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Sink ptrtoint for RMW ops on pointers to cg_llvm

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This commit is contained in:
Ben Kimock 2024-03-08 21:50:23 -05:00
parent 42825768b1
commit aa6cfb2669
3 changed files with 18 additions and 42 deletions
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8
compiler/rustc_codegen_llvm/src/builder.rs
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@ -1132,9 +1132,15 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
&mut self,
op: rustc_codegen_ssa::common::AtomicRmwBinOp,
dst: &'ll Value,
src: &'ll Value,
mut src: &'ll Value,
order: rustc_codegen_ssa::common::AtomicOrdering,
) -> &'ll Value {
// The only RMW operation that LLVM supports on pointers is compare-exchange.
if self.val_ty(src) == self.type_ptr()
&& op != rustc_codegen_ssa::common::AtomicRmwBinOp::AtomicXchg
{
src = self.ptrtoint(src, self.type_isize());
}
unsafe {
llvm::LLVMBuildAtomicRMW(
self.llbuilder,