ia-32_instruction-set-ref_a-m

Exceptions as in real address mode pffault code for a

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Unformatted text preview: the SFENCE or MFENCE instruction should be used in conjunction with MOVNTPS instructions if multiple processors might use different memory types to read/write the destination memory locations. In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15). Operation DEST SRC; Intel C/C++ Compiler Intrinsic Equivalent MOVNTDQ void_mm_stream_ps(float * p, __m128 a) SIMD Floating-Point Exceptions None. 3-644 Vol. 2 INSTRUCTION SET REFERENCE, A-M Protected Mode Exceptions #GP(0) For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment. #SS(0) #PF(fault-code) #NM #UD For an illegal address in the SS segment. For a page fault. If CR0.TS[bit 3] = 1. If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE[bit 25] = 0. Real-Address Mode Exceptions #GP(0) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH. #NM #UD If CR0.TS[bit 3] = 1. If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE2[bit 26] = 0. Virtual-8086 Mode Exceptions Same exceptions as in Real Address Mode #PF(fault-code) For a page fault. Compatibility Mode Exceptions Same exceptions as in Protected Mode. 64-Bit Mode Exceptions #SS(0) #GP(0) If a memory address referencing the SS segment is in a noncanonical form. If the memory address is in a non-canonical form. If memory operand is not aligned on a 16-byte boundary, regardless of segment. #PF(fault-code) #NM For a page fault. If CR0.TS[bit 3] = 1. Vol. 2 3-645 INSTRUCTION SET REFERENCE, A-M #UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE[bit 25] = 0. 3-646 Vol. 2 INSTRUCTION SET REFERENCE, A-M MOVNTQ--Store of Quadword Using Non-Temporal Hint 64-Bit Mode Valid Compat/ Leg Mode Valid Opcode 0F E7 /r Instruction MOVNTQ m64, mm Description Move quadword from mm to m64 using non-temporal hint. Description Moves the quadword in the source operand (second operand) to the destination operand (first operand) using a non-temporal hint to minimize cache pollution during the write to memory. The source operand is an MMX technology register, which is assumed to contain packed integer data (packed bytes, words, or doublewords). The destination operand is a 64-bit memory location. The non-temporal hint is implemented by using a write combining (WC) memory type protocol when writing the data to memory. Using this protocol, the processor does not write the data into the cache hierarchy, nor does it fetch the corresponding cache line from memory into the cache hierarchy. The memory type of the region being written to can override the non-temporal hint, if the memory address specified for the non-temporal store is in an uncacheable (UC) or write protected (WP) memory region. For more information on non-temporal stores, see "Caching of T...
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This note was uploaded on 10/01/2013 for the course CPE 103 taught by Professor Watlins during the Winter '11 term at Mississippi State.

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