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Expound upon Fence's empty implementation being correct.

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This commit is contained in:
Nick Lewycky
2019-08-16 15:23:40 -07:00
parent aecce465c7
commit c8378329c1
1 changed files with 16 additions and 10 deletions
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26
lib/llvm-backend/src/code.rs
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@ -4447,18 +4447,24 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
state.push1(res);
}
/*
Operator::Wake { ref memarg: _ } => {
unimplemented!();
}
Operator::I32Wait { ref memarg: _ } => {
unimplemented!();
}
Operator::I64Wait { ref memarg: _ } => {
unimplemented!();
}
Operator::Wake { ref memarg: _ } => {
unimplemented!();
}
Operator::I32Wait { ref memarg: _ } => {
unimplemented!();
}
Operator::I64Wait { ref memarg: _ } => {
unimplemented!();
}
*/
Operator::Fence { flags: _ } => {
// fence is a no-op
// Fence is a nop.
//
// Fence was added to preserve information about fences from
// source languages. If in the future Wasm extends the memory
// model, and if we hadn't recorded what fences used to be there,
// it would lead to data races that weren't present in the
// original source language.
}
Operator::I32AtomicLoad { ref memarg } => {
let effective_address = resolve_memory_ptr(