Use new abi for 128bit int to float cast intrinsics on Windows

Author: bjorn3

src/cast.rs

@@ -64,12 +64,28 @@ pub(crate) fn clif_int_or_float_cast(
                 },
             );
 
-            return fx.lib_call(
-                &name,
-                vec![AbiParam::new(types::I128)],
-                vec![AbiParam::new(to_ty)],
-                &[from],
-            )[0];
+            if fx.tcx.sess.target.is_like_windows {
+                let arg_place = CPlace::new_stack_slot(
+                    fx,
+                    fx.layout_of(if from_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 }),
+                );
+                let arg_ptr = arg_place.to_ptr();
+                arg_ptr.store(fx, from, MemFlags::trusted());
+                let args = [arg_ptr.get_addr(fx)];
+                return fx.lib_call(
+                    &name,
+                    vec![AbiParam::new(fx.pointer_type)],
+                    vec![AbiParam::new(to_ty)],
+                    &args,
+                )[0];
+            } else {
+                return fx.lib_call(
+                    &name,
+                    vec![AbiParam::new(types::I128)],
+                    vec![AbiParam::new(to_ty)],
+                    &[from],
+                )[0];
+            }
         }
 
         // int-like -> float

src/lib.rs

@@ -188,7 +188,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
     }
 
     fn target_features(&self, _sess: &Session, _allow_unstable: bool) -> Vec<rustc_span::Symbol> {
-        vec![]
+        vec![Symbol::intern("llvm14-builtins-abi")]
     }
 
     fn print_version(&self) {