Tag

        pub const Tag = enum(u8) {
            add,
            @"add nsw",
            @"add nuw",
            @"add nuw nsw",
            addrspacecast,
            alloca,
            @"alloca inalloca",
            @"and",
            arg,
            ashr,
            @"ashr exact",
            atomicrmw,
            bitcast,
            block,
            br,
            br_cond,
            call,
            @"call fast",
            cmpxchg,
            @"cmpxchg weak",
            extractelement,
            extractvalue,
            fadd,
            @"fadd fast",
            @"fcmp false",
            @"fcmp fast false",
            @"fcmp fast oeq",
            @"fcmp fast oge",
            @"fcmp fast ogt",
            @"fcmp fast ole",
            @"fcmp fast olt",
            @"fcmp fast one",
            @"fcmp fast ord",
            @"fcmp fast true",
            @"fcmp fast ueq",
            @"fcmp fast uge",
            @"fcmp fast ugt",
            @"fcmp fast ule",
            @"fcmp fast ult",
            @"fcmp fast une",
            @"fcmp fast uno",
            @"fcmp oeq",
            @"fcmp oge",
            @"fcmp ogt",
            @"fcmp ole",
            @"fcmp olt",
            @"fcmp one",
            @"fcmp ord",
            @"fcmp true",
            @"fcmp ueq",
            @"fcmp uge",
            @"fcmp ugt",
            @"fcmp ule",
            @"fcmp ult",
            @"fcmp une",
            @"fcmp uno",
            fdiv,
            @"fdiv fast",
            fence,
            fmul,
            @"fmul fast",
            fneg,
            @"fneg fast",
            fpext,
            fptosi,
            fptoui,
            fptrunc,
            frem,
            @"frem fast",
            fsub,
            @"fsub fast",
            getelementptr,
            @"getelementptr inbounds",
            @"icmp eq",
            @"icmp ne",
            @"icmp sge",
            @"icmp sgt",
            @"icmp sle",
            @"icmp slt",
            @"icmp uge",
            @"icmp ugt",
            @"icmp ule",
            @"icmp ult",
            indirectbr,
            insertelement,
            insertvalue,
            inttoptr,
            load,
            @"load atomic",
            lshr,
            @"lshr exact",
            mul,
            @"mul nsw",
            @"mul nuw",
            @"mul nuw nsw",
            @"musttail call",
            @"musttail call fast",
            @"notail call",
            @"notail call fast",
            @"or",
            phi,
            @"phi fast",
            ptrtoint,
            ret,
            @"ret void",
            sdiv,
            @"sdiv exact",
            select,
            @"select fast",
            sext,
            shl,
            @"shl nsw",
            @"shl nuw",
            @"shl nuw nsw",
            shufflevector,
            sitofp,
            srem,
            store,
            @"store atomic",
            sub,
            @"sub nsw",
            @"sub nuw",
            @"sub nuw nsw",
            @"switch",
            @"tail call",
            @"tail call fast",
            trunc,
            @"trunc nuw",
            @"trunc nsw",
            @"trunc nuw nsw",
            udiv,
            @"udiv exact",
            urem,
            uitofp,
            @"unreachable",
            va_arg,
            xor,
            zext,

            pub fn toBinaryOpcode(self: Tag) BinaryOpcode {
                return switch (self) {
                    .add,
                    .@"add nsw",
                    .@"add nuw",
                    .@"add nuw nsw",
                    .fadd,
                    .@"fadd fast",
                    => .add,
                    .sub,
                    .@"sub nsw",
                    .@"sub nuw",
                    .@"sub nuw nsw",
                    .fsub,
                    .@"fsub fast",
                    => .sub,
                    .sdiv,
                    .@"sdiv exact",
                    .fdiv,
                    .@"fdiv fast",
                    => .sdiv,
                    .fmul,
                    .@"fmul fast",
                    .mul,
                    .@"mul nsw",
                    .@"mul nuw",
                    .@"mul nuw nsw",
                    => .mul,
                    .srem,
                    .frem,
                    .@"frem fast",
                    => .srem,
                    .udiv,
                    .@"udiv exact",
                    => .udiv,
                    .shl,
                    .@"shl nsw",
                    .@"shl nuw",
                    .@"shl nuw nsw",
                    => .shl,
                    .lshr,
                    .@"lshr exact",
                    => .lshr,
                    .ashr,
                    .@"ashr exact",
                    => .ashr,
                    .@"and" => .@"and",
                    .@"or" => .@"or",
                    .xor => .xor,
                    .urem => .urem,
                    else => unreachable,
                };
            }

            /// Does not accept `.@"trunc nuw"`, `.@"trunc nsw"`, or `.@"trunc nuw nsw"`, because
            /// they do not have distinct `CastOpcode` values, and are instead encoded in bitcode
            /// using flags on a normal `trunc` operation.
            fn toCastOpcode(self: Tag) CastOpcode {
                return switch (self) {
                    .trunc => .trunc,
                    .zext => .zext,
                    .sext => .sext,
                    .fptoui => .fptoui,
                    .fptosi => .fptosi,
                    .uitofp => .uitofp,
                    .sitofp => .sitofp,
                    .fptrunc => .fptrunc,
                    .fpext => .fpext,
                    .ptrtoint => .ptrtoint,
                    .inttoptr => .inttoptr,
                    .bitcast => .bitcast,
                    .addrspacecast => .addrspacecast,
                    else => unreachable,
                };
            }

            pub fn toCmpPredicate(self: Tag) CmpPredicate {
                return switch (self) {
                    .@"fcmp false",
                    .@"fcmp fast false",
                    => .fcmp_false,
                    .@"fcmp oeq",
                    .@"fcmp fast oeq",
                    => .fcmp_oeq,
                    .@"fcmp oge",
                    .@"fcmp fast oge",
                    => .fcmp_oge,
                    .@"fcmp ogt",
                    .@"fcmp fast ogt",
                    => .fcmp_ogt,
                    .@"fcmp ole",
                    .@"fcmp fast ole",
                    => .fcmp_ole,
                    .@"fcmp olt",
                    .@"fcmp fast olt",
                    => .fcmp_olt,
                    .@"fcmp one",
                    .@"fcmp fast one",
                    => .fcmp_one,
                    .@"fcmp ord",
                    .@"fcmp fast ord",
                    => .fcmp_ord,
                    .@"fcmp true",
                    .@"fcmp fast true",
                    => .fcmp_true,
                    .@"fcmp ueq",
                    .@"fcmp fast ueq",
                    => .fcmp_ueq,
                    .@"fcmp uge",
                    .@"fcmp fast uge",
                    => .fcmp_uge,
                    .@"fcmp ugt",
                    .@"fcmp fast ugt",
                    => .fcmp_ugt,
                    .@"fcmp ule",
                    .@"fcmp fast ule",
                    => .fcmp_ule,
                    .@"fcmp ult",
                    .@"fcmp fast ult",
                    => .fcmp_ult,
                    .@"fcmp une",
                    .@"fcmp fast une",
                    => .fcmp_une,
                    .@"fcmp uno",
                    .@"fcmp fast uno",
                    => .fcmp_uno,
                    .@"icmp eq" => .icmp_eq,
                    .@"icmp ne" => .icmp_ne,
                    .@"icmp sge" => .icmp_sge,
                    .@"icmp sgt" => .icmp_sgt,
                    .@"icmp sle" => .icmp_sle,
                    .@"icmp slt" => .icmp_slt,
                    .@"icmp uge" => .icmp_uge,
                    .@"icmp ugt" => .icmp_ugt,
                    .@"icmp ule" => .icmp_ule,
                    .@"icmp ult" => .icmp_ult,
                    else => unreachable,
                };
            }
        }