FunctionBlock

    pub const FunctionBlock = struct {
        pub const id: BlockId = .FUNCTION;

        pub const abbrevs = [_]type{
            ModuleBlock.FunctionBlock.DeclareBlocks,
            ModuleBlock.FunctionBlock.Call,
            ModuleBlock.FunctionBlock.CallFast,
            ModuleBlock.FunctionBlock.FNeg,
            ModuleBlock.FunctionBlock.FNegFast,
            ModuleBlock.FunctionBlock.Binary,
            ModuleBlock.FunctionBlock.BinaryNoWrap,
            ModuleBlock.FunctionBlock.BinaryExact,
            ModuleBlock.FunctionBlock.BinaryFast,
            ModuleBlock.FunctionBlock.Cmp,
            ModuleBlock.FunctionBlock.CmpFast,
            ModuleBlock.FunctionBlock.Select,
            ModuleBlock.FunctionBlock.SelectFast,
            ModuleBlock.FunctionBlock.Cast,
            ModuleBlock.FunctionBlock.TruncNoWrap,
            ModuleBlock.FunctionBlock.Alloca,
            ModuleBlock.FunctionBlock.GetElementPtr,
            ModuleBlock.FunctionBlock.ExtractValue,
            ModuleBlock.FunctionBlock.InsertValue,
            ModuleBlock.FunctionBlock.ExtractElement,
            ModuleBlock.FunctionBlock.InsertElement,
            ModuleBlock.FunctionBlock.ShuffleVector,
            ModuleBlock.FunctionBlock.RetVoid,
            ModuleBlock.FunctionBlock.Ret,
            ModuleBlock.FunctionBlock.Unreachable,
            ModuleBlock.FunctionBlock.Load,
            ModuleBlock.FunctionBlock.LoadAtomic,
            ModuleBlock.FunctionBlock.Store,
            ModuleBlock.FunctionBlock.StoreAtomic,
            ModuleBlock.FunctionBlock.BrUnconditional,
            ModuleBlock.FunctionBlock.BrConditional,
            ModuleBlock.FunctionBlock.VaArg,
            ModuleBlock.FunctionBlock.AtomicRmw,
            ModuleBlock.FunctionBlock.CmpXchg,
            ModuleBlock.FunctionBlock.Fence,
            ModuleBlock.FunctionBlock.DebugLoc,
            ModuleBlock.FunctionBlock.DebugLocAgain,
            ModuleBlock.FunctionBlock.ColdOperandBundle,
            ModuleBlock.FunctionBlock.IndirectBr,
        };

        pub const Code = enum(u7) {
            /// DECLAREBLOCKS: [n]
            DECLAREBLOCKS = 1,

            /// BINOP:      [opcode, ty, opval, opval]
            INST_BINOP = 2,
            /// CAST:       [opcode, ty, opty, opval]
            INST_CAST = 3,
            /// GEP:        [n x operands]
            INST_GEP_OLD = 4,
            /// SELECT:     [ty, opval, opval, opval]
            INST_SELECT = 5,
            /// EXTRACTELT: [opty, opval, opval]
            INST_EXTRACTELT = 6,
            /// INSERTELT:  [ty, opval, opval, opval]
            INST_INSERTELT = 7,
            /// SHUFFLEVEC: [ty, opval, opval, opval]
            INST_SHUFFLEVEC = 8,
            /// CMP:        [opty, opval, opval, pred]
            INST_CMP = 9,

            /// RET:        [opty,opval<both optional>]
            INST_RET = 10,
            /// BR:         [bb#, bb#, cond] or [bb#]
            INST_BR = 11,
            /// SWITCH:     [opty, op0, op1, ...]
            INST_SWITCH = 12,
            /// INVOKE:     [attr, fnty, op0,op1, ...]
            INST_INVOKE = 13,
            /// UNREACHABLE
            INST_UNREACHABLE = 15,

            /// PHI:        [ty, val0,bb0, ...]
            INST_PHI = 16,
            /// ALLOCA:     [instty, opty, op, align]
            INST_ALLOCA = 19,
            /// LOAD:       [opty, op, align, vol]
            INST_LOAD = 20,
            /// VAARG:      [valistty, valist, instty]
            /// This store code encodes the pointer type, rather than the value type
            /// this is so information only available in the pointer type (e.g. address
            /// spaces) is retained.
            INST_VAARG = 23,
            /// STORE:      [ptrty,ptr,val, align, vol]
            INST_STORE_OLD = 24,

            /// EXTRACTVAL: [n x operands]
            INST_EXTRACTVAL = 26,
            /// INSERTVAL:  [n x operands]
            INST_INSERTVAL = 27,
            /// fcmp/icmp returning Int1TY or vector of Int1Ty. Same as CMP, exists to
            /// support legacy vicmp/vfcmp instructions.
            /// CMP2:       [opty, opval, opval, pred]
            INST_CMP2 = 28,
            /// new select on i1 or [N x i1]
            /// VSELECT:    [ty,opval,opval,predty,pred]
            INST_VSELECT = 29,
            /// INBOUNDS_GEP: [n x operands]
            INST_INBOUNDS_GEP_OLD = 30,
            /// INDIRECTBR: [opty, op0, op1, ...]
            INST_INDIRECTBR = 31,

            /// DEBUG_LOC_AGAIN
            DEBUG_LOC_AGAIN = 33,

            /// CALL:    [attr, cc, fnty, fnid, args...]
            INST_CALL = 34,

            /// DEBUG_LOC:  [Line,Col,ScopeVal, IAVal]
            DEBUG_LOC = 35,
            /// FENCE: [ordering, synchscope]
            INST_FENCE = 36,
            /// CMPXCHG: [ptrty, ptr, cmp, val, vol,
            ///            ordering, synchscope,
            ///            failure_ordering?, weak?]
            INST_CMPXCHG_OLD = 37,
            /// ATOMICRMW: [ptrty,ptr,val, operation,
            ///             align, vol,
            ///             ordering, synchscope]
            INST_ATOMICRMW_OLD = 38,
            /// RESUME:     [opval]
            INST_RESUME = 39,
            /// LANDINGPAD: [ty,val,val,num,id0,val0...]
            INST_LANDINGPAD_OLD = 40,
            /// LOAD: [opty, op, align, vol,
            ///        ordering, synchscope]
            INST_LOADATOMIC = 41,
            /// STORE: [ptrty,ptr,val, align, vol
            ///         ordering, synchscope]
            INST_STOREATOMIC_OLD = 42,

            /// GEP:  [inbounds, n x operands]
            INST_GEP = 43,
            /// STORE: [ptrty,ptr,valty,val, align, vol]
            INST_STORE = 44,
            /// STORE: [ptrty,ptr,val, align, vol
            INST_STOREATOMIC = 45,
            /// CMPXCHG: [ptrty, ptr, cmp, val, vol,
            ///           success_ordering, synchscope,
            ///           failure_ordering, weak]
            INST_CMPXCHG = 46,
            /// LANDINGPAD: [ty,val,num,id0,val0...]
            INST_LANDINGPAD = 47,
            /// CLEANUPRET: [val] or [val,bb#]
            INST_CLEANUPRET = 48,
            /// CATCHRET: [val,bb#]
            INST_CATCHRET = 49,
            /// CATCHPAD: [bb#,bb#,num,args...]
            INST_CATCHPAD = 50,
            /// CLEANUPPAD: [num,args...]
            INST_CLEANUPPAD = 51,
            /// CATCHSWITCH: [num,args...] or [num,args...,bb]
            INST_CATCHSWITCH = 52,
            /// OPERAND_BUNDLE: [tag#, value...]
            OPERAND_BUNDLE = 55,
            /// UNOP:       [opcode, ty, opval]
            INST_UNOP = 56,
            /// CALLBR:     [attr, cc, norm, transfs,
            ///              fnty, fnid, args...]
            INST_CALLBR = 57,
            /// FREEZE: [opty, opval]
            INST_FREEZE = 58,
            /// ATOMICRMW: [ptrty, ptr, valty, val,
            ///             operation, align, vol,
            ///             ordering, synchscope]
            INST_ATOMICRMW = 59,
            /// BLOCKADDR_USERS: [value...]
            BLOCKADDR_USERS = 60,

            /// [DILocation, DILocalVariable, DIExpression, ValueAsMetadata]
            DEBUG_RECORD_VALUE = 61,
            /// [DILocation, DILocalVariable, DIExpression, ValueAsMetadata]
            DEBUG_RECORD_DECLARE = 62,
            /// [DILocation, DILocalVariable, DIExpression, ValueAsMetadata,
            ///  DIAssignID, DIExpression (addr), ValueAsMetadata (addr)]
            DEBUG_RECORD_ASSIGN = 63,
            /// [DILocation, DILocalVariable, DIExpression, Value]
            DEBUG_RECORD_VALUE_SIMPLE = 64,
            /// [DILocation, DILabel]
            DEBUG_RECORD_LABEL = 65,
        };

        pub const DeclareBlocks = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.DECLAREBLOCKS) },
                .{ .vbr = 8 },
            };
            num_blocks: usize,
        };

        pub const Call = struct {
            pub const CallType = packed struct(u17) {
                tail: bool = false,
                call_conv: Builder.CallConv,
                reserved: u3 = 0,
                must_tail: bool = false,
                // We always use the explicit type version as that is what LLVM does
                explicit_type: bool = true,
                no_tail: bool = false,
            };
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CALL) },
                .{ .fixed_runtime = Builder.FunctionAttributes },
                .{ .fixed = @bitSizeOf(CallType) },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev, // Callee
                ValueArrayAbbrev, // Args
            };

            attributes: Builder.FunctionAttributes,
            call_type: CallType,
            type_id: Builder.Type,
            callee: Builder.Value,
            args: []const Builder.Value,
        };

        pub const CallFast = struct {
            const CallType = packed struct(u18) {
                tail: bool = false,
                call_conv: Builder.CallConv,
                reserved: u3 = 0,
                must_tail: bool = false,
                // We always use the explicit type version as that is what LLVM does
                explicit_type: bool = true,
                no_tail: bool = false,
                fast: bool = true,
            };

            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CALL) },
                .{ .fixed_runtime = Builder.FunctionAttributes },
                .{ .fixed = @bitSizeOf(CallType) },
                .{ .fixed = @bitSizeOf(Builder.FastMath) },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev, // Callee
                ValueArrayAbbrev, // Args
            };

            attributes: Builder.FunctionAttributes,
            call_type: CallType,
            fast_math: Builder.FastMath,
            type_id: Builder.Type,
            callee: Builder.Value,
            args: []const Builder.Value,
        };

        pub const FNeg = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_UNOP) },
                ValueAbbrev,
                .{ .literal = 0 },
            };

            val: u32,
        };

        pub const FNegFast = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_UNOP) },
                ValueAbbrev,
                .{ .literal = 0 },
                .{ .fixed = @bitSizeOf(Builder.FastMath) },
            };

            val: u32,
            fast_math: Builder.FastMath,
        };

        pub const Binary = struct {
            const BinaryOpcode = Builder.BinaryOpcode;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BINOP) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(BinaryOpcode) },
            };

            lhs: u32,
            rhs: u32,
            opcode: BinaryOpcode,
        };

        pub const BinaryNoWrap = struct {
            const BinaryOpcode = Builder.BinaryOpcode;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BINOP) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(BinaryOpcode) },
                .{ .fixed = 2 },
            };

            lhs: u32,
            rhs: u32,
            opcode: BinaryOpcode,
            flags: packed struct(u2) {
                no_unsigned_wrap: bool,
                no_signed_wrap: bool,
            },
        };

        pub const BinaryExact = struct {
            const BinaryOpcode = Builder.BinaryOpcode;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BINOP) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(BinaryOpcode) },
                .{ .literal = 1 },
            };

            lhs: u32,
            rhs: u32,
            opcode: BinaryOpcode,
        };

        pub const BinaryFast = struct {
            const BinaryOpcode = Builder.BinaryOpcode;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BINOP) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(BinaryOpcode) },
                .{ .fixed = @bitSizeOf(Builder.FastMath) },
            };

            lhs: u32,
            rhs: u32,
            opcode: BinaryOpcode,
            fast_math: Builder.FastMath,
        };

        pub const Cmp = struct {
            const CmpPredicate = Builder.CmpPredicate;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CMP2) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(CmpPredicate) },
            };

            lhs: u32,
            rhs: u32,
            pred: CmpPredicate,
        };

        pub const CmpFast = struct {
            const CmpPredicate = Builder.CmpPredicate;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CMP2) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(CmpPredicate) },
                .{ .fixed = @bitSizeOf(Builder.FastMath) },
            };

            lhs: u32,
            rhs: u32,
            pred: CmpPredicate,
            fast_math: Builder.FastMath,
        };

        pub const Select = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_VSELECT) },
                ValueAbbrev,
                ValueAbbrev,
                ValueAbbrev,
            };

            lhs: u32,
            rhs: u32,
            cond: u32,
        };

        pub const SelectFast = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_VSELECT) },
                ValueAbbrev,
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(Builder.FastMath) },
            };

            lhs: u32,
            rhs: u32,
            cond: u32,
            fast_math: Builder.FastMath,
        };

        pub const Cast = struct {
            const CastOpcode = Builder.CastOpcode;
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CAST) },
                ValueAbbrev,
                .{ .fixed_runtime = Builder.Type },
                .{ .fixed = @bitSizeOf(CastOpcode) },
            };

            val: u32,
            type_index: Builder.Type,
            opcode: CastOpcode,
        };

        pub const TruncNoWrap = struct {
            pub const Flags = packed struct(u2) {
                no_unsigned_wrap: bool,
                no_signed_wrap: bool,
            };
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CAST) },
                ValueAbbrev,
                .{ .fixed_runtime = Builder.Type },
                .{ .literal = @backingInt(Builder.CastOpcode.trunc) },
                .{ .fixed = @bitSizeOf(Flags) },
            };

            val: u32,
            type_index: Builder.Type,
            flags: Flags,
        };

        pub const Alloca = struct {
            pub const Flags = packed struct(u11) {
                align_lower: u5,
                inalloca: bool,
                explicit_type: bool,
                swift_error: bool,
                align_upper: u3,
            };
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_ALLOCA) },
                .{ .fixed_runtime = Builder.Type },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(Flags) },
            };

            inst_type: Builder.Type,
            len_type: Builder.Type,
            len_value: u32,
            flags: Flags,
        };

        pub const RetVoid = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_RET) },
            };
        };

        pub const Ret = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_RET) },
                ValueAbbrev,
            };
            val: u32,
        };

        pub const GetElementPtr = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_GEP) },
                .{ .fixed = 1 },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev,
                ValueArrayAbbrev,
            };

            is_inbounds: bool,
            type_index: Builder.Type,
            base: Builder.Value,
            indices: []const Builder.Value,
        };

        pub const ExtractValue = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_EXTRACTVAL) },
                ValueAbbrev,
                ValueArrayAbbrev,
            };

            val: u32,
            indices: []const u32,
        };

        pub const InsertValue = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_INSERTVAL) },
                ValueAbbrev,
                ValueAbbrev,
                ValueArrayAbbrev,
            };

            val: u32,
            elem: u32,
            indices: []const u32,
        };

        pub const ExtractElement = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_EXTRACTELT) },
                ValueAbbrev,
                ValueAbbrev,
            };

            val: u32,
            index: u32,
        };

        pub const InsertElement = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_INSERTELT) },
                ValueAbbrev,
                ValueAbbrev,
                ValueAbbrev,
            };

            val: u32,
            elem: u32,
            index: u32,
        };

        pub const ShuffleVector = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_SHUFFLEVEC) },
                ValueAbbrev,
                ValueAbbrev,
                ValueAbbrev,
            };

            lhs: u32,
            rhs: u32,
            mask: u32,
        };

        pub const Unreachable = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_UNREACHABLE) },
            };
        };

        pub const Load = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_LOAD) },
                ValueAbbrev,
                .{ .fixed_runtime = Builder.Type },
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
                .{ .fixed = 1 },
            };
            ptr: u32,
            ty: Builder.Type,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
            is_volatile: bool,
        };

        pub const LoadAtomic = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_LOADATOMIC) },
                ValueAbbrev,
                .{ .fixed_runtime = Builder.Type },
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
                .{ .fixed = 1 },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = @bitSizeOf(Builder.SyncScope) },
            };
            ptr: u32,
            ty: Builder.Type,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
            is_volatile: bool,
            success_ordering: Builder.AtomicOrdering,
            sync_scope: Builder.SyncScope,
        };

        pub const Store = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_STORE) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
                .{ .fixed = 1 },
            };
            ptr: u32,
            val: u32,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
            is_volatile: bool,
        };

        pub const StoreAtomic = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_STOREATOMIC) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
                .{ .fixed = 1 },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = @bitSizeOf(Builder.SyncScope) },
            };
            ptr: u32,
            val: u32,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
            is_volatile: bool,
            success_ordering: Builder.AtomicOrdering,
            sync_scope: Builder.SyncScope,
        };

        pub const BrUnconditional = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BR) },
                BlockAbbrev,
            };
            block: u32,
        };

        pub const BrConditional = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_BR) },
                BlockAbbrev,
                BlockAbbrev,
                BlockAbbrev,
            };
            then_block: u32,
            else_block: u32,
            condition: u32,
        };

        pub const VaArg = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_VAARG) },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev,
                .{ .fixed_runtime = Builder.Type },
            };
            list_type: Builder.Type,
            list: u32,
            type: Builder.Type,
        };

        pub const AtomicRmw = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_ATOMICRMW) },
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = @bitSizeOf(Builder.Function.Instruction.AtomicRmw.Operation) },
                .{ .fixed = 1 },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = @bitSizeOf(Builder.SyncScope) },
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
            };
            ptr: u32,
            val: u32,
            operation: Builder.Function.Instruction.AtomicRmw.Operation,
            is_volatile: bool,
            success_ordering: Builder.AtomicOrdering,
            sync_scope: Builder.SyncScope,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
        };

        pub const CmpXchg = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_CMPXCHG) },
                ValueAbbrev,
                ValueAbbrev,
                ValueAbbrev,
                .{ .fixed = 1 },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = @bitSizeOf(Builder.SyncScope) },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = 1 },
                .{ .fixed = @bitSizeOf(Builder.Alignment) },
            };
            ptr: u32,
            cmp: u32,
            new: u32,
            is_volatile: bool,
            success_ordering: Builder.AtomicOrdering,
            sync_scope: Builder.SyncScope,
            failure_ordering: Builder.AtomicOrdering,
            is_weak: bool,
            alignment: @Int(.unsigned, @bitSizeOf(Builder.Alignment)),
        };

        pub const Fence = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_FENCE) },
                .{ .fixed = @bitSizeOf(Builder.AtomicOrdering) },
                .{ .fixed = @bitSizeOf(Builder.SyncScope) },
            };
            ordering: Builder.AtomicOrdering,
            sync_scope: Builder.SyncScope,
        };

        pub const DebugLoc = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.DEBUG_LOC) },
                LineAbbrev,
                ColumnAbbrev,
                MetadataAbbrev,
                MetadataAbbrev,
                .{ .literal = 0 },
            };
            line: u32,
            column: u32,
            scope: Builder.Metadata.Optional,
            inlined_at: Builder.Metadata.Optional,
        };

        pub const DebugLocAgain = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.DEBUG_LOC_AGAIN) },
            };
        };

        pub const ColdOperandBundle = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.OPERAND_BUNDLE) },
                .{ .literal = 0 },
            };
        };

        pub const IndirectBr = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.FunctionBlock.Code.INST_INDIRECTBR) },
                .{ .fixed_runtime = Builder.Type },
                ValueAbbrev,
                BlockArrayAbbrev,
            };
            ty: Builder.Type,
            addr: Builder.Value,
            targets: []const Builder.Function.Block.Index,
        };

        pub const ValueSymtabBlock = struct {
            pub const id: BlockId = .VALUE_SYMTAB;

            pub const abbrevs = [_]type{
                ModuleBlock.FunctionBlock.ValueSymtabBlock.BlockEntry,
            };

            /// Value symbol table codes.
            pub const Code = enum(u3) {
                /// VST_ENTRY: [valueid, namechar x N]
                ENTRY = 1,
                /// VST_BBENTRY: [bbid, namechar x N]
                BBENTRY = 2,
                /// VST_FNENTRY: [valueid, offset, namechar x N]
                FNENTRY = 3,
                /// VST_COMBINED_ENTRY: [valueid, refguid]
                COMBINED_ENTRY = 5,
            };

            pub const BlockEntry = struct {
                pub const ops = [_]AbbrevOp{
                    .{ .literal = @backingInt(ModuleBlock.FunctionBlock.ValueSymtabBlock.Code.BBENTRY) },
                    ValueAbbrev,
                    .{ .array_fixed = 8 },
                };
                value_id: u32,
                string: []const u8,
            };
        };

        pub const MetadataBlock = struct {
            pub const id: BlockId = .METADATA;

            pub const abbrevs = [_]type{
                ModuleBlock.FunctionBlock.MetadataBlock.Value,
            };

            pub const Value = struct {
                pub const ops = [_]AbbrevOp{
                    .{ .literal = @backingInt(ModuleBlock.MetadataBlock.Code.VALUE) },
                    .{ .fixed = 32 }, // variable
                    .{ .fixed = 32 }, // expression
                };

                ty: Builder.Type,
                value: Builder.Value,
            };
        };

        pub const MetadataAttachmentBlock = struct {
            pub const id: BlockId = .METADATA_ATTACHMENT;

            pub const abbrevs = [_]type{
                ModuleBlock.FunctionBlock.MetadataAttachmentBlock.AttachmentGlobalSingle,
                ModuleBlock.FunctionBlock.MetadataAttachmentBlock.AttachmentInstructionSingle,
            };

            pub const AttachmentGlobalSingle = struct {
                pub const ops = [_]AbbrevOp{
                    .{ .literal = @backingInt(ModuleBlock.MetadataBlock.Code.ATTACHMENT) },
                    .{ .fixed = 1 },
                    MetadataAbbrev,
                };
                kind: FixedMetadataKind,
                metadata: Builder.Metadata,
            };

            pub const AttachmentInstructionSingle = struct {
                pub const ops = [_]AbbrevOp{
                    .{ .literal = @backingInt(ModuleBlock.MetadataBlock.Code.ATTACHMENT) },
                    ValueAbbrev,
                    .{ .fixed = 5 },
                    MetadataAbbrev,
                };
                inst: u32,
                kind: FixedMetadataKind,
                metadata: Builder.Metadata,
            };
        };
    }