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[RF] Bring vectorizing EvalBackends to createChi2 / chi2FitTo#22036

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[RF] Bring vectorizing EvalBackends to createChi2 / chi2FitTo#22036
guitargeek wants to merge 1 commit intoroot-project:masterfrom
guitargeek:chi2_cpu

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The createChi2() / chi2FitTo() so far always went through the legacy RooChi2Var. This commit wires them up to the same evaluation pipeline that createNLL() uses, so all of Cpu, Cuda, Codegen and CodegenNoGrad backend now work for chi-squared fits.

The `createChi2()` / `chi2FitTo()` so far always went through the legacy
`RooChi2Var`. This commit wires them up to the same evaluation pipeline
that `createNLL()` uses, so all of Cpu, Cuda, Codegen and CodegenNoGrad
backend now work for chi-squared fits.
@guitargeek guitargeek self-assigned this Apr 23, 2026
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Test Results

    22 files      22 suites   3d 6h 51m 47s ⏱️
 3 847 tests  3 844 ✅  1 💤 2 ❌
75 965 runs  75 945 ✅ 18 💤 2 ❌

For more details on these failures, see this check.

Results for commit 1d3623b.

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