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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 PXOR Packed Logical Bitwise Exclusive OR Performs a bitwise exclusive OR of the values in the first and second source operands and writes the result in the destination (first source). The first source/destination operand is an XMM register and the second source operand is another XMM register or 128-bit memory location. Mnemonic Opcode Description PXOR xmm1, xmm2/mem128 66 0F EF /r Performs bitwise logical XOR of values in an XMM register and in another XMM register or 128-bit memory location and writes the result in the destination XMM register. xmm1 127 0 xmm2/mem128 127 0 XOR pxor-128.eps Related Instructions PAND, PANDN, POR rFLAGS Affected None MXCSR Flags Affected None 340 PXOR
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology Exceptions Exception Invalid opcode, #UD Real X Virtual 8086 Protected Cause of Exception X X The SSE2 instructions are not supported, as indicated by bit 26 of CPUID standard function 1. X X X The emulate bit (EM) of CR0 was set to 1. X X X The operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 is cleared to 0. Device not available, X X X The task-switch bit (TS) of CR0 was set to 1. #NM Stack, #SS X X X A memory address exceeded the stack segment limit or was non-canonical. General protection, #GP X X X A memory address exceeded a data segment limit or was non-canonical. X A null data segment was used to reference memory. X X X The memory operand was not aligned on a 16-byte boundary. Page fault, #PF X X A page fault resulted from the execution of the instruction. PXOR 341
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