Use LLVMIntrinsicGetDeclaration to completely remove the hardcoded intrinsics list

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -1078,8 +1078,6 @@ unsafe extern "C" {
 
     // Operations on other types
     pub(crate) fn LLVMVoidTypeInContext(C: &Context) -> &Type;
-    pub(crate) fn LLVMTokenTypeInContext(C: &Context) -> &Type;
-    pub(crate) fn LLVMMetadataTypeInContext(C: &Context) -> &Type;
 
     // Operations on all values
     pub(crate) fn LLVMTypeOf(Val: &Value) -> &Type;
@@ -1198,14 +1196,12 @@ unsafe extern "C" {
 
     // Operations about llvm intrinsics
     pub(crate) fn LLVMLookupIntrinsicID(Name: *const c_char, NameLen: size_t) -> c_uint;
-    pub(crate) fn LLVMIntrinsicIsOverloaded(ID: NonZero<c_uint>) -> Bool;
-    pub(crate) fn LLVMIntrinsicCopyOverloadedName2<'a>(
+    pub(crate) fn LLVMGetIntrinsicDeclaration<'a>(
         Mod: &'a Module,
         ID: NonZero<c_uint>,
         ParamTypes: *const &'a Type,
         ParamCount: size_t,
-        NameLength: *mut size_t,
-    ) -> *mut c_char;
+    ) -> &'a Value;
 
     // Operations on parameters
     pub(crate) fn LLVMIsAArgument(Val: &Value) -> Option<&Value>;

compiler/rustc_codegen_llvm/src/llvm/mod.rs

@@ -2,9 +2,9 @@
 
 use std::ffi::{CStr, CString};
 use std::num::NonZero;
+use std::ptr;
 use std::str::FromStr;
 use std::string::FromUtf8Error;
-use std::{ptr, slice};
 
 use libc::c_uint;
 use rustc_abi::{Align, Size, WrappingRange};
@@ -339,34 +339,14 @@ impl Intrinsic {
         NonZero::new(id).map(|id| Self { id })
     }
 
-    pub(crate) fn is_overloaded(self) -> bool {
-        unsafe { LLVMIntrinsicIsOverloaded(self.id) == True }
-    }
-
-    pub(crate) fn overloaded_name<'ll>(
+    pub(crate) fn get_declaration<'ll>(
         self,
         llmod: &'ll Module,
         type_params: &[&'ll Type],
-    ) -> String {
-        let mut len = 0;
-        let ptr = unsafe {
-            LLVMIntrinsicCopyOverloadedName2(
-                llmod,
-                self.id,
-                type_params.as_ptr(),
-                type_params.len(),
-                &mut len,
-            )
-        };
-
-        let slice = unsafe { slice::from_raw_parts_mut(ptr.cast(), len) };
-        let copied = str::from_utf8(slice).expect("Non-UTF8 intrinsic name").to_string();
-
+    ) -> &'ll Value {
         unsafe {
-            libc::free(ptr.cast());
+            LLVMGetIntrinsicDeclaration(llmod, self.id, type_params.as_ptr(), type_params.len())
         }
-
-        copied
     }
 }