2022
jedel1043
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Dec 21, 2022
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This is awesome @tunz thanks, will take a look when I have time or in the new year |
HalidOdat
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Dec 23, 2022
nekevss
approved these changes
Dec 26, 2022
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bors r+ |
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Dec 26, 2022
`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).
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Build failed: |
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bors r+ |
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Dec 26, 2022
`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).
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Build failed: |
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 linear table jump by rust compiler, so it may use multiple branches to find the function. This change makes the opcode to use a table explicitly. This change improves the benchmark score of Richards about 1-2% (22.8 -> 23.2).
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Rebased to see if that's what's causing the fail |
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bors r+ |
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`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).
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Pull request successfully merged into main. Build succeeded: |
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execute_instructionis heavily used. After decoding an opcode,matchis used to find a properexecutefunction for the opcode. But, thematchmay 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, onlyenum -> &'static strcase was optimized to use a table whileenum -> function calluses multiple branches. (gotbolt)This change makes the opcode to use a table explicitly. It improves the benchmark score of Richards by 1-2% (22.8 -> 23.2).