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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 Exception 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. Page fault, #PF X X A page fault resulted from the execution of the instruction. Alignment check, #AC X X An unaligned memory reference was performed while alignment checking was enabled. SIMD Floating-Point Exception, #XF Invalid-operation exception (IE) Denormalized-operand exception (DE) Real Virtual 8086 Protected Cause of Exception X X X There was an unmasked SIMD floating-point exception while CR4.OSXMMEXCPT = 1. See SIMD Floating-Point Exceptions, below, for details. SIMD Floating-Point Exceptions X X X A source operand was an SNaN value. X X X A source operand was a denormal value. 386 UCOMISS
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology UNPCKHPD Unpack High Double-Precision Floating-Point Unpacks the high-order double-precision floating-point values in the first and second source operands and packs them into quadwords in the destination (first source). The value from the first source operand is packed into the low-order quadword of the destination, and the value from the second source operand is packed into the highorder quadword of the destination. The low-order quadwords of the source operands are ignored. The first source/destination operand is an XMM register. The second source operand is another XMM register or 128-bit memory location. Mnemonic Opcode Description UNPCKHPD xmm1, xmm2/mem128 66 0F 15 /r Unpacks high-order double-precision floating-point values in an XMM register and another XMM register or 128-bit memory location and packs them into the destination XMM register. xmm1 xmm2/mem128 127 64 63 0 127 64 63 0 copy copy 127 64 63 0 unpckhpd.eps Related Instructions UNPCKHPS, UNPCKLPD, UNPCKLPS rFLAGS Affected None MXCSR Flags Affected UNPCKHPD 387
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