fitzgen opened issue #13485:
Propagate
trapzbackwards fromref.castinto the branch-y instance-of check that it emits. Similar for the jumps inside abr_on_cast[_fail]'s instance-of check. See https://github.com/bytecodealliance/wasmtime/pull/9437#discussion_r1795656924 for details. Alternatively, clean this stuff up in the mid-end: https://github.com/bytecodealliance/wasmtime/issues/6106
fitzgen added the performance label to Issue #13485.
fitzgen added the wasm-proposal:gc label to Issue #13485.
Last updated: Jun 01 2026 at 09:49 UTC