Add minimal working example for hessian sret type testing

Open Copilot opened this issue 3 months ago • 1 comments

Isolates a standalone test case for Forward-over-Reverse (Hessian) computation to diagnose enzyme_sret attribute handling.

Changes

Added test/hessian_mwe.jl - minimal reproducible test for nested AD with BatchDuplicated
Tests Forward-over-Reverse mode which exercises sret type handling in the compiler
Includes diagnostic output for identifying compilation timeouts

Example

# Run standalone to reproduce sret-related issues
julia --project=. test/hessian_mwe.jl

# Tests Hessian computation: H = [[2, 1], [1, 0]] for f(x) = x₁² + x₁x₂
# Uses BatchDuplicated in Forward-over-Reverse mode (~26s compilation)

The MWE targets the compiler path where enzyme_sret attributes are validated (lines 6747-6751 in src/compiler.jl).

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Dec 13 '25 22:12 Copilot

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Dec 13 '25 23:12 Copilot