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large_assignments: Allow moves into functions

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Moves into functions are typically implemented with pointer passing
rather than memcpy's at the llvm-ir level, so allow moves into
functions.
This commit is contained in:
Martin Nordholts 2024-02-08 09:55:34 +01:00
parent 1a0200ebc0
commit e2979a8b8c
7 changed files with 66 additions and 17 deletions
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10
compiler/rustc_monomorphize/src/collector.rs
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@ -666,7 +666,15 @@ impl<'a, 'tcx> MirUsedCollector<'a, 'tcx> {
debug!(?def_id, ?fn_span);
for arg in args {
if let Some(too_large_size) = self.operand_size_if_too_large(limit, &arg.node) {
// Moving args into functions is typically implemented with pointer
// passing at the llvm-ir level and not by memcpy's. So always allow
// moving args into functions.
let operand: &mir::Operand<'tcx> = &arg.node;
if let mir::Operand::Move(_) = operand {
continue;
}
if let Some(too_large_size) = self.operand_size_if_too_large(limit, operand) {
self.lint_large_assignment(limit.0, too_large_size, location, arg.span);
};
}