Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1508 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_llvm/src/builder.rs b/compiler/rustc_codegen_llvm/src/builder.rs
new file mode 100644
index 000000000..d3096c73a
--- /dev/null
+++ b/compiler/rustc_codegen_llvm/src/builder.rs
@@ -0,0 +1,1508 @@
+use crate::attributes;
+use crate::common::Funclet;
+use crate::context::CodegenCx;
+use crate::llvm::{self, BasicBlock, False};
+use crate::llvm::{AtomicOrdering, AtomicRmwBinOp, SynchronizationScope};
+use crate::llvm_util;
+use crate::type_::Type;
+use crate::type_of::LayoutLlvmExt;
+use crate::value::Value;
+use cstr::cstr;
+use libc::{c_char, c_uint};
+use rustc_codegen_ssa::common::{IntPredicate, RealPredicate, TypeKind};
+use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
+use rustc_codegen_ssa::mir::place::PlaceRef;
+use rustc_codegen_ssa::traits::*;
+use rustc_codegen_ssa::MemFlags;
+use rustc_data_structures::small_c_str::SmallCStr;
+use rustc_hir::def_id::DefId;
+use rustc_middle::ty::layout::{
+    FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, TyAndLayout,
+};
+use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_span::Span;
+use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
+use rustc_target::spec::{HasTargetSpec, Target};
+use std::borrow::Cow;
+use std::ffi::CStr;
+use std::iter;
+use std::ops::Deref;
+use std::ptr;
+use tracing::{debug, instrument};
+
+// All Builders must have an llfn associated with them
+#[must_use]
+pub struct Builder<'a, 'll, 'tcx> {
+    pub llbuilder: &'ll mut llvm::Builder<'ll>,
+    pub cx: &'a CodegenCx<'ll, 'tcx>,
+}
+
+impl Drop for Builder<'_, '_, '_> {
+    fn drop(&mut self) {
+        unsafe {
+            llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
+        }
+    }
+}
+
+// FIXME(eddyb) use a checked constructor when they become `const fn`.
+const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
+
+/// Empty string, to be used where LLVM expects an instruction name, indicating
+/// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
+// FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
+const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
+
+impl<'ll, 'tcx> BackendTypes for Builder<'_, 'll, 'tcx> {
+    type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
+    type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
+    type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
+    type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
+    type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;
+
+    type DIScope = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIScope;
+    type DILocation = <CodegenCx<'ll, 'tcx> as BackendTypes>::DILocation;
+    type DIVariable = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIVariable;
+}
+
+impl abi::HasDataLayout for Builder<'_, '_, '_> {
+    fn data_layout(&self) -> &abi::TargetDataLayout {
+        self.cx.data_layout()
+    }
+}
+
+impl<'tcx> ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
+    #[inline]
+    fn tcx(&self) -> TyCtxt<'tcx> {
+        self.cx.tcx
+    }
+}
+
+impl<'tcx> ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
+    fn param_env(&self) -> ty::ParamEnv<'tcx> {
+        self.cx.param_env()
+    }
+}
+
+impl HasTargetSpec for Builder<'_, '_, '_> {
+    #[inline]
+    fn target_spec(&self) -> &Target {
+        self.cx.target_spec()
+    }
+}
+
+impl<'tcx> LayoutOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
+    type LayoutOfResult = TyAndLayout<'tcx>;
+
+    #[inline]
+    fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
+        self.cx.handle_layout_err(err, span, ty)
+    }
+}
+
+impl<'tcx> FnAbiOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
+    type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
+
+    #[inline]
+    fn handle_fn_abi_err(
+        &self,
+        err: FnAbiError<'tcx>,
+        span: Span,
+        fn_abi_request: FnAbiRequest<'tcx>,
+    ) -> ! {
+        self.cx.handle_fn_abi_err(err, span, fn_abi_request)
+    }
+}
+
+impl<'ll, 'tcx> Deref for Builder<'_, 'll, 'tcx> {
+    type Target = CodegenCx<'ll, 'tcx>;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        self.cx
+    }
+}
+
+impl<'ll, 'tcx> HasCodegen<'tcx> for Builder<'_, 'll, 'tcx> {
+    type CodegenCx = CodegenCx<'ll, 'tcx>;
+}
+
+macro_rules! builder_methods_for_value_instructions {
+    ($($name:ident($($arg:ident),*) => $llvm_capi:ident),+ $(,)?) => {
+        $(fn $name(&mut self, $($arg: &'ll Value),*) -> &'ll Value {
+            unsafe {
+                llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
+            }
+        })+
+    }
+}
+
+impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
+    fn build(cx: &'a CodegenCx<'ll, 'tcx>, llbb: &'ll BasicBlock) -> Self {
+        let bx = Builder::with_cx(cx);
+        unsafe {
+            llvm::LLVMPositionBuilderAtEnd(bx.llbuilder, llbb);
+        }
+        bx
+    }
+
+    fn cx(&self) -> &CodegenCx<'ll, 'tcx> {
+        self.cx
+    }
+
+    fn llbb(&self) -> &'ll BasicBlock {
+        unsafe { llvm::LLVMGetInsertBlock(self.llbuilder) }
+    }
+
+    fn set_span(&mut self, _span: Span) {}
+
+    fn append_block(cx: &'a CodegenCx<'ll, 'tcx>, llfn: &'ll Value, name: &str) -> &'ll BasicBlock {
+        unsafe {
+            let name = SmallCStr::new(name);
+            llvm::LLVMAppendBasicBlockInContext(cx.llcx, llfn, name.as_ptr())
+        }
+    }
+
+    fn append_sibling_block(&mut self, name: &str) -> &'ll BasicBlock {
+        Self::append_block(self.cx, self.llfn(), name)
+    }
+
+    fn switch_to_block(&mut self, llbb: Self::BasicBlock) {
+        *self = Self::build(self.cx, llbb)
+    }
+
+    fn ret_void(&mut self) {
+        unsafe {
+            llvm::LLVMBuildRetVoid(self.llbuilder);
+        }
+    }
+
+    fn ret(&mut self, v: &'ll Value) {
+        unsafe {
+            llvm::LLVMBuildRet(self.llbuilder, v);
+        }
+    }
+
+    fn br(&mut self, dest: &'ll BasicBlock) {
+        unsafe {
+            llvm::LLVMBuildBr(self.llbuilder, dest);
+        }
+    }
+
+    fn cond_br(
+        &mut self,
+        cond: &'ll Value,
+        then_llbb: &'ll BasicBlock,
+        else_llbb: &'ll BasicBlock,
+    ) {
+        unsafe {
+            llvm::LLVMBuildCondBr(self.llbuilder, cond, then_llbb, else_llbb);
+        }
+    }
+
+    fn switch(
+        &mut self,
+        v: &'ll Value,
+        else_llbb: &'ll BasicBlock,
+        cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)>,
+    ) {
+        let switch =
+            unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };
+        for (on_val, dest) in cases {
+            let on_val = self.const_uint_big(self.val_ty(v), on_val);
+            unsafe { llvm::LLVMAddCase(switch, on_val, dest) }
+        }
+    }
+
+    fn invoke(
+        &mut self,
+        llty: &'ll Type,
+        llfn: &'ll Value,
+        args: &[&'ll Value],
+        then: &'ll BasicBlock,
+        catch: &'ll BasicBlock,
+        funclet: Option<&Funclet<'ll>>,
+    ) -> &'ll Value {
+        debug!("invoke {:?} with args ({:?})", llfn, args);
+
+        let args = self.check_call("invoke", llty, llfn, args);
+        let bundle = funclet.map(|funclet| funclet.bundle());
+        let bundle = bundle.as_ref().map(|b| &*b.raw);
+
+        unsafe {
+            llvm::LLVMRustBuildInvoke(
+                self.llbuilder,
+                llty,
+                llfn,
+                args.as_ptr(),
+                args.len() as c_uint,
+                then,
+                catch,
+                bundle,
+                UNNAMED,
+            )
+        }
+    }
+
+    fn unreachable(&mut self) {
+        unsafe {
+            llvm::LLVMBuildUnreachable(self.llbuilder);
+        }
+    }
+
+    builder_methods_for_value_instructions! {
+        add(a, b) => LLVMBuildAdd,
+        fadd(a, b) => LLVMBuildFAdd,
+        sub(a, b) => LLVMBuildSub,
+        fsub(a, b) => LLVMBuildFSub,
+        mul(a, b) => LLVMBuildMul,
+        fmul(a, b) => LLVMBuildFMul,
+        udiv(a, b) => LLVMBuildUDiv,
+        exactudiv(a, b) => LLVMBuildExactUDiv,
+        sdiv(a, b) => LLVMBuildSDiv,
+        exactsdiv(a, b) => LLVMBuildExactSDiv,
+        fdiv(a, b) => LLVMBuildFDiv,
+        urem(a, b) => LLVMBuildURem,
+        srem(a, b) => LLVMBuildSRem,
+        frem(a, b) => LLVMBuildFRem,
+        shl(a, b) => LLVMBuildShl,
+        lshr(a, b) => LLVMBuildLShr,
+        ashr(a, b) => LLVMBuildAShr,
+        and(a, b) => LLVMBuildAnd,
+        or(a, b) => LLVMBuildOr,
+        xor(a, b) => LLVMBuildXor,
+        neg(x) => LLVMBuildNeg,
+        fneg(x) => LLVMBuildFNeg,
+        not(x) => LLVMBuildNot,
+        unchecked_sadd(x, y) => LLVMBuildNSWAdd,
+        unchecked_uadd(x, y) => LLVMBuildNUWAdd,
+        unchecked_ssub(x, y) => LLVMBuildNSWSub,
+        unchecked_usub(x, y) => LLVMBuildNUWSub,
+        unchecked_smul(x, y) => LLVMBuildNSWMul,
+        unchecked_umul(x, y) => LLVMBuildNUWMul,
+    }
+
+    fn fadd_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMBuildFAdd(self.llbuilder, lhs, rhs, UNNAMED);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+
+    fn fsub_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMBuildFSub(self.llbuilder, lhs, rhs, UNNAMED);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+
+    fn fmul_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMBuildFMul(self.llbuilder, lhs, rhs, UNNAMED);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+
+    fn fdiv_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMBuildFDiv(self.llbuilder, lhs, rhs, UNNAMED);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+
+    fn frem_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMBuildFRem(self.llbuilder, lhs, rhs, UNNAMED);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+
+    fn checked_binop(
+        &mut self,
+        oop: OverflowOp,
+        ty: Ty<'_>,
+        lhs: Self::Value,
+        rhs: Self::Value,
+    ) -> (Self::Value, Self::Value) {
+        use rustc_middle::ty::{Int, Uint};
+        use rustc_middle::ty::{IntTy::*, UintTy::*};
+
+        let new_kind = match ty.kind() {
+            Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
+            Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
+            t @ (Uint(_) | Int(_)) => t.clone(),
+            _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
+        };
+
+        let name = match oop {
+            OverflowOp::Add => match new_kind {
+                Int(I8) => "llvm.sadd.with.overflow.i8",
+                Int(I16) => "llvm.sadd.with.overflow.i16",
+                Int(I32) => "llvm.sadd.with.overflow.i32",
+                Int(I64) => "llvm.sadd.with.overflow.i64",
+                Int(I128) => "llvm.sadd.with.overflow.i128",
+
+                Uint(U8) => "llvm.uadd.with.overflow.i8",
+                Uint(U16) => "llvm.uadd.with.overflow.i16",
+                Uint(U32) => "llvm.uadd.with.overflow.i32",
+                Uint(U64) => "llvm.uadd.with.overflow.i64",
+                Uint(U128) => "llvm.uadd.with.overflow.i128",
+
+                _ => unreachable!(),
+            },
+            OverflowOp::Sub => match new_kind {
+                Int(I8) => "llvm.ssub.with.overflow.i8",
+                Int(I16) => "llvm.ssub.with.overflow.i16",
+                Int(I32) => "llvm.ssub.with.overflow.i32",
+                Int(I64) => "llvm.ssub.with.overflow.i64",
+                Int(I128) => "llvm.ssub.with.overflow.i128",
+
+                Uint(U8) => "llvm.usub.with.overflow.i8",
+                Uint(U16) => "llvm.usub.with.overflow.i16",
+                Uint(U32) => "llvm.usub.with.overflow.i32",
+                Uint(U64) => "llvm.usub.with.overflow.i64",
+                Uint(U128) => "llvm.usub.with.overflow.i128",
+
+                _ => unreachable!(),
+            },
+            OverflowOp::Mul => match new_kind {
+                Int(I8) => "llvm.smul.with.overflow.i8",
+                Int(I16) => "llvm.smul.with.overflow.i16",
+                Int(I32) => "llvm.smul.with.overflow.i32",
+                Int(I64) => "llvm.smul.with.overflow.i64",
+                Int(I128) => "llvm.smul.with.overflow.i128",
+
+                Uint(U8) => "llvm.umul.with.overflow.i8",
+                Uint(U16) => "llvm.umul.with.overflow.i16",
+                Uint(U32) => "llvm.umul.with.overflow.i32",
+                Uint(U64) => "llvm.umul.with.overflow.i64",
+                Uint(U128) => "llvm.umul.with.overflow.i128",
+
+                _ => unreachable!(),
+            },
+        };
+
+        let res = self.call_intrinsic(name, &[lhs, rhs]);
+        (self.extract_value(res, 0), self.extract_value(res, 1))
+    }
+
+    fn from_immediate(&mut self, val: Self::Value) -> Self::Value {
+        if self.cx().val_ty(val) == self.cx().type_i1() {
+            self.zext(val, self.cx().type_i8())
+        } else {
+            val
+        }
+    }
+    fn to_immediate_scalar(&mut self, val: Self::Value, scalar: abi::Scalar) -> Self::Value {
+        if scalar.is_bool() {
+            return self.trunc(val, self.cx().type_i1());
+        }
+        val
+    }
+
+    fn alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
+        let mut bx = Builder::with_cx(self.cx);
+        bx.position_at_start(unsafe { llvm::LLVMGetFirstBasicBlock(self.llfn()) });
+        bx.dynamic_alloca(ty, align)
+    }
+
+    fn dynamic_alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
+        unsafe {
+            let alloca = llvm::LLVMBuildAlloca(self.llbuilder, ty, UNNAMED);
+            llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
+            alloca
+        }
+    }
+
+    fn array_alloca(&mut self, ty: &'ll Type, len: &'ll Value, align: Align) -> &'ll Value {
+        unsafe {
+            let alloca = llvm::LLVMBuildArrayAlloca(self.llbuilder, ty, len, UNNAMED);
+            llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
+            alloca
+        }
+    }
+
+    fn load(&mut self, ty: &'ll Type, ptr: &'ll Value, align: Align) -> &'ll Value {
+        unsafe {
+            let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
+            llvm::LLVMSetAlignment(load, align.bytes() as c_uint);
+            load
+        }
+    }
+
+    fn volatile_load(&mut self, ty: &'ll Type, ptr: &'ll Value) -> &'ll Value {
+        unsafe {
+            let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
+            llvm::LLVMSetVolatile(load, llvm::True);
+            load
+        }
+    }
+
+    fn atomic_load(
+        &mut self,
+        ty: &'ll Type,
+        ptr: &'ll Value,
+        order: rustc_codegen_ssa::common::AtomicOrdering,
+        size: Size,
+    ) -> &'ll Value {
+        unsafe {
+            let load = llvm::LLVMRustBuildAtomicLoad(
+                self.llbuilder,
+                ty,
+                ptr,
+                UNNAMED,
+                AtomicOrdering::from_generic(order),
+            );
+            // LLVM requires the alignment of atomic loads to be at least the size of the type.
+            llvm::LLVMSetAlignment(load, size.bytes() as c_uint);
+            load
+        }
+    }
+
+    #[instrument(level = "trace", skip(self))]
+    fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
+        assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
+
+        if place.layout.is_zst() {
+            return OperandRef::new_zst(self, place.layout);
+        }
+
+        #[instrument(level = "trace", skip(bx))]
+        fn scalar_load_metadata<'a, 'll, 'tcx>(
+            bx: &mut Builder<'a, 'll, 'tcx>,
+            load: &'ll Value,
+            scalar: abi::Scalar,
+            layout: TyAndLayout<'tcx>,
+            offset: Size,
+        ) {
+            if !scalar.is_always_valid(bx) {
+                bx.noundef_metadata(load);
+            }
+
+            match scalar.primitive() {
+                abi::Int(..) => {
+                    if !scalar.is_always_valid(bx) {
+                        bx.range_metadata(load, scalar.valid_range(bx));
+                    }
+                }
+                abi::Pointer => {
+                    if !scalar.valid_range(bx).contains(0) {
+                        bx.nonnull_metadata(load);
+                    }
+
+                    if let Some(pointee) = layout.pointee_info_at(bx, offset) {
+                        if let Some(_) = pointee.safe {
+                            bx.align_metadata(load, pointee.align);
+                        }
+                    }
+                }
+                abi::F32 | abi::F64 => {}
+            }
+        }
+
+        let val = if let Some(llextra) = place.llextra {
+            OperandValue::Ref(place.llval, Some(llextra), place.align)
+        } else if place.layout.is_llvm_immediate() {
+            let mut const_llval = None;
+            let llty = place.layout.llvm_type(self);
+            unsafe {
+                if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
+                    if llvm::LLVMIsGlobalConstant(global) == llvm::True {
+                        if let Some(init) = llvm::LLVMGetInitializer(global) {
+                            if self.val_ty(init) == llty {
+                                const_llval = Some(init);
+                            }
+                        }
+                    }
+                }
+            }
+            let llval = const_llval.unwrap_or_else(|| {
+                let load = self.load(llty, place.llval, place.align);
+                if let abi::Abi::Scalar(scalar) = place.layout.abi {
+                    scalar_load_metadata(self, load, scalar, place.layout, Size::ZERO);
+                }
+                load
+            });
+            OperandValue::Immediate(self.to_immediate(llval, place.layout))
+        } else if let abi::Abi::ScalarPair(a, b) = place.layout.abi {
+            let b_offset = a.size(self).align_to(b.align(self).abi);
+            let pair_ty = place.layout.llvm_type(self);
+
+            let mut load = |i, scalar: abi::Scalar, layout, align, offset| {
+                let llptr = self.struct_gep(pair_ty, place.llval, i as u64);
+                let llty = place.layout.scalar_pair_element_llvm_type(self, i, false);
+                let load = self.load(llty, llptr, align);
+                scalar_load_metadata(self, load, scalar, layout, offset);
+                self.to_immediate_scalar(load, scalar)
+            };
+
+            OperandValue::Pair(
+                load(0, a, place.layout, place.align, Size::ZERO),
+                load(1, b, place.layout, place.align.restrict_for_offset(b_offset), b_offset),
+            )
+        } else {
+            OperandValue::Ref(place.llval, None, place.align)
+        };
+
+        OperandRef { val, layout: place.layout }
+    }
+
+    fn write_operand_repeatedly(
+        mut self,
+        cg_elem: OperandRef<'tcx, &'ll Value>,
+        count: u64,
+        dest: PlaceRef<'tcx, &'ll Value>,
+    ) -> Self {
+        let zero = self.const_usize(0);
+        let count = self.const_usize(count);
+        let start = dest.project_index(&mut self, zero).llval;
+        let end = dest.project_index(&mut self, count).llval;
+
+        let header_bb = self.append_sibling_block("repeat_loop_header");
+        let body_bb = self.append_sibling_block("repeat_loop_body");
+        let next_bb = self.append_sibling_block("repeat_loop_next");
+
+        self.br(header_bb);
+
+        let mut header_bx = Self::build(self.cx, header_bb);
+        let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
+
+        let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
+        header_bx.cond_br(keep_going, body_bb, next_bb);
+
+        let mut body_bx = Self::build(self.cx, body_bb);
+        let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
+        cg_elem
+            .val
+            .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
+
+        let next = body_bx.inbounds_gep(
+            self.backend_type(cg_elem.layout),
+            current,
+            &[self.const_usize(1)],
+        );
+        body_bx.br(header_bb);
+        header_bx.add_incoming_to_phi(current, next, body_bb);
+
+        Self::build(self.cx, next_bb)
+    }
+
+    fn range_metadata(&mut self, load: &'ll Value, range: WrappingRange) {
+        if self.sess().target.arch == "amdgpu" {
+            // amdgpu/LLVM does something weird and thinks an i64 value is
+            // split into a v2i32, halving the bitwidth LLVM expects,
+            // tripping an assertion. So, for now, just disable this
+            // optimization.
+            return;
+        }
+
+        unsafe {
+            let llty = self.cx.val_ty(load);
+            let v = [
+                self.cx.const_uint_big(llty, range.start),
+                self.cx.const_uint_big(llty, range.end.wrapping_add(1)),
+            ];
+
+            llvm::LLVMSetMetadata(
+                load,
+                llvm::MD_range as c_uint,
+                llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
+            );
+        }
+    }
+
+    fn nonnull_metadata(&mut self, load: &'ll Value) {
+        unsafe {
+            llvm::LLVMSetMetadata(
+                load,
+                llvm::MD_nonnull as c_uint,
+                llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
+            );
+        }
+    }
+
+    fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
+        self.store_with_flags(val, ptr, align, MemFlags::empty())
+    }
+
+    fn store_with_flags(
+        &mut self,
+        val: &'ll Value,
+        ptr: &'ll Value,
+        align: Align,
+        flags: MemFlags,
+    ) -> &'ll Value {
+        debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
+        let ptr = self.check_store(val, ptr);
+        unsafe {
+            let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
+            let align =
+                if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
+            llvm::LLVMSetAlignment(store, align);
+            if flags.contains(MemFlags::VOLATILE) {
+                llvm::LLVMSetVolatile(store, llvm::True);
+            }
+            if flags.contains(MemFlags::NONTEMPORAL) {
+                // According to LLVM [1] building a nontemporal store must
+                // *always* point to a metadata value of the integer 1.
+                //
+                // [1]: https://llvm.org/docs/LangRef.html#store-instruction
+                let one = self.cx.const_i32(1);
+                let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
+                llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
+            }
+            store
+        }
+    }
+
+    fn atomic_store(
+        &mut self,
+        val: &'ll Value,
+        ptr: &'ll Value,
+        order: rustc_codegen_ssa::common::AtomicOrdering,
+        size: Size,
+    ) {
+        debug!("Store {:?} -> {:?}", val, ptr);
+        let ptr = self.check_store(val, ptr);
+        unsafe {
+            let store = llvm::LLVMRustBuildAtomicStore(
+                self.llbuilder,
+                val,
+                ptr,
+                AtomicOrdering::from_generic(order),
+            );
+            // LLVM requires the alignment of atomic stores to be at least the size of the type.
+            llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
+        }
+    }
+
+    fn gep(&mut self, ty: &'ll Type, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
+        unsafe {
+            llvm::LLVMBuildGEP2(
+                self.llbuilder,
+                ty,
+                ptr,
+                indices.as_ptr(),
+                indices.len() as c_uint,
+                UNNAMED,
+            )
+        }
+    }
+
+    fn inbounds_gep(
+        &mut self,
+        ty: &'ll Type,
+        ptr: &'ll Value,
+        indices: &[&'ll Value],
+    ) -> &'ll Value {
+        unsafe {
+            llvm::LLVMBuildInBoundsGEP2(
+                self.llbuilder,
+                ty,
+                ptr,
+                indices.as_ptr(),
+                indices.len() as c_uint,
+                UNNAMED,
+            )
+        }
+    }
+
+    fn struct_gep(&mut self, ty: &'ll Type, ptr: &'ll Value, idx: u64) -> &'ll Value {
+        assert_eq!(idx as c_uint as u64, idx);
+        unsafe { llvm::LLVMBuildStructGEP2(self.llbuilder, ty, ptr, idx as c_uint, UNNAMED) }
+    }
+
+    /* Casts */
+    fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn fptoui_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
+        self.fptoint_sat(false, val, dest_ty)
+    }
+
+    fn fptosi_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
+        self.fptoint_sat(true, val, dest_ty)
+    }
+
+    fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        // On WebAssembly the `fptoui` and `fptosi` instructions currently have
+        // poor codegen. The reason for this is that the corresponding wasm
+        // instructions, `i32.trunc_f32_s` for example, will trap when the float
+        // is out-of-bounds, infinity, or nan. This means that LLVM
+        // automatically inserts control flow around `fptoui` and `fptosi`
+        // because the LLVM instruction `fptoui` is defined as producing a
+        // poison value, not having UB on out-of-bounds values.
+        //
+        // This method, however, is only used with non-saturating casts that
+        // have UB on out-of-bounds values. This means that it's ok if we use
+        // the raw wasm instruction since out-of-bounds values can do whatever
+        // we like. To ensure that LLVM picks the right instruction we choose
+        // the raw wasm intrinsic functions which avoid LLVM inserting all the
+        // other control flow automatically.
+        if self.sess().target.is_like_wasm {
+            let src_ty = self.cx.val_ty(val);
+            if self.cx.type_kind(src_ty) != TypeKind::Vector {
+                let float_width = self.cx.float_width(src_ty);
+                let int_width = self.cx.int_width(dest_ty);
+                let name = match (int_width, float_width) {
+                    (32, 32) => Some("llvm.wasm.trunc.unsigned.i32.f32"),
+                    (32, 64) => Some("llvm.wasm.trunc.unsigned.i32.f64"),
+                    (64, 32) => Some("llvm.wasm.trunc.unsigned.i64.f32"),
+                    (64, 64) => Some("llvm.wasm.trunc.unsigned.i64.f64"),
+                    _ => None,
+                };
+                if let Some(name) = name {
+                    return self.call_intrinsic(name, &[val]);
+                }
+            }
+        }
+        unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        // see `fptoui` above for why wasm is different here
+        if self.sess().target.is_like_wasm {
+            let src_ty = self.cx.val_ty(val);
+            if self.cx.type_kind(src_ty) != TypeKind::Vector {
+                let float_width = self.cx.float_width(src_ty);
+                let int_width = self.cx.int_width(dest_ty);
+                let name = match (int_width, float_width) {
+                    (32, 32) => Some("llvm.wasm.trunc.signed.i32.f32"),
+                    (32, 64) => Some("llvm.wasm.trunc.signed.i32.f64"),
+                    (64, 32) => Some("llvm.wasm.trunc.signed.i64.f32"),
+                    (64, 64) => Some("llvm.wasm.trunc.signed.i64.f64"),
+                    _ => None,
+                };
+                if let Some(name) = name {
+                    return self.call_intrinsic(name, &[val]);
+                }
+            }
+        }
+        unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
+    }
+
+    fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    /* Comparisons */
+    fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        let op = llvm::IntPredicate::from_generic(op);
+        unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
+    }
+
+    fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        let op = llvm::RealPredicate::from_generic(op);
+        unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
+    }
+
+    /* Miscellaneous instructions */
+    fn memcpy(
+        &mut self,
+        dst: &'ll Value,
+        dst_align: Align,
+        src: &'ll Value,
+        src_align: Align,
+        size: &'ll Value,
+        flags: MemFlags,
+    ) {
+        assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
+        let size = self.intcast(size, self.type_isize(), false);
+        let is_volatile = flags.contains(MemFlags::VOLATILE);
+        let dst = self.pointercast(dst, self.type_i8p());
+        let src = self.pointercast(src, self.type_i8p());
+        unsafe {
+            llvm::LLVMRustBuildMemCpy(
+                self.llbuilder,
+                dst,
+                dst_align.bytes() as c_uint,
+                src,
+                src_align.bytes() as c_uint,
+                size,
+                is_volatile,
+            );
+        }
+    }
+
+    fn memmove(
+        &mut self,
+        dst: &'ll Value,
+        dst_align: Align,
+        src: &'ll Value,
+        src_align: Align,
+        size: &'ll Value,
+        flags: MemFlags,
+    ) {
+        assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memmove not supported");
+        let size = self.intcast(size, self.type_isize(), false);
+        let is_volatile = flags.contains(MemFlags::VOLATILE);
+        let dst = self.pointercast(dst, self.type_i8p());
+        let src = self.pointercast(src, self.type_i8p());
+        unsafe {
+            llvm::LLVMRustBuildMemMove(
+                self.llbuilder,
+                dst,
+                dst_align.bytes() as c_uint,
+                src,
+                src_align.bytes() as c_uint,
+                size,
+                is_volatile,
+            );
+        }
+    }
+
+    fn memset(
+        &mut self,
+        ptr: &'ll Value,
+        fill_byte: &'ll Value,
+        size: &'ll Value,
+        align: Align,
+        flags: MemFlags,
+    ) {
+        let is_volatile = flags.contains(MemFlags::VOLATILE);
+        let ptr = self.pointercast(ptr, self.type_i8p());
+        unsafe {
+            llvm::LLVMRustBuildMemSet(
+                self.llbuilder,
+                ptr,
+                align.bytes() as c_uint,
+                fill_byte,
+                size,
+                is_volatile,
+            );
+        }
+    }
+
+    fn select(
+        &mut self,
+        cond: &'ll Value,
+        then_val: &'ll Value,
+        else_val: &'ll Value,
+    ) -> &'ll Value {
+        unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
+    }
+
+    fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
+    }
+
+    fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
+    }
+
+    fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
+        unsafe {
+            let elt_ty = self.cx.val_ty(elt);
+            let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
+            let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
+            let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
+            self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
+        }
+    }
+
+    fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
+        assert_eq!(idx as c_uint as u64, idx);
+        unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
+    }
+
+    fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
+        assert_eq!(idx as c_uint as u64, idx);
+        unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
+    }
+
+    fn set_personality_fn(&mut self, personality: &'ll Value) {
+        unsafe {
+            llvm::LLVMSetPersonalityFn(self.llfn(), personality);
+        }
+    }
+
+    fn cleanup_landing_pad(&mut self, ty: &'ll Type, pers_fn: &'ll Value) -> &'ll Value {
+        let landing_pad = self.landing_pad(ty, pers_fn, 1 /* FIXME should this be 0? */);
+        unsafe {
+            llvm::LLVMSetCleanup(landing_pad, llvm::True);
+        }
+        landing_pad
+    }
+
+    fn resume(&mut self, exn: &'ll Value) {
+        unsafe {
+            llvm::LLVMBuildResume(self.llbuilder, exn);
+        }
+    }
+
+    fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
+        let name = cstr!("cleanuppad");
+        let ret = unsafe {
+            llvm::LLVMRustBuildCleanupPad(
+                self.llbuilder,
+                parent,
+                args.len() as c_uint,
+                args.as_ptr(),
+                name.as_ptr(),
+            )
+        };
+        Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
+    }
+
+    fn cleanup_ret(&mut self, funclet: &Funclet<'ll>, unwind: Option<&'ll BasicBlock>) {
+        unsafe {
+            llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind)
+                .expect("LLVM does not have support for cleanupret");
+        }
+    }
+
+    fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
+        let name = cstr!("catchpad");
+        let ret = unsafe {
+            llvm::LLVMRustBuildCatchPad(
+                self.llbuilder,
+                parent,
+                args.len() as c_uint,
+                args.as_ptr(),
+                name.as_ptr(),
+            )
+        };
+        Funclet::new(ret.expect("LLVM does not have support for catchpad"))
+    }
+
+    fn catch_switch(
+        &mut self,
+        parent: Option<&'ll Value>,
+        unwind: Option<&'ll BasicBlock>,
+        handlers: &[&'ll BasicBlock],
+    ) -> &'ll Value {
+        let name = cstr!("catchswitch");
+        let ret = unsafe {
+            llvm::LLVMRustBuildCatchSwitch(
+                self.llbuilder,
+                parent,
+                unwind,
+                handlers.len() as c_uint,
+                name.as_ptr(),
+            )
+        };
+        let ret = ret.expect("LLVM does not have support for catchswitch");
+        for handler in handlers {
+            unsafe {
+                llvm::LLVMRustAddHandler(ret, handler);
+            }
+        }
+        ret
+    }
+
+    // Atomic Operations
+    fn atomic_cmpxchg(
+        &mut self,
+        dst: &'ll Value,
+        cmp: &'ll Value,
+        src: &'ll Value,
+        mut order: rustc_codegen_ssa::common::AtomicOrdering,
+        failure_order: rustc_codegen_ssa::common::AtomicOrdering,
+        weak: bool,
+    ) -> &'ll Value {
+        let weak = if weak { llvm::True } else { llvm::False };
+        if llvm_util::get_version() < (13, 0, 0) {
+            use rustc_codegen_ssa::common::AtomicOrdering::*;
+            // Older llvm has the pre-C++17 restriction on
+            // success and failure memory ordering,
+            // requiring the former to be at least as strong as the latter.
+            // So, for llvm 12, we upgrade the success ordering to a stronger
+            // one if necessary.
+            match (order, failure_order) {
+                (Relaxed, Acquire) => order = Acquire,
+                (Release, Acquire) => order = AcquireRelease,
+                (_, SequentiallyConsistent) => order = SequentiallyConsistent,
+                _ => {}
+            }
+        }
+        unsafe {
+            llvm::LLVMRustBuildAtomicCmpXchg(
+                self.llbuilder,
+                dst,
+                cmp,
+                src,
+                AtomicOrdering::from_generic(order),
+                AtomicOrdering::from_generic(failure_order),
+                weak,
+            )
+        }
+    }
+    fn atomic_rmw(
+        &mut self,
+        op: rustc_codegen_ssa::common::AtomicRmwBinOp,
+        dst: &'ll Value,
+        src: &'ll Value,
+        order: rustc_codegen_ssa::common::AtomicOrdering,
+    ) -> &'ll Value {
+        unsafe {
+            llvm::LLVMBuildAtomicRMW(
+                self.llbuilder,
+                AtomicRmwBinOp::from_generic(op),
+                dst,
+                src,
+                AtomicOrdering::from_generic(order),
+                False,
+            )
+        }
+    }
+
+    fn atomic_fence(
+        &mut self,
+        order: rustc_codegen_ssa::common::AtomicOrdering,
+        scope: rustc_codegen_ssa::common::SynchronizationScope,
+    ) {
+        unsafe {
+            llvm::LLVMRustBuildAtomicFence(
+                self.llbuilder,
+                AtomicOrdering::from_generic(order),
+                SynchronizationScope::from_generic(scope),
+            );
+        }
+    }
+
+    fn set_invariant_load(&mut self, load: &'ll Value) {
+        unsafe {
+            llvm::LLVMSetMetadata(
+                load,
+                llvm::MD_invariant_load as c_uint,
+                llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
+            );
+        }
+    }
+
+    fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
+        self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
+    }
+
+    fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
+        self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
+    }
+
+    fn instrprof_increment(
+        &mut self,
+        fn_name: &'ll Value,
+        hash: &'ll Value,
+        num_counters: &'ll Value,
+        index: &'ll Value,
+    ) {
+        debug!(
+            "instrprof_increment() with args ({:?}, {:?}, {:?}, {:?})",
+            fn_name, hash, num_counters, index
+        );
+
+        let llfn = unsafe { llvm::LLVMRustGetInstrProfIncrementIntrinsic(self.cx().llmod) };
+        let llty = self.cx.type_func(
+            &[self.cx.type_i8p(), self.cx.type_i64(), self.cx.type_i32(), self.cx.type_i32()],
+            self.cx.type_void(),
+        );
+        let args = &[fn_name, hash, num_counters, index];
+        let args = self.check_call("call", llty, llfn, args);
+
+        unsafe {
+            let _ = llvm::LLVMRustBuildCall(
+                self.llbuilder,
+                llty,
+                llfn,
+                args.as_ptr() as *const &llvm::Value,
+                args.len() as c_uint,
+                None,
+            );
+        }
+    }
+
+    fn call(
+        &mut self,
+        llty: &'ll Type,
+        llfn: &'ll Value,
+        args: &[&'ll Value],
+        funclet: Option<&Funclet<'ll>>,
+    ) -> &'ll Value {
+        debug!("call {:?} with args ({:?})", llfn, args);
+
+        let args = self.check_call("call", llty, llfn, args);
+        let bundle = funclet.map(|funclet| funclet.bundle());
+        let bundle = bundle.as_ref().map(|b| &*b.raw);
+
+        unsafe {
+            llvm::LLVMRustBuildCall(
+                self.llbuilder,
+                llty,
+                llfn,
+                args.as_ptr() as *const &llvm::Value,
+                args.len() as c_uint,
+                bundle,
+            )
+        }
+    }
+
+    fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
+    }
+
+    fn do_not_inline(&mut self, llret: &'ll Value) {
+        let noinline = llvm::AttributeKind::NoInline.create_attr(self.llcx);
+        attributes::apply_to_callsite(llret, llvm::AttributePlace::Function, &[noinline]);
+    }
+}
+
+impl<'ll> StaticBuilderMethods for Builder<'_, 'll, '_> {
+    fn get_static(&mut self, def_id: DefId) -> &'ll Value {
+        // Forward to the `get_static` method of `CodegenCx`
+        self.cx().get_static(def_id)
+    }
+}
+
+impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
+    fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
+        // Create a fresh builder from the crate context.
+        let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
+        Builder { llbuilder, cx }
+    }
+
+    pub fn llfn(&self) -> &'ll Value {
+        unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
+    }
+
+    fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
+        unsafe {
+            llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
+        }
+    }
+
+    fn align_metadata(&mut self, load: &'ll Value, align: Align) {
+        unsafe {
+            let v = [self.cx.const_u64(align.bytes())];
+
+            llvm::LLVMSetMetadata(
+                load,
+                llvm::MD_align as c_uint,
+                llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
+            );
+        }
+    }
+
+    fn noundef_metadata(&mut self, load: &'ll Value) {
+        unsafe {
+            llvm::LLVMSetMetadata(
+                load,
+                llvm::MD_noundef as c_uint,
+                llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
+            );
+        }
+    }
+
+    pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
+    }
+
+    pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
+    }
+
+    pub fn insert_element(
+        &mut self,
+        vec: &'ll Value,
+        elt: &'ll Value,
+        idx: &'ll Value,
+    ) -> &'ll Value {
+        unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
+    }
+
+    pub fn shuffle_vector(
+        &mut self,
+        v1: &'ll Value,
+        v2: &'ll Value,
+        mask: &'ll Value,
+    ) -> &'ll Value {
+        unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
+    }
+
+    pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
+    }
+    pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
+    }
+    pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+    pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+    pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
+    }
+    pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
+    }
+    pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
+    }
+    pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
+    }
+    pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
+    }
+    pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
+        }
+    }
+    pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
+        }
+    }
+    pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr =
+                llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+    pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
+        unsafe {
+            let instr =
+                llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
+            llvm::LLVMRustSetFastMath(instr);
+            instr
+        }
+    }
+    pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
+    }
+    pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
+        unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
+    }
+
+    pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
+        unsafe {
+            llvm::LLVMAddClause(landing_pad, clause);
+        }
+    }
+
+    pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
+        let ret =
+            unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
+        ret.expect("LLVM does not have support for catchret")
+    }
+
+    fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
+        let dest_ptr_ty = self.cx.val_ty(ptr);
+        let stored_ty = self.cx.val_ty(val);
+        let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
+
+        assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
+
+        if dest_ptr_ty == stored_ptr_ty {
+            ptr
+        } else {
+            debug!(
+                "type mismatch in store. \
+                    Expected {:?}, got {:?}; inserting bitcast",
+                dest_ptr_ty, stored_ptr_ty
+            );
+            self.bitcast(ptr, stored_ptr_ty)
+        }
+    }
+
+    fn check_call<'b>(
+        &mut self,
+        typ: &str,
+        fn_ty: &'ll Type,
+        llfn: &'ll Value,
+        args: &'b [&'ll Value],
+    ) -> Cow<'b, [&'ll Value]> {
+        assert!(
+            self.cx.type_kind(fn_ty) == TypeKind::Function,
+            "builder::{} not passed a function, but {:?}",
+            typ,
+            fn_ty
+        );
+
+        let param_tys = self.cx.func_params_types(fn_ty);
+
+        let all_args_match = iter::zip(&param_tys, args.iter().map(|&v| self.val_ty(v)))
+            .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
+
+        if all_args_match {
+            return Cow::Borrowed(args);
+        }
+
+        let casted_args: Vec<_> = iter::zip(param_tys, args)
+            .enumerate()
+            .map(|(i, (expected_ty, &actual_val))| {
+                let actual_ty = self.val_ty(actual_val);
+                if expected_ty != actual_ty {
+                    debug!(
+                        "type mismatch in function call of {:?}. \
+                            Expected {:?} for param {}, got {:?}; injecting bitcast",
+                        llfn, expected_ty, i, actual_ty
+                    );
+                    self.bitcast(actual_val, expected_ty)
+                } else {
+                    actual_val
+                }
+            })
+            .collect();
+
+        Cow::Owned(casted_args)
+    }
+
+    pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
+        unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
+    }
+
+    pub(crate) fn call_intrinsic(&mut self, intrinsic: &str, args: &[&'ll Value]) -> &'ll Value {
+        let (ty, f) = self.cx.get_intrinsic(intrinsic);
+        self.call(ty, f, args, None)
+    }
+
+    fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
+        let size = size.bytes();
+        if size == 0 {
+            return;
+        }
+
+        if !self.cx().sess().emit_lifetime_markers() {
+            return;
+        }
+
+        let ptr = self.pointercast(ptr, self.cx.type_i8p());
+        self.call_intrinsic(intrinsic, &[self.cx.const_u64(size), ptr]);
+    }
+
+    pub(crate) fn phi(
+        &mut self,
+        ty: &'ll Type,
+        vals: &[&'ll Value],
+        bbs: &[&'ll BasicBlock],
+    ) -> &'ll Value {
+        assert_eq!(vals.len(), bbs.len());
+        let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
+        unsafe {
+            llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
+            phi
+        }
+    }
+
+    fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
+        unsafe {
+            llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
+        }
+    }
+
+    fn fptoint_sat_broken_in_llvm(&self) -> bool {
+        match self.tcx.sess.target.arch.as_ref() {
+            // FIXME - https://bugs.llvm.org/show_bug.cgi?id=50083
+            "riscv64" => llvm_util::get_version() < (13, 0, 0),
+            _ => false,
+        }
+    }
+
+    fn fptoint_sat(
+        &mut self,
+        signed: bool,
+        val: &'ll Value,
+        dest_ty: &'ll Type,
+    ) -> Option<&'ll Value> {
+        if !self.fptoint_sat_broken_in_llvm() {
+            let src_ty = self.cx.val_ty(val);
+            let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector
+            {
+                assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
+                (
+                    self.cx.element_type(src_ty),
+                    self.cx.element_type(dest_ty),
+                    Some(self.cx.vector_length(src_ty)),
+                )
+            } else {
+                (src_ty, dest_ty, None)
+            };
+            let float_width = self.cx.float_width(float_ty);
+            let int_width = self.cx.int_width(int_ty);
+
+            let instr = if signed { "fptosi" } else { "fptoui" };
+            let name = if let Some(vector_length) = vector_length {
+                format!(
+                    "llvm.{}.sat.v{}i{}.v{}f{}",
+                    instr, vector_length, int_width, vector_length, float_width
+                )
+            } else {
+                format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
+            };
+            let f =
+                self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
+            Some(self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None))
+        } else {
+            None
+        }
+    }
+
+    pub(crate) fn landing_pad(
+        &mut self,
+        ty: &'ll Type,
+        pers_fn: &'ll Value,
+        num_clauses: usize,
+    ) -> &'ll Value {
+        // Use LLVMSetPersonalityFn to set the personality. It supports arbitrary Consts while,
+        // LLVMBuildLandingPad requires the argument to be a Function (as of LLVM 12). The
+        // personality lives on the parent function anyway.
+        self.set_personality_fn(pers_fn);
+        unsafe {
+            llvm::LLVMBuildLandingPad(self.llbuilder, ty, None, num_clauses as c_uint, UNNAMED)
+        }
+    }
+}