6 files changed, 31 insertions, 11 deletions
diff --git a/compiler/rustc_codegen_llvm/src/asm.rs b/compiler/rustc_codegen_llvm/src/asm.rs
index 2ef6fd4942b..219a4f8fa89 100644
--- a/compiler/rustc_codegen_llvm/src/asm.rs
+++ b/compiler/rustc_codegen_llvm/src/asm.rs
@@ -285,13 +285,13 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
         let mut attrs = SmallVec::<[_; 2]>::new();
         if options.contains(InlineAsmOptions::PURE) {
             if options.contains(InlineAsmOptions::NOMEM) {
-                attrs.push(llvm::AttributeKind::ReadNone.create_attr(self.cx.llcx));
+                attrs.push(llvm::MemoryEffects::None.create_attr(self.cx.llcx));
             } else if options.contains(InlineAsmOptions::READONLY) {
-                attrs.push(llvm::AttributeKind::ReadOnly.create_attr(self.cx.llcx));
+                attrs.push(llvm::MemoryEffects::ReadOnly.create_attr(self.cx.llcx));
             }
             attrs.push(llvm::AttributeKind::WillReturn.create_attr(self.cx.llcx));
         } else if options.contains(InlineAsmOptions::NOMEM) {
-            attrs.push(llvm::AttributeKind::InaccessibleMemOnly.create_attr(self.cx.llcx));
+            attrs.push(llvm::MemoryEffects::InaccessibleMemOnly.create_attr(self.cx.llcx));
         } else {
             // LLVM doesn't have an attribute to represent ReadOnly + SideEffect
         }
diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index eff2436d41c..d96da5cc11d 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -13,7 +13,7 @@ use smallvec::SmallVec;
 
 use crate::attributes;
 use crate::llvm::AttributePlace::Function;
-use crate::llvm::{self, AllocKindFlags, Attribute, AttributeKind, AttributePlace};
+use crate::llvm::{self, AllocKindFlags, Attribute, AttributeKind, AttributePlace, MemoryEffects};
 use crate::llvm_util;
 pub use rustc_attr::{InlineAttr, InstructionSetAttr, OptimizeAttr};
 
@@ -303,10 +303,10 @@ pub fn from_fn_attrs<'ll, 'tcx>(
         to_add.push(AttributeKind::ReturnsTwice.create_attr(cx.llcx));
     }
     if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::FFI_PURE) {
-        to_add.push(AttributeKind::ReadOnly.create_attr(cx.llcx));
+        to_add.push(MemoryEffects::ReadOnly.create_attr(cx.llcx));
     }
     if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::FFI_CONST) {
-        to_add.push(AttributeKind::ReadNone.create_attr(cx.llcx));
+        to_add.push(MemoryEffects::None.create_attr(cx.llcx));
     }
     if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NAKED) {
         to_add.push(AttributeKind::Naked.create_attr(cx.llcx));
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 79ddfd884df..c22ec128dac 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -158,6 +158,10 @@ pub unsafe fn create_module<'ll>(
         if sess.target.arch == "s390x" {
             target_data_layout = target_data_layout.replace("-v128:64", "");
         }
+
+        if sess.target.arch == "riscv64" {
+            target_data_layout = target_data_layout.replace("-n32:64-", "-n64-");
+        }
     }
 
     // Ensure the data-layout values hardcoded remain the defaults.
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 42cb694c0e7..e2d0390821d 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -183,7 +183,6 @@ pub enum AttributeKind {
     OptimizeNone = 24,
     ReturnsTwice = 25,
     ReadNone = 26,
-    InaccessibleMemOnly = 27,
     SanitizeHWAddress = 28,
     WillReturn = 29,
     StackProtectReq = 30,
@@ -590,6 +589,15 @@ pub enum ChecksumKind {
     SHA256,
 }
 
+/// LLVMRustMemoryEffects
+#[derive(Copy, Clone)]
+#[repr(C)]
+pub enum MemoryEffects {
+    None,
+    ReadOnly,
+    InaccessibleMemOnly,
+}
+
 extern "C" {
     type Opaque;
 }
@@ -1175,6 +1183,7 @@ extern "C" {
     pub fn LLVMRustCreateUWTableAttr(C: &Context, async_: bool) -> &Attribute;
     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;
 
     // 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 6602a4ab863..f820e752371 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/mod.rs
@@ -185,6 +185,13 @@ impl AttributeKind {
     }
 }
 
+impl MemoryEffects {
+    /// Create an LLVM Attribute with these memory effects.
+    pub fn create_attr(self, llcx: &Context) -> &Attribute {
+        unsafe { LLVMRustCreateMemoryEffectsAttr(llcx, self) }
+    }
+}
+
 pub fn set_section(llglobal: &Value, section_name: &str) {
     let section_name_cstr = CString::new(section_name).expect("unexpected CString error");
     unsafe {
diff --git a/compiler/rustc_codegen_llvm/src/type_.rs b/compiler/rustc_codegen_llvm/src/type_.rs
index eeb38d4ecf5..5eec7dc6130 100644
--- a/compiler/rustc_codegen_llvm/src/type_.rs
+++ b/compiler/rustc_codegen_llvm/src/type_.rs
@@ -127,10 +127,6 @@ impl<'ll> CodegenCx<'ll, '_> {
     pub(crate) fn type_variadic_func(&self, args: &[&'ll Type], ret: &'ll Type) -> &'ll Type {
         unsafe { llvm::LLVMFunctionType(ret, args.as_ptr(), args.len() as c_uint, True) }
     }
-
-    pub(crate) fn type_array(&self, ty: &'ll Type, len: u64) -> &'ll Type {
-        unsafe { llvm::LLVMRustArrayType(ty, len) }
-    }
 }
 
 impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
@@ -231,6 +227,10 @@ impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     fn val_ty(&self, v: &'ll Value) -> &'ll Type {
         common::val_ty(v)
     }
+
+    fn type_array(&self, ty: &'ll Type, len: u64) -> &'ll Type {
+        unsafe { llvm::LLVMRustArrayType(ty, len) }
+    }
 }
 
 impl Type {