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JIT: Optimize simple MUL/DIV arithmetic with GT_NEG #44375
Description
This is part 2 of #13837 to optimize multiplication and division arithmetic optimizations with GT_NEG.
Addition and subtraction have been completed in PR #43921.
int M5(int a) => -a / 10; // optimize to "a / -10"
int M6(int a) => -(a / 10); // optimize to "a / -10"
int M7(int a) => -a * 10; // optimize to "a * -10"
int M8(int a) => -(a * 10); // optimize to "a * -10"category:cq
theme:basic-cq
skill-level:beginner
cost:small
Activity
EgorBo commentedon Nov 7, 2020
A small note:
10->-10should not be done for IconHandle constant (#44266)alexcovington commentedon Nov 11, 2020
@JulieLeeMSFT This seems like a good introductory issue to get familiar with the JIT, which I've been looking for. Would you be able to assign this to me?
danmoseley commentedon Jan 27, 2021
@alexcovington is this issue now completed? If so we can close it.
perhaps there's another issue that's interesting among our codegen issues up for grabs: https://github.com/dotnet/runtime/issues?q=is%3Aopen+label%3Aup-for-grabs+label%3Aarea-CodeGen-coreclr+
alexcovington commentedon Jan 27, 2021
@danmosemsft Yes, I believe this can be closed now that #45604 has been merged in.
And I'll gladly take a look through 😄. Feel free to ping me for AMD-specific or x64 issues (I saw the amd-perf label which I'm following).
danmoseley commentedon Jan 27, 2021
@alexcovington great, we would be excited to have more of your contributions in .NET 6.0.
cc @BruceForstall in case he has specific interesting suggestions.
JulieLeeMSFT commentedon Jan 27, 2021
@alexcovington thanks a lot for your contribution to JIT.
cc @sandreenko for any suggestions for alexcovington.