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-<html><head><title>NASM Manual</title></head>
-<body><h1 align=center>The Netwide Assembler: NASM</h1>
-
-<p align=center><a href="nasmdoc6.html">Next Chapter</a> |
-<a href="nasmdoc4.html">Previous Chapter</a> |
-<a href="nasmdoc0.html">Contents</a> |
-<a href="nasmdoci.html">Index</a>
-<h2><a name="chapter-5">Chapter 5: Standard Macro Packages</a></h2>
-<p>The <code><nobr>%use</nobr></code> directive (see
-<a href="nasmdoc4.html#section-4.6.4">section 4.6.4</a>) includes one of
-the standard macro packages included with the NASM distribution and
-compiled into the NASM binary. It operates like the
-<code><nobr>%include</nobr></code> directive (see
-<a href="nasmdoc4.html#section-4.6.1">section 4.6.1</a>), but the included
-contents is provided by NASM itself.
-<p>The names of standard macro packages are case insensitive, and can be
-quoted or not.
-<h3><a name="section-5.1">5.1 <code><nobr>altreg</nobr></code>: Alternate Register Names</a></h3>
-<p>The <code><nobr>altreg</nobr></code> standard macro package provides
-alternate register names. It provides numeric register names for all
-registers (not just
-<code><nobr>R8</nobr></code>-<code><nobr>R15</nobr></code>), the
-Intel-defined aliases
-<code><nobr>R8L</nobr></code>-<code><nobr>R15L</nobr></code> for the low
-bytes of register (as opposed to the NASM/AMD standard names
-<code><nobr>R8B</nobr></code>-<code><nobr>R15B</nobr></code>), and the
-names <code><nobr>R0H</nobr></code>-<code><nobr>R3H</nobr></code> (by
-analogy with <code><nobr>R0L</nobr></code>-<code><nobr>R3L</nobr></code>)
-for <code><nobr>AH</nobr></code>, <code><nobr>CH</nobr></code>,
-<code><nobr>DH</nobr></code>, and <code><nobr>BH</nobr></code>.
-<p>Example use:
-<p><pre>
-%use altreg
-
-proc:
- mov r0l,r3h ; mov al,bh
- ret
-</pre>
-<p>See also <a href="nasmdo11.html#section-11.1">section 11.1</a>.
-<h3><a name="section-5.2">5.2 <code><nobr>smartalign</nobr></code>: Smart <code><nobr>ALIGN</nobr></code> Macro</a></h3>
-<p>The <code><nobr>smartalign</nobr></code> standard macro package provides
-for an <code><nobr>ALIGN</nobr></code> macro which is more powerful than
-the default (and backwards-compatible) one (see
-<a href="nasmdoc4.html#section-4.11.12">section 4.11.12</a>). When the
-<code><nobr>smartalign</nobr></code> package is enabled, when
-<code><nobr>ALIGN</nobr></code> is used without a second argument, NASM
-will generate a sequence of instructions more efficient than a series of
-<code><nobr>NOP</nobr></code>. Furthermore, if the padding exceeds a
-specific threshold, then NASM will generate a jump over the entire padding
-sequence.
-<p>The specific instructions generated can be controlled with the new
-<code><nobr>ALIGNMODE</nobr></code> macro. This macro takes two parameters:
-one mode, and an optional jump threshold override. The modes are as
-follows:
-<ul>
-<li><code><nobr>generic</nobr></code>: Works on all x86 CPUs and should
-have reasonable performance. The default jump threshold is 8. This is the
-default.
-<li><code><nobr>nop</nobr></code>: Pad out with
-<code><nobr>NOP</nobr></code> instructions. The only difference compared to
-the standard <code><nobr>ALIGN</nobr></code> macro is that NASM can still
-jump over a large padding area. The default jump threshold is 16.
-<li><code><nobr>k7</nobr></code>: Optimize for the AMD K7 (Athlon/Althon
-XP). These instructions should still work on all x86 CPUs. The default jump
-threshold is 16.
-<li><code><nobr>k8</nobr></code>: Optimize for the AMD K8 (Opteron/Althon
-64). These instructions should still work on all x86 CPUs. The default jump
-threshold is 16.
-<li><code><nobr>p6</nobr></code>: Optimize for Intel CPUs. This uses the
-long <code><nobr>NOP</nobr></code> instructions first introduced in Pentium
-Pro. This is incompatible with all CPUs of family 5 or lower, as well as
-some VIA CPUs and several virtualization solutions. The default jump
-threshold is 16.
-</ul>
-<p>The macro <code><nobr>__ALIGNMODE__</nobr></code> is defined to contain
-the current alignment mode. A number of other macros beginning with
-<code><nobr>__ALIGN_</nobr></code> are used internally by this macro
-package.
-<p align=center><a href="nasmdoc6.html">Next Chapter</a> |
-<a href="nasmdoc4.html">Previous Chapter</a> |
-<a href="nasmdoc0.html">Contents</a> |
-<a href="nasmdoci.html">Index</a>
-</body></html>