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71 lines
3.3 KiB
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<title>i386-SIMD - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<p>
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<a name="i386_002dSIMD"></a>Next: <a rel="next" accesskey="n" href="i386_002d16bit.html#i386_002d16bit">i386-16bit</a>,
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Previous: <a rel="previous" accesskey="p" href="i386_002dFloat.html#i386_002dFloat">i386-Float</a>,
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Up: <a rel="up" accesskey="u" href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.13.11 Intel's MMX and AMD's 3DNow! SIMD Operations</h4>
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<p><a name="index-MMX_002c-i386-943"></a><a name="index-3DNow_0021_002c-i386-944"></a><a name="index-SIMD_002c-i386-945"></a><a name="index-MMX_002c-x86_002d64-946"></a><a name="index-3DNow_0021_002c-x86_002d64-947"></a><a name="index-SIMD_002c-x86_002d64-948"></a>
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<code>as</code> supports Intel's MMX instruction set (SIMD
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instructions for integer data), available on Intel's Pentium MMX
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processors and Pentium II processors, AMD's K6 and K6-2 processors,
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Cyrix' M2 processor, and probably others. It also supports AMD's 3DNow!
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instruction set (SIMD instructions for 32-bit floating point data)
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available on AMD's K6-2 processor and possibly others in the future.
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<p>Currently, <code>as</code> does not support Intel's floating point
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SIMD, Katmai (KNI).
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<p>The eight 64-bit MMX operands, also used by 3DNow!, are called <span class="samp">%mm0</span>,
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<span class="samp">%mm1</span>, ... <span class="samp">%mm7</span>. They contain eight 8-bit integers, four
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16-bit integers, two 32-bit integers, one 64-bit integer, or two 32-bit
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floating point values. The MMX registers cannot be used at the same time
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as the floating point stack.
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<p>See Intel and AMD documentation, keeping in mind that the operand order in
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instructions is reversed from the Intel syntax.
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</body></html>
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