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AstGen: short-circuit rvalue() if code is unreachable

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This avoids generating instructions which will never be reached.
This commit is contained in:
Isaac Freund 2021-08-28 23:18:47 +02:00
parent 4bb5d17edc
commit 7b863aa8ac
1 changed files with 2 additions and 1 deletions
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3
src/AstGen.zig
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@ -8389,7 +8389,7 @@ fn nodeImpliesRuntimeBits(tree: *const ast.Tree, start_node: ast.Node.Index) boo
}
}
/// Applies `rl` semantics to `inst`. Expressions which do not do their own handling of
/// Applies `rl` semantics to `result`. Expressions which do not do their own handling of
/// result locations must call this function on their result.
/// As an example, if the `ResultLoc` is `ptr`, it will write the result to the pointer.
/// If the `ResultLoc` is `ty`, it will coerce the result to the type.
@ -8399,6 +8399,7 @@ fn rvalue(
result: Zir.Inst.Ref,
src_node: ast.Node.Index,
) InnerError!Zir.Inst.Ref {
if (gz.endsWithNoReturn()) return result;
switch (rl) {
.none, .none_or_ref, .coerced_ty => return result,
.discard => {