Dan Gohman 118445841d [WebAssembly] Protect memory.fill and memory.copy from zero-length ranges. (#112617) ...

WebAssembly's `memory.fill` and `memory.copy` instructions trap if the
pointers are out of bounds, even if the length is zero. This is
different from LLVM, which expects that it can call `memcpy` on
arbitrary invalid pointers if the length is zero. To avoid spurious
traps, branch around `memory.fill` and `memory.copy` when the length is
zero.

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Co-authored-by: Heejin Ahn <aheejin@gmail.com>

2024-10-24 14:13:58 -07:00

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