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ANDN — Logical AND NOT

Opcode/Instruction Op/En 64/32 -bit Mode CPUID Feature Flag Description
VEX.NDS.LZ.0F38.W0 F2 /r ANDN r32a, r32b, r/m32 RVM V/V BMI1 Bitwise AND of inverted r32b with r/m32, store result in r32a.
VEX.NDS.LZ. 0F38.W1 F2 /r ANDN r64a, r64b, r/m64 RVM V/NE BMI1 Bitwise AND of inverted r64b with r/m64, store result in r64a.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RVM ModRM:reg (w) VEX.vvvv (r) ModRM:r/m (r) NA


Performs a bitwise logical AND of inverted second operand (the first source operand) with the third operand (the second source operand). The result is stored in the first operand (destination operand).

This instruction is not supported in real mode and virtual-8086 mode. The operand size is always 32 bits if not in 64-bit mode. In 64-bit mode operand size 64 requires VEX.W1. VEX.W1 is ignored in non-64-bit modes. An attempt to execute this instruction with VEX.L not equal to 0 will cause #UD.


DEST ← (NOT SRC1) bitwiseAND SRC2;
SF ← DEST[OperandSize -1];
ZF ← (DEST = 0);

Flags Affected

SF and ZF are updated based on result. OF and CF flags are cleared. AF and PF flags are undefined.

Intel C/C++ Compiler Intrinsic Equivalent

Auto-generated from high-level language.

SIMD Floating-Point Exceptions


Other Exceptions

See Section 2.5.1, “Exception Conditions for VEX-Encoded GPR Instructions”, Table 2-29; additionally

#UD If VEX.W = 1.