Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

Vol. 2B 4-223
INSTRUCTION SET REFERENCE, N-Z
PXOR—Logical Exclusive OR
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.
In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to
access additional registers (XMM8-XMM15).
Operation
DEST ← DEST XOR SRC;
Intel C/C++ Compiler Intrinsic Equivalent
PXOR __m64 _mm_xor_si64 (__m64 m1, __m64 m2)
PXOR __m128i _mm_xor_si128 ( __m128i a, __m128i b)
Flags Affected
None.
Numeric Exceptions
None.
Protected Mode Exceptions
#GP(0) If a memory operand effective address is outside the CS, DS,
ES, FS, or GS segment limit.
(128-bit operations only) If a memory operand is not aligned on
a 16-byte boundary, regardless of segment.
Opcode Instruction
64-Bit
Mode
Compat/
Leg Mode Description
0F EF /r PXOR mm, mm/m64 Valid Valid Bitwise XOR of
mm/m64 and mm.
66 0F EF
/r
PXOR xmm1, xmm2/m128 Valid Valid Bitwise XOR of
xmm2/m128 and
xmm1.