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| <a name="Intel_0027s-MMX-and-AMD_0027s-3DNow_0021-SIMD-Operations"></a> |
| <h4 class="subsection">9.15.11 Intel’s MMX and AMD’s 3DNow! SIMD Operations</h4> |
| |
| <a name="index-MMX_002c-i386"></a> |
| <a name="index-3DNow_0021_002c-i386"></a> |
| <a name="index-SIMD_002c-i386"></a> |
| <a name="index-MMX_002c-x86_002d64"></a> |
| <a name="index-3DNow_0021_002c-x86_002d64"></a> |
| <a name="index-SIMD_002c-x86_002d64"></a> |
| |
| <p><code>as</code> supports Intel’s MMX instruction set (SIMD |
| instructions for integer data), available on Intel’s Pentium MMX |
| processors and Pentium II processors, AMD’s K6 and K6-2 processors, |
| Cyrix’ M2 processor, and probably others. It also supports AMD’s 3DNow! |
| instruction set (SIMD instructions for 32-bit floating point data) |
| available on AMD’s K6-2 processor and possibly others in the future. |
| </p> |
| <p>Currently, <code>as</code> does not support Intel’s floating point |
| SIMD, Katmai (KNI). |
| </p> |
| <p>The eight 64-bit MMX operands, also used by 3DNow!, are called ‘<samp>%mm0</samp>’, |
| ‘<samp>%mm1</samp>’, ... ‘<samp>%mm7</samp>’. They contain eight 8-bit integers, four |
| 16-bit integers, two 32-bit integers, one 64-bit integer, or two 32-bit |
| floating point values. The MMX registers cannot be used at the same time |
| as the floating point stack. |
| </p> |
| <p>See Intel and AMD documentation, keeping in mind that the operand order in |
| instructions is reversed from the Intel syntax. |
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