Raising: unroll budget for constant-bound loops - #3004
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Nested constant-bound loops unroll multiplicatively: mfem's generic max-degree EA fallback kernels reached millions of ops and a 2 GB object (one embedded module was a gigabyte of text). Estimate the unrolled op count and, past a 64k budget, try the while raising first even when unrolling is preferred: the diffusion EA object shrinks from 2 GB to 78 MB and still raises fully. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016zErYp7upmqr4NHfhod9UD
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Nested constant-bound loops unroll multiplicatively: mfem's generic max-degree EA fallback kernels (runtime degree, loops bounded by
MAX_D1D-style constants) reached millions of ops —bilininteg_diffusion_ea.cppproduced a 2 GB object whose largest embedded module was a gigabyte of textual IR with SSA ids past 2.2M. Estimate the unrolled op count recursively and, past a 64k budget, try the while raising first even when unrolling is preferred (prefer_while_raising=false): the diffusion EA object shrinks to 78 MB, convection EA 935 MB → 30 MB, all still raising fully.Part of #2968.
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https://claude.ai/code/session_016zErYp7upmqr4NHfhod9UD