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 <a name="Alignment-Output"></a>
 <div class="header">
 <p>
 Previous: <a href="Exception-Region-Output.html#Exception-Region-Output" accesskey="p" rel="prev">Exception Region Output</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
 </div>
 <hr>
 <a name="Assembler-Commands-for-Alignment"></a>
 <h4 class="subsection">17.21.10 Assembler Commands for Alignment</h4>

 <p>This describes commands for alignment.
 </p>
 <dl>
 <dt><a name="index-JUMP_005fALIGN"></a>Macro: <strong>JUMP_ALIGN</strong> <em>(<var>label</var>)</em></dt>
 <dd><p>The alignment (log base 2) to put in front of <var>label</var>, which is
 a common destination of jumps and has no fallthru incoming edge.
 </p>
 <p>This macro need not be defined if you don&rsquo;t want any special alignment
 to be done at such a time.  Most machine descriptions do not currently
 define the macro.
 </p>
 <p>Unless it&rsquo;s necessary to inspect the <var>label</var> parameter, it is better
 to set the variable <var>align_jumps</var> in the target&rsquo;s
 <code>TARGET_OPTION_OVERRIDE</code>.  Otherwise, you should try to honor the user&rsquo;s
 selection in <var>align_jumps</var> in a <code>JUMP_ALIGN</code> implementation.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fASM_005fJUMP_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_JUMP_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
 <dd><p>The maximum number of bytes to skip before <var>label</var> when applying
 <code>JUMP_ALIGN</code>.  This works only if
 <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is defined.
 </p></dd></dl>

 <dl>
 <dt><a name="index-LABEL_005fALIGN_005fAFTER_005fBARRIER"></a>Macro: <strong>LABEL_ALIGN_AFTER_BARRIER</strong> <em>(<var>label</var>)</em></dt>
 <dd><p>The alignment (log base 2) to put in front of <var>label</var>, which follows
 a <code>BARRIER</code>.
 </p>
 <p>This macro need not be defined if you don&rsquo;t want any special alignment
 to be done at such a time.  Most machine descriptions do not currently
 define the macro.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fASM_005fLABEL_005fALIGN_005fAFTER_005fBARRIER_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
 <dd><p>The maximum number of bytes to skip before <var>label</var> when applying
 <code>LABEL_ALIGN_AFTER_BARRIER</code>.  This works only if
 <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is defined.
 </p></dd></dl>

 <dl>
 <dt><a name="index-LOOP_005fALIGN"></a>Macro: <strong>LOOP_ALIGN</strong> <em>(<var>label</var>)</em></dt>
 <dd><p>The alignment (log base 2) to put in front of <var>label</var> that heads
 a frequently executed basic block (usually the header of a loop).
 </p>
 <p>This macro need not be defined if you don&rsquo;t want any special alignment
 to be done at such a time.  Most machine descriptions do not currently
 define the macro.
 </p>
 <p>Unless it&rsquo;s necessary to inspect the <var>label</var> parameter, it is better
 to set the variable <code>align_loops</code> in the target&rsquo;s
 <code>TARGET_OPTION_OVERRIDE</code>.  Otherwise, you should try to honor the user&rsquo;s
 selection in <code>align_loops</code> in a <code>LOOP_ALIGN</code> implementation.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fASM_005fLOOP_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LOOP_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
 <dd><p>The maximum number of bytes to skip when applying <code>LOOP_ALIGN</code> to
 <var>label</var>.  This works only if <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is
 defined.
 </p></dd></dl>

 <dl>
 <dt><a name="index-LABEL_005fALIGN"></a>Macro: <strong>LABEL_ALIGN</strong> <em>(<var>label</var>)</em></dt>
 <dd><p>The alignment (log base 2) to put in front of <var>label</var>.
 If <code>LABEL_ALIGN_AFTER_BARRIER</code> / <code>LOOP_ALIGN</code> specify a different alignment,
 the maximum of the specified values is used.
 </p>
 <p>Unless it&rsquo;s necessary to inspect the <var>label</var> parameter, it is better
 to set the variable <code>align_labels</code> in the target&rsquo;s
 <code>TARGET_OPTION_OVERRIDE</code>.  Otherwise, you should try to honor the user&rsquo;s
 selection in <code>align_labels</code> in a <code>LABEL_ALIGN</code> implementation.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fASM_005fLABEL_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LABEL_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
 <dd><p>The maximum number of bytes to skip when applying <code>LABEL_ALIGN</code>
 to <var>label</var>.  This works only if <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code>
 is defined.
 </p></dd></dl>

 <dl>
 <dt><a name="index-ASM_005fOUTPUT_005fSKIP"></a>Macro: <strong>ASM_OUTPUT_SKIP</strong> <em>(<var>stream</var>, <var>nbytes</var>)</em></dt>
 <dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
 instruction to advance the location counter by <var>nbytes</var> bytes.
 Those bytes should be zero when loaded.  <var>nbytes</var> will be a C
 expression of type <code>unsigned HOST_WIDE_INT</code>.
 </p></dd></dl>

 <dl>
 <dt><a name="index-ASM_005fNO_005fSKIP_005fIN_005fTEXT"></a>Macro: <strong>ASM_NO_SKIP_IN_TEXT</strong></dt>
 <dd><p>Define this macro if <code>ASM_OUTPUT_SKIP</code> should not be used in the
 text section because it fails to put zeros in the bytes that are skipped.
 This is true on many Unix systems, where the pseudo&ndash;op to skip bytes
 produces no-op instructions rather than zeros when used in the text
 section.
 </p></dd></dl>

 <dl>
 <dt><a name="index-ASM_005fOUTPUT_005fALIGN"></a>Macro: <strong>ASM_OUTPUT_ALIGN</strong> <em>(<var>stream</var>, <var>power</var>)</em></dt>
 <dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
 command to advance the location counter to a multiple of 2 to the
 <var>power</var> bytes.  <var>power</var> will be a C expression of type <code>int</code>.
 </p></dd></dl>

 <dl>
 <dt><a name="index-ASM_005fOUTPUT_005fALIGN_005fWITH_005fNOP"></a>Macro: <strong>ASM_OUTPUT_ALIGN_WITH_NOP</strong> <em>(<var>stream</var>, <var>power</var>)</em></dt>
 <dd><p>Like <code>ASM_OUTPUT_ALIGN</code>, except that the &ldquo;nop&rdquo; instruction is used
 for padding, if necessary.
 </p></dd></dl>

 <dl>
 <dt><a name="index-ASM_005fOUTPUT_005fMAX_005fSKIP_005fALIGN"></a>Macro: <strong>ASM_OUTPUT_MAX_SKIP_ALIGN</strong> <em>(<var>stream</var>, <var>power</var>, <var>max_skip</var>)</em></dt>
 <dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
 command to advance the location counter to a multiple of 2 to the
 <var>power</var> bytes, but only if <var>max_skip</var> or fewer bytes are needed to
 satisfy the alignment request.  <var>power</var> and <var>max_skip</var> will be
 a C expression of type <code>int</code>.
 </p></dd></dl>

 <hr>
 <div class="header">
 <p>
 Previous: <a href="Exception-Region-Output.html#Exception-Region-Output" accesskey="p" rel="prev">Exception Region Output</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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	<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
	<a name="Alignment-Output"></a>
	<div class="header">
	<p>
	Previous: <a href="Exception-Region-Output.html#Exception-Region-Output" accesskey="p" rel="prev">Exception Region Output</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
	</div>
	<hr>
	<a name="Assembler-Commands-for-Alignment"></a>
	<h4 class="subsection">17.21.10 Assembler Commands for Alignment</h4>

	<p>This describes commands for alignment.
	</p>
	<dl>
	<dt><a name="index-JUMP_005fALIGN"></a>Macro: <strong>JUMP_ALIGN</strong> <em>(<var>label</var>)</em></dt>
	<dd><p>The alignment (log base 2) to put in front of <var>label</var>, which is
	a common destination of jumps and has no fallthru incoming edge.
	</p>
	<p>This macro need not be defined if you don’t want any special alignment
	to be done at such a time. Most machine descriptions do not currently
	define the macro.
	</p>
	<p>Unless it’s necessary to inspect the <var>label</var> parameter, it is better
	to set the variable <var>align_jumps</var> in the target’s
	<code>TARGET_OPTION_OVERRIDE</code>. Otherwise, you should try to honor the user’s
	selection in <var>align_jumps</var> in a <code>JUMP_ALIGN</code> implementation.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fASM_005fJUMP_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_JUMP_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
	<dd><p>The maximum number of bytes to skip before <var>label</var> when applying
	<code>JUMP_ALIGN</code>. This works only if
	<code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is defined.
	</p></dd></dl>

	<dl>
	<dt><a name="index-LABEL_005fALIGN_005fAFTER_005fBARRIER"></a>Macro: <strong>LABEL_ALIGN_AFTER_BARRIER</strong> <em>(<var>label</var>)</em></dt>
	<dd><p>The alignment (log base 2) to put in front of <var>label</var>, which follows
	a <code>BARRIER</code>.
	</p>
	<p>This macro need not be defined if you don’t want any special alignment
	to be done at such a time. Most machine descriptions do not currently
	define the macro.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fASM_005fLABEL_005fALIGN_005fAFTER_005fBARRIER_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
	<dd><p>The maximum number of bytes to skip before <var>label</var> when applying
	<code>LABEL_ALIGN_AFTER_BARRIER</code>. This works only if
	<code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is defined.
	</p></dd></dl>

	<dl>
	<dt><a name="index-LOOP_005fALIGN"></a>Macro: <strong>LOOP_ALIGN</strong> <em>(<var>label</var>)</em></dt>
	<dd><p>The alignment (log base 2) to put in front of <var>label</var> that heads
	a frequently executed basic block (usually the header of a loop).
	</p>
	<p>This macro need not be defined if you don’t want any special alignment
	to be done at such a time. Most machine descriptions do not currently
	define the macro.
	</p>
	<p>Unless it’s necessary to inspect the <var>label</var> parameter, it is better
	to set the variable <code>align_loops</code> in the target’s
	<code>TARGET_OPTION_OVERRIDE</code>. Otherwise, you should try to honor the user’s
	selection in <code>align_loops</code> in a <code>LOOP_ALIGN</code> implementation.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fASM_005fLOOP_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LOOP_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
	<dd><p>The maximum number of bytes to skip when applying <code>LOOP_ALIGN</code> to
	<var>label</var>. This works only if <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code> is
	defined.
	</p></dd></dl>

	<dl>
	<dt><a name="index-LABEL_005fALIGN"></a>Macro: <strong>LABEL_ALIGN</strong> <em>(<var>label</var>)</em></dt>
	<dd><p>The alignment (log base 2) to put in front of <var>label</var>.
	If <code>LABEL_ALIGN_AFTER_BARRIER</code> / <code>LOOP_ALIGN</code> specify a different alignment,
	the maximum of the specified values is used.
	</p>
	<p>Unless it’s necessary to inspect the <var>label</var> parameter, it is better
	to set the variable <code>align_labels</code> in the target’s
	<code>TARGET_OPTION_OVERRIDE</code>. Otherwise, you should try to honor the user’s
	selection in <code>align_labels</code> in a <code>LABEL_ALIGN</code> implementation.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fASM_005fLABEL_005fALIGN_005fMAX_005fSKIP"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_LABEL_ALIGN_MAX_SKIP</strong> <em>(rtx <var>label</var>)</em></dt>
	<dd><p>The maximum number of bytes to skip when applying <code>LABEL_ALIGN</code>
	to <var>label</var>. This works only if <code>ASM_OUTPUT_MAX_SKIP_ALIGN</code>
	is defined.
	</p></dd></dl>

	<dl>
	<dt><a name="index-ASM_005fOUTPUT_005fSKIP"></a>Macro: <strong>ASM_OUTPUT_SKIP</strong> <em>(<var>stream</var>, <var>nbytes</var>)</em></dt>
	<dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
	instruction to advance the location counter by <var>nbytes</var> bytes.
	Those bytes should be zero when loaded. <var>nbytes</var> will be a C
	expression of type <code>unsigned HOST_WIDE_INT</code>.
	</p></dd></dl>

	<dl>
	<dt><a name="index-ASM_005fNO_005fSKIP_005fIN_005fTEXT"></a>Macro: <strong>ASM_NO_SKIP_IN_TEXT</strong></dt>
	<dd><p>Define this macro if <code>ASM_OUTPUT_SKIP</code> should not be used in the
	text section because it fails to put zeros in the bytes that are skipped.
	This is true on many Unix systems, where the pseudo–op to skip bytes
	produces no-op instructions rather than zeros when used in the text
	section.
	</p></dd></dl>

	<dl>
	<dt><a name="index-ASM_005fOUTPUT_005fALIGN"></a>Macro: <strong>ASM_OUTPUT_ALIGN</strong> <em>(<var>stream</var>, <var>power</var>)</em></dt>
	<dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
	command to advance the location counter to a multiple of 2 to the
	<var>power</var> bytes. <var>power</var> will be a C expression of type <code>int</code>.
	</p></dd></dl>

	<dl>
	<dt><a name="index-ASM_005fOUTPUT_005fALIGN_005fWITH_005fNOP"></a>Macro: <strong>ASM_OUTPUT_ALIGN_WITH_NOP</strong> <em>(<var>stream</var>, <var>power</var>)</em></dt>
	<dd><p>Like <code>ASM_OUTPUT_ALIGN</code>, except that the “nop” instruction is used
	for padding, if necessary.
	</p></dd></dl>

	<dl>
	<dt><a name="index-ASM_005fOUTPUT_005fMAX_005fSKIP_005fALIGN"></a>Macro: <strong>ASM_OUTPUT_MAX_SKIP_ALIGN</strong> <em>(<var>stream</var>, <var>power</var>, <var>max_skip</var>)</em></dt>
	<dd><p>A C statement to output to the stdio stream <var>stream</var> an assembler
	command to advance the location counter to a multiple of 2 to the
	<var>power</var> bytes, but only if <var>max_skip</var> or fewer bytes are needed to
	satisfy the alignment request. <var>power</var> and <var>max_skip</var> will be
	a C expression of type <code>int</code>.
	</p></dd></dl>

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	Previous: <a href="Exception-Region-Output.html#Exception-Region-Output" accesskey="p" rel="prev">Exception Region Output</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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