List of CIL instructions

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This is a list of the instructions in the instruction set of the Common Intermediate Language bytecode.

Opcode Instruction Description Type of instruction
0x58 add Add two values, returning a new value. Base instruction
0xD6 add.ovf Add signed integer values with overflow check. Base instruction
0xD7 add.ovf.un Add unsigned integer values with overflow check. Base instruction
0x5F and Bitwise AND of two integral values, returns an integral value. Base instruction
0xFE 0x00 arglist Return argument list handle for the current method. Base instruction
0x3B beq <int32 (target)> Branch to target if equal. Base instruction
0x2E beq.s <int8 (target)> Branch to target if equal, short form. Base instruction
0x3C bge <int32 (target)> Branch to target if greater than or equal to. Base instruction
0x2F bge.s <int8 (target)> Branch to target if greater than or equal to, short form. Base instruction
0x41 bge.un <int32 (target)> Branch to target if greater than or equal to (unsigned or unordered). Base instruction
0x34 bge.un.s <int8 (target)> Branch to target if greater than or equal to (unsigned or unordered), short form Base instruction
0x3D bgt <int32 (target)> Branch to target if greater than. Base instruction
0x30 bgt.s <int8 (target)> Branch to target if greater than, short form. Base instruction
0x42 bgt.un <int32 (target)> Branch to target if greater than (unsigned or unordered). Base instruction
0x35 bgt.un.s <int8 (target)> Branch to target if greater than (unsigned or unordered), short form. Base instruction
0x3E ble <int32 (target)> Branch to target if less than or equal to. Base instruction
0x31 ble.s <int8 (target)> Branch to target if less than or equal to, short form. Base instruction
0x43 ble.un <int32 (target)> Branch to target if less than or equal to (unsigned or unordered). Base instruction
0x36 ble.un.s <int8 (target)> Branch to target if less than or equal to (unsigned or unordered), short form Base instruction
0x3F blt <int32 (target)> Branch to target if less than. Base instruction
0x32 blt.s <int8 (target)> Branch to target if less than, short form. Base instruction
0x44 blt.un <int32 (target)> Branch to target if less than (unsigned or unordered). Base instruction
0x37 blt.un.s <int8 (target)> Branch to target if less than (unsigned or unordered), short form. Base instruction
0x40 bne.un <int32 (target)> Branch to target if unequal or unordered. Base instruction
0x33 bne.un.s <int8 (target)> Branch to target if unequal or unordered, short form. Base instruction
0x8C box <typeTok> Convert a boxable value to its boxed form Object model instruction
0x38 br <int32 (target)> Branch to target. Base instruction
0x2B br.s <int8 (target)> Branch to target, short form. Base instruction
0x01 break Inform a debugger that a breakpoint has been reached. Base instruction
0x39 brfalse <int32 (target)> Branch to target if value is zero (false). Base instruction
0x2C brfalse.s <int8 (target)> Branch to target if value is zero (false), short form. Base instruction
0x3A brinst <int32 (target)> Branch to target if value is a non-null object reference (alias for brtrue). Base instruction
0x2D brinst.s <int8 (target)> Branch to target if value is a non-null object reference, short form (alias for brtrue.s). Base instruction
0x39 brnull <int32 (target)> Branch to target if value is null (alias for brfalse). Base instruction
0x2C brnull.s <int8 (target)> Branch to target if value is null (alias for brfalse.s), short form. Base instruction
0x3A brtrue <int32 (target)> Branch to target if value is non-zero (true). Base instruction
0x2D brtrue.s <int8 (target)> Branch to target if value is non-zero (true), short form. Base instruction
0x39 brzero <int32 (target)> Branch to target if value is zero (alias for brfalse). Base instruction
0x2C brzero.s <int8 (target)> Branch to target if value is zero (alias for brfalse.s), short form. Base instruction
0x28 call <method> Call method described by method. Base instruction
0x29 calli <callsitedescr> Call method indicated on the stack with arguments described by callsitedescr. Base instruction
0x6F callvirt <method> Call a method associated with an object. Object model instruction
0x74 castclass <class> Cast obj to class. Object model instruction
0xFE 0x01 ceq Push 1 (of type int32) if value1 equals value2, else push 0. Base instruction
0xFE 0x02 cgt Push 1 (of type int32) if value1 > value2, else push 0. Base instruction
0xFE 0x03 cgt.un Push 1 (of type int32) if value1 > value2, unsigned or unordered, else push 0. Base instruction
0xC3 ckfinite Throw ArithmeticException if value is not a finite number. Base instruction
0xFE 0x04 clt Push 1 (of type int32) if value1 < value2, else push 0. Base instruction
0xFE 0x05 clt.un Push 1 (of type int32) if value1 < value2, unsigned or unordered, else push 0. Base instruction
0xFE 0x16 constrained. <thisType> Call a virtual method on a type constrained to be type T Prefix to instruction
0xD3 conv.i Convert to native int, pushing native int on stack. Base instruction
0x67 conv.i1 Convert to int8, pushing int32 on stack. Base instruction
0x68 conv.i2 Convert to int16, pushing int32 on stack. Base instruction
0x69 conv.i4 Convert to int32, pushing int32 on stack. Base instruction
0x6A conv.i8 Convert to int64, pushing int64 on stack. Base instruction
0xD4 conv.ovf.i Convert to a native int (on the stack as native int) and throw an exception on overflow. Base instruction
0x8A conv.ovf.i.un Convert unsigned to a native int (on the stack as native int) and throw an exception on overflow. Base instruction
0xB3 conv.ovf.i1 Convert to an int8 (on the stack as int32) and throw an exception on overflow. Base instruction
0x82 conv.ovf.i1.un Convert unsigned to an int8 (on the stack as int32) and throw an exception on overflow. Base instruction
0xB5 conv.ovf.i2 Convert to an int16 (on the stack as int32) and throw an exception on overflow. Base instruction
0x83 conv.ovf.i2.un Convert unsigned to an int16 (on the stack as int32) and throw an exception on overflow. Base instruction
0xB7 conv.ovf.i4 Convert to an int32 (on the stack as int32) and throw an exception on overflow. Base instruction
0x84 conv.ovf.i4.un Convert unsigned to an int32 (on the stack as int32) and throw an exception on overflow. Base instruction
0xB9 conv.ovf.i8 Convert to an int64 (on the stack as int64) and throw an exception on overflow. Base instruction
0x85 conv.ovf.i8.un Convert unsigned to an int64 (on the stack as int64) and throw an exception on overflow. Base instruction
0xD5 conv.ovf.u Convert to a native unsigned int (on the stack as native int) and throw an exception on overflow. Base instruction
0x8B conv.ovf.u.un Convert unsigned to a native unsigned int (on the stack as native int) and throw an exception on overflow. Base instruction
0xB4 conv.ovf.u1 Convert to an unsigned int8 (on the stack as int32) and throw an exception on overflow. Base instruction
0x86 conv.ovf.u1.un Convert unsigned to an unsigned int8 (on the stack as int32) and throw an exception on overflow. Base instruction
0xB6 conv.ovf.u2 Convert to an unsigned int16 (on the stack as int32) and throw an exception on overflow. Base instruction
0x87 conv.ovf.u2.un Convert unsigned to an unsigned int16 (on the stack as int32) and throw an exception on overflow. Base instruction
0xB8 conv.ovf.u4 Convert to an unsigned int32 (on the stack as int32) and throw an exception on overflow. Base instruction
0x88 conv.ovf.u4.un Convert unsigned to an unsigned int32 (on the stack as int32) and throw an exception on overflow. Base instruction
0xBA conv.ovf.u8 Convert to an unsigned int64 (on the stack as int64) and throw an exception on overflow. Base instruction
0x89 conv.ovf.u8.un Convert unsigned to an unsigned int64 (on the stack as int64) and throw an exception on overflow. Base instruction
0x76 conv.r.un Convert unsigned integer to floating-point, pushing F on stack. Base instruction
0x6B conv.r4 Convert to float32, pushing F on stack. Base instruction
0x6C conv.r8 Convert to float64, pushing F on stack. Base instruction
0xE0 conv.u Convert to native unsigned int, pushing native int on stack. Base instruction
0xD2 conv.u1 Convert to unsigned int8, pushing int32 on stack. Base instruction
0xD1 conv.u2 Convert to unsigned int16, pushing int32 on stack. Base instruction
0x6D conv.u4 Convert to unsigned int32, pushing int32 on stack. Base instruction
0x6E conv.u8 Convert to unsigned int64, pushing int64 on stack. Base instruction
0xFE 0x17 cpblk Copy data from memory to memory. Base instruction
0x70 cpobj <typeTok> Copy a value type from src to dest. Object model instruction
0x5B div Divide two values to return a quotient or floating-point result. Base instruction
0x5C div.un Divide two values, unsigned, returning a quotient. Base instruction
0x25 dup Duplicate the value on the top of the stack. Base instruction
0xDC endfault End fault clause of an exception block. Base instruction
0xFE 0x11 endfilter End an exception handling filter clause. Base instruction
0xDC endfinally End finally clause of an exception block. Base instruction
0xFE 0x18 initblk Set all bytes in a block of memory to a given byte value. Base instruction
0xFE 0x15 initobj <typeTok> Initialize the value at address dest. Object model instruction
0x75 isinst <class> Test if obj is an instance of class, returning null or an instance of that class or interface. Object model instruction
0x27 jmp <method> Exit current method and jump to the specified method. Base instruction
0xFE 0x09 ldarg <uint16 (num)> Load argument numbered num onto the stack. Base instruction
0x02 ldarg.0 Load argument 0 onto the stack. Base instruction
0x03 ldarg.1 Load argument 1 onto the stack. Base instruction
0x04 ldarg.2 Load argument 2 onto the stack. Base instruction
0x05 ldarg.3 Load argument 3 onto the stack. Base instruction
0x0E ldarg.s <uint8 (num)> Load argument numbered num onto the stack, short form. Base instruction
0xFE 0x0A ldarga <uint16 (argNum)> Fetch the address of argument argNum. Base instruction
0x0F ldarga.s <uint8 (argNum)> Fetch the address of argument argNum, short form. Base instruction
0x20 ldc.i4 <int32 (num)> Push num of type int32 onto the stack as int32. Base instruction
0x16 ldc.i4.0 Push 0 onto the stack as int32. Base instruction
0x17 ldc.i4.1 Push 1 onto the stack as int32. Base instruction
0x18 ldc.i4.2 Push 2 onto the stack as int32. Base instruction
0x19 ldc.i4.3 Push 3 onto the stack as int32. Base instruction
0x1A ldc.i4.4 Push 4 onto the stack as int32. Base instruction
0x1B ldc.i4.5 Push 5 onto the stack as int32. Base instruction
0x1C ldc.i4.6 Push 6 onto the stack as int32. Base instruction
0x1D ldc.i4.7 Push 7 onto the stack as int32. Base instruction
0x1E ldc.i4.8 Push 8 onto the stack as int32. Base instruction
0x15 ldc.i4.m1 Push -1 onto the stack as int32. Base instruction
0x15 ldc.i4.M1 Push -1 onto the stack as int32 (alias for ldc.i4.m1). Base instruction
0x1F ldc.i4.s <int8 (num)> Push num onto the stack as int32, short form. Base instruction
0x21 ldc.i8 <int64 (num)> Push num of type int64 onto the stack as int64. Base instruction
0x22 ldc.r4 <float32 (num)> Push num of type float32 onto the stack as F. Base instruction
0x23 ldc.r8 <float64 (num)> Push num of type float64 onto the stack as F. Base instruction
0xA3 ldelem <typeTok> Load the element at index onto the top of the stack. Object model instruction
0x97 ldelem.i Load the element with type native int at index onto the top of the stack as a native int. Object model instruction
0x90 ldelem.i1 Load the element with type int8 at index onto the top of the stack as an int32. Object model instruction
0x92 ldelem.i2 Load the element with type int16 at index onto the top of the stack as an int32. Object model instruction
0x94 ldelem.i4 Load the element with type int32 at index onto the top of the stack as an int32. Object model instruction
0x96 ldelem.i8 Load the element with type int64 at index onto the top of the stack as an int64. Object model instruction
0x98 ldelem.r4 Load the element with type float32 at index onto the top of the stack as an F Object model instruction
0x99 ldelem.r8 Load the element with type float64 at index onto the top of the stack as an F. Object model instruction
0x9A ldelem.ref Load the element at index onto the top of the stack as an O. The type of the O is the same as the element type of the array pushed on the CIL stack. Object model instruction
0x91 ldelem.u1 Load the element with type unsigned int8 at index onto the top of the stack as an int32. Object model instruction
0x93 ldelem.u2 Load the element with type unsigned int16 at index onto the top of the stack as an int32. Object model instruction
0x95 ldelem.u4 Load the element with type unsigned int32 at index onto the top of the stack as an int32. Object model instruction
0x96 ldelem.u8 Load the element with type unsigned int64 at index onto the top of the stack as an int64 (alias for ldelem.i8). Object model instruction
0x8F ldelema <class> Load the address of element at index onto the top of the stack. Object model instruction
0x7B ldfld <field> Push the value of field of object (or value type) obj, onto the stack. Object model instruction
0x7C ldflda <field> Push the address of field of object obj on the stack. Object model instruction
0xFE 0x06 ldftn <method> Push a pointer to a method referenced by method, on the stack. Base instruction
0x4D ldind.i Indirect load value of type native int as native int on the stack Base instruction
0x46 ldind.i1 Indirect load value of type int8 as int32 on the stack. Base instruction
0x48 ldind.i2 Indirect load value of type int16 as int32 on the stack. Base instruction
0x4A ldind.i4 Indirect load value of type int32 as int32 on the stack. Base instruction
0x4C ldind.i8 Indirect load value of type int64 as int64 on the stack. Base instruction
0x4E ldind.r4 Indirect load value of type float32 as F on the stack. Base instruction
0x4F ldind.r8 Indirect load value of type float64 as F on the stack. Base instruction
0x50 ldind.ref Indirect load value of type object ref as O on the stack. Base instruction
0x47 ldind.u1 Indirect load value of type unsigned int8 as int32 on the stack Base instruction
0x49 ldind.u2 Indirect load value of type unsigned int16 as int32 on the stack Base instruction
0x4B ldind.u4 Indirect load value of type unsigned int32 as int32 on the stack Base instruction
0x4C ldind.u8 Indirect load value of type unsigned int64 as int64 on the stack (alias for ldind.i8). Base instruction
0x8E ldlen Push the length (of type native unsigned int) of array on the stack. Object model instruction
0xFE 0x0C ldloc <uint16 (indx)> Load local variable of index indx onto stack. Base instruction
0x06 ldloc.0 Load local variable 0 onto stack. Base instruction
0x07 ldloc.1 Load local variable 1 onto stack. Base instruction
0x08 ldloc.2 Load local variable 2 onto stack. Base instruction
0x09 ldloc.3 Load local variable 3 onto stack. Base instruction
0x11 ldloc.s <uint8 (indx)> Load local variable of index indx onto stack, short form. Base instruction
0xFE 0x0D ldloca <uint16 (indx)> Load address of local variable with index indx. Base instruction
0x12 ldloca.s <uint8 (indx)> Load address of local variable with index indx, short form. Base instruction
0x14 ldnull Push a null reference on the stack. Base instruction
0x71 ldobj <typeTok> Copy the value stored at address src to the stack. Object model instruction
0x7E ldsfld <field> Push the value of field on the stack. Object model instruction
0x7F ldsflda <field> Push the address of the static field, field, on the stack. Object model instruction
0x72 ldstr <string> Push a string object for the literal string. Object model instruction
0xD0 ldtoken <token> Convert metadata token to its runtime representation. Object model instruction
0xFE 0x07 ldvirtftn <method> Push address of virtual method on the stack. Object model instruction
0xDD leave <int32 (target)> Exit a protected region of code. Base instruction
0xDE leave.s <int8 (target)> Exit a protected region of code, short form. Base instruction
0xFE 0x0F localloc Allocate space from the local memory pool. Base instruction
0xC6 mkrefany <class> Push a typed reference to ptr of type class onto the stack. Object model instruction
0x5A mul Multiply values. Base instruction
0xD8 mul.ovf Multiply signed integer values. Signed result shall fit in same size Base instruction
0xD9 mul.ovf.un Multiply unsigned integer values. Unsigned result shall fit in same size Base instruction
0x65 neg Negate value. Base instruction
0x8D newarr <etype> Create a new array with elements of type etype. Object model instruction
0x73 newobj <ctor> Allocate an uninitialized object or value type and call ctor. Object model instruction
0xFE 0x19
no. {
 typecheck,
 rangecheck,
 nullcheck
 }
The specified fault check(s) normally performed as part of the execution of the subsequent instruction can/shall be skipped. Prefix to instruction
0x00 nop Do nothing (No operation). Base instruction
0x66 not Bitwise complement (logical not). Base instruction
0x60 or Bitwise OR of two integer values, returns an integer. Base instruction
0x26 pop Pop value from the stack. Base instruction
0xFE 0x1E readonly. Specify that the subsequent array address operation performs no type check at runtime, and that it returns a controlled-mutability managed pointer Prefix to instruction
0xFE 0x1D refanytype Push the type token stored in a typed reference. Object model instruction
0xC2 refanyval <type> Push the address stored in a typed reference. Object model instruction
0x5D rem Remainder when dividing one value by another. Base instruction
0x5E rem.un Remainder when dividing one unsigned value by another. Base instruction
0x2A ret Return from method, possibly with a value. Base instruction
0xFE 0x1A rethrow Rethrow the current exception. Object model instruction
0x62 shl Shift an integer left (shifting in zeros), return an integer. Base instruction
0x63 shr Shift an integer right (shift in sign), return an integer. Base instruction
0x64 shr.un Shift an integer right (shift in zero), return an integer. Base instruction
0xFE 0x1C sizeof <typeTok> Push the size, in bytes, of a type as an unsigned int32. Object model instruction
0xFE 0x0B starg <uint16 (num)> Store value to the argument numbered num. Base instruction
0x10 starg.s <uint8 (num)> Store value to the argument numbered num, short form. Base instruction
0xA4 stelem <typeTok> Replace array element at index with the value on the stack Object model instruction
0x9B stelem.i Replace array element at index with the i value on the stack. Object model instruction
0x9C stelem.i1 Replace array element at index with the int8 value on the stack. Object model instruction
0x9D stelem.i2 Replace array element at index with the int16 value on the stack. Object model instruction
0x9E stelem.i4 Replace array element at index with the int32 value on the stack. Object model instruction
0x9F stelem.i8 Replace array element at index with the int64 value on the stack. Object model instruction
0xA0 stelem.r4 Replace array element at index with the float32 value on the stack. Object model instruction
0xA1 stelem.r8 Replace array element at index with the float64 value on the stack. Object model instruction
0xA2 stelem.ref Replace array element at index with the ref value on the stack. Object model instruction
0x7D stfld <field> Replace the value of field of the object obj with value. Object model instruction
0xDF stind.i Store value of type native int into memory at address Base instruction
0x52 stind.i1 Store value of type int8 into memory at address Base instruction
0x53 stind.i2 Store value of type int16 into memory at address Base instruction
0x54 stind.i4 Store value of type int32 into memory at address Base instruction
0x55 stind.i8 Store value of type int64 into memory at address Base instruction
0x56 stind.r4 Store value of type float32 into memory at address Base instruction
0x57 stind.r8 Store value of type float64 into memory at address Base instruction
0x51 stind.ref Store value of type object ref (type O) into memory at address Base instruction
0xFE 0x0E stloc <uint16 (indx)> Pop a value from stack into local variable indx. Base instruction
0x0A stloc.0 Pop a value from stack into local variable 0. Base instruction
0x0B stloc.1 Pop a value from stack into local variable 1. Base instruction
0x0C stloc.2 Pop a value from stack into local variable 2. Base instruction
0x0D stloc.3 Pop a value from stack into local variable 3. Base instruction
0x13 stloc.s <uint8 (indx)> Pop a value from stack into local variable indx, short form. Base instruction
0x81 stobj <typeTok> Store a value of type typeTok at an address. Object model instruction
0x80 stsfld <field> Replace the value of field with val. Object model instruction
0x59 sub Subtract value2 from value1, returning a new value. Base instruction
0xDA sub.ovf Subtract native int from a native int. Signed result shall fit in same size Base instruction
0xDB sub.ovf.un Subtract native unsigned int from a native unsigned int. Unsigned result shall fit in same size. Base instruction
0x45 switch <uint32, int32, int32 (t1..tN)> Jump to one of n values. Base instruction
0xFE 0x14 tail. Subsequent call terminates current method Prefix to instruction
0x7A throw Throw an exception. Object model instruction
0xFE 0x12 unaligned. (alignment) Subsequent pointer instruction might be unaligned. Prefix to instruction
0x79 unbox <valuetype> Extract a value-type from obj, its boxed representation. Object model instruction
0xA5 unbox.any <typeTok> Extract a value-type from obj, its boxed representation Object model instruction
0xFE 0x13 volatile. Subsequent pointer reference is volatile. Prefix to instruction
0x61 xor Bitwise XOR of integer values, returns an integer. Base instruction

See also[edit]

References[edit]