x86 Instruction Set Reference

PXOR - Logical Exclusive OR

Opcode Mnemonic Description
0F EF /r PXOR mm, mm/m64 Bitwise XOR of mm/m64 and mm.
66 0F EF /r PXOR xmm1, xmm2/m128 Bitwise XOR of xmm2/m128 and xmm1.
Description

Performs a bitwise logical exclusive-OR (XOR) operation on the source operand (second operand) and the destination operand (first operand) and stores the result in the destination operand. The source operand can be an MMX technology register or a 64-bit memory location or it can be an XMM register or a 128-bit memory location. The destination operand can be an MMX technology register or an XMM register. Each bit of the result is 1 if the corresponding bits of the two operands are different; each bit is 0 if the corresponding bits of the operands are the same.
Operation 
Destination = Destination ^ Source;
Flags affected

None.

Instruction Latency Throughput Execution Unit
CPUID0F3n/0F2n/069n0F3n/0F2n/069n0F2n
PXOR mm, mm2/2/-1/1/-MMX_ALU
PXOR xmm, xmm2/2/12/2/1MMX_ALU