Bruno Cardoso Lopes 1228142a5d [CIR] Implement PredefinedExpr in aggregate emitter and add consteval… (#194484) ...

… aggregate test

Handle PredefinedExpr by delegating to emitAggLoadOfLValue, removing the
NYI fallback. Also add a test for ConstantExpr aggregate emission
(consteval functions returning structs), which was already implemented
but lacked test coverage.

This unblocks ~206 libcxx test failures that involve aggregate
ConstantExpr and PredefinedExpr.

Note on LLVM IR divergence (will be addressed in follow-up PRs): For
consteval functions returning aggregates, CIR currently emits a global
constant + cir.copy that lowers to llvm.memcpy from the global, while
OGCG decomposes the constant into per-field stores. The added CIR / LLVM
/ OGCG CHECK lines in consteval-aggregate.cpp document this difference.
Convergence will come from a follow-up that decomposes the consteval
aggregate stores into per-field stores in LoweringPrepare (and related
GEP-index handling for padded structs).

2026-04-27 18:09:24 -07:00

1.7 KiB

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