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arm64: Additions with GetActiveElementCount() should use incp when given the same predicate #114628

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arm64: Additions with GetActiveElementCount() should use incp when given the same predicate #114628

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@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Apr 14, 2025
@dotnet-policy-service dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label Apr 14, 2025
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@a74nh @kunalspathak @dotnet/arm64-contrib

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

@kunalspathak kunalspathak added the arm-sve Work related to arm64 SVE/SVE2 support label Apr 25, 2025
@kunalspathak kunalspathak self-requested a review April 25, 2025 22:03
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@jonathandavies-arm - can you fix the build errors?

  D:\a\_work\1\s\src\coreclr\jit\lower.cpp(7211) : error C4701: potentially uninitialized local variable 'next' used

kunalspathak
kunalspathak reviewed Apr 25, 2025
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src/coreclr/jit/lowerarmarch.cpp
const GenTreeHWIntrinsic* elementCountNode = op1->AsHWIntrinsic();
GenTree* mask1 = elementCountNode->Op(1)->AsHWIntrinsic()->Op(2);
GenTree* mask2 = elementCountNode->Op(2)->AsHWIntrinsic()->Op(2);
if (mask1->GetVN(VNK_Liberal) != mask2->GetVN(VNK_Liberal))
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So here we are using value numbering to contain the node, which seems wrong. This should ideally be happening in VN/CSE. Did you check why that is not happening?

This was referenced Apr 26, 2025
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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI arm-sve Work related to arm64 SVE/SVE2 support community-contribution Indicates that the PR has been added by a community member
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ARM64-SVE: Additions with GetActiveElementCount() should use incp
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