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More accurate comment for EmptyArray

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This commit is contained in:
Brian Carroll 2021-12-07 23:21:31 +00:00
parent 73c9c7089a
commit f6b6d91c56
1 changed files with 3 additions and 4 deletions
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7
compiler/gen_wasm/src/backend.rs
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@ -640,10 +640,9 @@ impl<'a> WasmBackend<'a> {
let (local_id, offset) =
location.local_and_offset(self.storage.stack_frame_pointer);
// This is a minor cheat. We only need the first two 32 bit
// chunks here. We fill both chunks with zeros, so we
// can simplify things to a single group of 64 bit operations instead of
// doing the below twice for 32 bits.
// This is a minor cheat.
// What we want to write to stack memory is { elements: null, length: 0 }
// But instead of two 32-bit stores, we can do a single 64-bit store.
self.code_builder.get_local(local_id);
self.code_builder.i64_const(0);
self.code_builder.i64_store(Align::Bytes4, offset);