make prefetch intrinsics safe

2025-08-19 22:16:58 +02:00
parent 51df7aabbe
commit d25910eaeb
5 changed files with 70 additions and 72 deletions
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -330,10 +330,16 @@ impl<'ll, 'tcx> IntrinsicCallBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                    _ => bug!(),
                };
                let ptr = args[0].immediate();
+                let locality = fn_args.const_at(1).to_value().valtree.unwrap_leaf().to_u32() as i32;
                self.call_intrinsic(
                    "llvm.prefetch",
                    &[self.val_ty(ptr)],
-                    &[ptr, self.const_i32(rw), args[1].immediate(), self.const_i32(cache_type)],
+                    &[
+                        ptr,
+                        self.const_i32(rw),
+                        self.const_i32(locality),
+                        self.const_i32(cache_type),
+                    ],
                )
            }
            sym::carrying_mul_add => {