4 files changed, 45 insertions, 24 deletions
diff --git a/compiler/rustc_codegen_llvm/src/llvm/archive_ro.rs b/compiler/rustc_codegen_llvm/src/llvm/archive_ro.rs
index 7d948970223..4dabde55e98 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/archive_ro.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/archive_ro.rs
@@ -1,9 +1,9 @@
 //! A wrapper around LLVM's archive (.a) code
 
-use rustc_fs_util::path_to_c_string;
 use std::path::Path;
-use std::slice;
-use std::str;
+use std::{slice, str};
+
+use rustc_fs_util::path_to_c_string;
 
 pub struct ArchiveRO {
     pub raw: &'static mut super::Archive,
diff --git a/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs b/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
index 73e1b08a3d7..a4cb5a25d1b 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
@@ -1,13 +1,12 @@
 //! LLVM diagnostic reports.
 
-pub use self::Diagnostic::*;
-pub use self::OptimizationDiagnosticKind::*;
-
-use crate::value::Value;
 use libc::c_uint;
+use rustc_span::InnerSpan;
 
+pub use self::Diagnostic::*;
+pub use self::OptimizationDiagnosticKind::*;
 use super::{DiagnosticInfo, SMDiagnostic};
-use rustc_span::InnerSpan;
+use crate::value::Value;
 
 #[derive(Copy, Clone, Debug)]
 pub enum OptimizationDiagnosticKind {
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 3beda28ac1f..faabbcb020d 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -1,18 +1,16 @@
 #![allow(non_camel_case_types)]
 #![allow(non_upper_case_globals)]
 
+use std::marker::PhantomData;
+
+use libc::{c_char, c_int, c_uint, c_ulonglong, c_void, size_t};
+
 use super::debuginfo::{
     DIArray, DIBasicType, DIBuilder, DICompositeType, DIDerivedType, DIDescriptor, DIEnumerator,
     DIFile, DIFlags, DIGlobalVariableExpression, DILexicalBlock, DILocation, DINameSpace,
     DISPFlags, DIScope, DISubprogram, DISubrange, DITemplateTypeParameter, DIType, DIVariable,
     DebugEmissionKind, DebugNameTableKind,
 };
-
-use libc::{c_char, c_int, c_uint, size_t};
-use libc::{c_ulonglong, c_void};
-
-use std::marker::PhantomData;
-
 use super::RustString;
 
 pub type Bool = c_uint;
@@ -428,6 +426,7 @@ pub enum MetadataType {
     MD_nontemporal = 9,
     MD_mem_parallel_loop_access = 10,
     MD_nonnull = 11,
+    MD_unpredictable = 15,
     MD_align = 17,
     MD_type = 19,
     MD_vcall_visibility = 28,
@@ -697,9 +696,10 @@ pub type DiagnosticHandlerTy = unsafe extern "C" fn(&DiagnosticInfo, *mut c_void
 pub type InlineAsmDiagHandlerTy = unsafe extern "C" fn(&SMDiagnostic, *const c_void, c_uint);
 
 pub mod debuginfo {
-    use super::{InvariantOpaque, Metadata};
     use bitflags::bitflags;
 
+    use super::{InvariantOpaque, Metadata};
+
     #[repr(C)]
     pub struct DIBuilder<'a>(InvariantOpaque<'a>);
 
@@ -1575,6 +1575,12 @@ extern "C" {
     pub fn LLVMRustCreateAllocSizeAttr(C: &Context, size_arg: u32) -> &Attribute;
     pub fn LLVMRustCreateAllocKindAttr(C: &Context, size_arg: u64) -> &Attribute;
     pub fn LLVMRustCreateMemoryEffectsAttr(C: &Context, effects: MemoryEffects) -> &Attribute;
+    pub fn LLVMRustCreateRangeAttribute(
+        C: &Context,
+        num_bits: c_uint,
+        lower_words: *const u64,
+        upper_words: *const u64,
+    ) -> &Attribute;
 
     // Operations on functions
     pub fn LLVMRustGetOrInsertFunction<'a>(
diff --git a/compiler/rustc_codegen_llvm/src/llvm/mod.rs b/compiler/rustc_codegen_llvm/src/llvm/mod.rs
index 6ab1eea9597..d0db350a149 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/mod.rs
@@ -1,5 +1,15 @@
 #![allow(non_snake_case)]
 
+use std::cell::RefCell;
+use std::ffi::{CStr, CString};
+use std::str::FromStr;
+use std::string::FromUtf8Error;
+
+use libc::c_uint;
+use rustc_data_structures::small_c_str::SmallCStr;
+use rustc_llvm::RustString;
+use rustc_target::abi::{Align, Size, WrappingRange};
+
 pub use self::AtomicRmwBinOp::*;
 pub use self::CallConv::*;
 pub use self::CodeGenOptSize::*;
@@ -8,15 +18,6 @@ pub use self::Linkage::*;
 pub use self::MetadataType::*;
 pub use self::RealPredicate::*;
 
-use libc::c_uint;
-use rustc_data_structures::small_c_str::SmallCStr;
-use rustc_llvm::RustString;
-use rustc_target::abi::Align;
-use std::cell::RefCell;
-use std::ffi::{CStr, CString};
-use std::str::FromStr;
-use std::string::FromUtf8Error;
-
 pub mod archive_ro;
 pub mod diagnostic;
 mod ffi;
@@ -104,6 +105,21 @@ pub fn CreateAllocKindAttr(llcx: &Context, kind_arg: AllocKindFlags) -> &Attribu
     unsafe { LLVMRustCreateAllocKindAttr(llcx, kind_arg.bits()) }
 }
 
+pub fn CreateRangeAttr(llcx: &Context, size: Size, range: WrappingRange) -> &Attribute {
+    let lower = range.start;
+    let upper = range.end.wrapping_add(1);
+    let lower_words = [lower as u64, (lower >> 64) as u64];
+    let upper_words = [upper as u64, (upper >> 64) as u64];
+    unsafe {
+        LLVMRustCreateRangeAttribute(
+            llcx,
+            size.bits().try_into().unwrap(),
+            lower_words.as_ptr(),
+            upper_words.as_ptr(),
+        )
+    }
+}
+
 #[derive(Copy, Clone)]
 pub enum AttributePlace {
     ReturnValue,