Defined as a 64 bit structure containing packed data

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Unformatted text preview: nt data type (four IEEE singleprecision floating-point values packed into a double quadword). Instructions that perform SIMD operations on single-precision floating-point values and that extend SIMD operations that can be performed on integers: -- 128-bit Packed and scalar single-precision floating-point instructions that operate on data located in MMX registers -- 64-bit SIMD integer instructions that support additional operations on packed integer operands located in MMX registers Instructions that save and restore the state of the MXCSR register. Vol. 1 10-1 PROGRAMMING WITH STREAMING SIMD EXTENSIONS (SSE) Instructions that support explicit prefetching of data, control of the cacheability of data, and control the ordering of store operations. Extensions to the CPUID instruction. These features extend the IA-32 architecture's SIMD programming model in four important ways: The ability to perform SIMD operations on four packed single-precision floatingpoint values enhances the performance of IA-32 processors for advanced media and communications applications that use computation-intensive algorithms to perform repetitive operations on large arrays of simple, native data elements. The ability to perform SIMD single-precision floating-point operations in XMM registers and SIMD integer operations in MMX registers provides greater flexibility and throughput for executing applications that operate on large arrays of floating-point and integer data. Cache control instructions provide the ability to stream data in and out of XMM registers without polluting the caches and the ability to prefetch data to selected cache levels before it is actually used. Applications that require regular access to large amounts of data benefit from these prefetching and streaming store capabilities. The SFENCE (store fence) instruction provides greater control over the ordering of store operations when using weakly-ordered memory types. SSE extensions are fully compatible with all software written for IA-32 processors. All existing software continues to run correctly, without modification, on processors that incorporate SSE extensions. Enhancements to CPUID permit detection of SSE extensions. SSE extensions are accessible from all IA-32 execution modes: protected mode, real address mode, and virtual-8086 mode. The following sections of this chapter describe the programming environment for SSE extensions, including: XMM registers, the packed single-precision floating-point data type, and SSE instructions. For additional information, see: Section 11.6, "Writing Applications with SSE/SSE2 Extensions". Section 11.5, "SSE, SSE2, and SSE3 Exceptions," describes the exceptions that can be generated with SSE/SSE2/SSE3 instructions. Intel 64 and IA-32 Architectures Software Developer's Manual, Volumes 2A & 2B, provide a detailed description of these instructions. Chapter 12, "System Programming for Streaming SIMD Instruction Sets," in the Intel 64 and IA-...
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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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