Import stripped Arm GNU Toolchain 13.2.Rel1HEAD umineko

https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
author: alk3pInjection <webmaster@raspii.tech> 2024-02-04 16:16:35 +0800
committer: alk3pInjection <webmaster@raspii.tech> 2024-02-04 16:16:35 +0800
commit: abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch)
tree: 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Conversions.html
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+<title>GNU Compiler Collection (GCC) Internals: Conversions</title>
+
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+<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
+<a name="Conversions"></a>
+<div class="header">
+<p>
+Next: <a href="RTL-Declarations.html#RTL-Declarations" accesskey="n" rel="next">RTL Declarations</a>, Previous: <a href="Vector-Operations.html#Vector-Operations" accesskey="p" rel="previous">Vector Operations</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</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="Conversions-1"></a>
+<h3 class="section">14.13 Conversions</h3>
+<a name="index-conversions"></a>
+<a name="index-machine-mode-conversions"></a>
+
+<p>All conversions between machine modes must be represented by
+explicit conversion operations.  For example, an expression
+which is the sum of a byte and a full word cannot be written as
+<code>(plus:SI (reg:QI 34) (reg:SI 80))</code> because the <code>plus</code>
+operation requires two operands of the same machine mode.
+Therefore, the byte-sized operand is enclosed in a conversion
+operation, as in
+</p>
+<div class="smallexample">
+<pre class="smallexample">(plus:SI (sign_extend:SI (reg:QI 34)) (reg:SI 80))
+</pre></div>
+
+<p>The conversion operation is not a mere placeholder, because there
+may be more than one way of converting from a given starting mode
+to the desired final mode.  The conversion operation code says how
+to do it.
+</p>
+<p>For all conversion operations, <var>x</var> must not be <code>VOIDmode</code>
+because the mode in which to do the conversion would not be known.
+The conversion must either be done at compile-time or <var>x</var>
+must be placed into a register.
+</p>
+<dl compact="compact">
+<dd><a name="index-sign_005fextend"></a>
+</dd>
+<dt><code>(sign_extend:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of sign-extending the value <var>x</var>
+to machine mode <var>m</var>.  <var>m</var> must be a fixed-point mode
+and <var>x</var> a fixed-point value of a mode narrower than <var>m</var>.
+</p>
+<a name="index-zero_005fextend"></a>
+</dd>
+<dt><code>(zero_extend:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of zero-extending the value <var>x</var>
+to machine mode <var>m</var>.  <var>m</var> must be a fixed-point mode
+and <var>x</var> a fixed-point value of a mode narrower than <var>m</var>.
+</p>
+<a name="index-float_005fextend"></a>
+</dd>
+<dt><code>(float_extend:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of extending the value <var>x</var>
+to machine mode <var>m</var>.  <var>m</var> must be a floating point mode
+and <var>x</var> a floating point value of a mode narrower than <var>m</var>.
+</p>
+<a name="index-truncate"></a>
+</dd>
+<dt><code>(truncate:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of truncating the value <var>x</var>
+to machine mode <var>m</var>.  <var>m</var> must be a fixed-point mode
+and <var>x</var> a fixed-point value of a mode wider than <var>m</var>.
+</p>
+<a name="index-ss_005ftruncate"></a>
+</dd>
+<dt><code>(ss_truncate:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of truncating the value <var>x</var>
+to machine mode <var>m</var>, using signed saturation in the case of
+overflow.  Both <var>m</var> and the mode of <var>x</var> must be fixed-point
+modes.
+</p>
+<a name="index-us_005ftruncate"></a>
+</dd>
+<dt><code>(us_truncate:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of truncating the value <var>x</var>
+to machine mode <var>m</var>, using unsigned saturation in the case of
+overflow.  Both <var>m</var> and the mode of <var>x</var> must be fixed-point
+modes.
+</p>
+<a name="index-float_005ftruncate"></a>
+</dd>
+<dt><code>(float_truncate:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of truncating the value <var>x</var>
+to machine mode <var>m</var>.  <var>m</var> must be a floating point mode
+and <var>x</var> a floating point value of a mode wider than <var>m</var>.
+</p>
+<a name="index-float"></a>
+</dd>
+<dt><code>(float:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting fixed point value <var>x</var>,
+regarded as signed, to floating point mode <var>m</var>.
+</p>
+<a name="index-unsigned_005ffloat"></a>
+</dd>
+<dt><code>(unsigned_float:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting fixed point value <var>x</var>,
+regarded as unsigned, to floating point mode <var>m</var>.
+</p>
+<a name="index-fix"></a>
+</dd>
+<dt><code>(fix:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>When <var>m</var> is a floating-point mode, represents the result of
+converting floating point value <var>x</var> (valid for mode <var>m</var>) to an
+integer, still represented in floating point mode <var>m</var>, by rounding
+towards zero.
+</p>
+<p>When <var>m</var> is a fixed-point mode, represents the result of
+converting floating point value <var>x</var> to mode <var>m</var>, regarded as
+signed.  How rounding is done is not specified, so this operation may
+be used validly in compiling C code only for integer-valued operands.
+</p>
+<a name="index-unsigned_005ffix"></a>
+</dd>
+<dt><code>(unsigned_fix:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting floating point value <var>x</var> to
+fixed point mode <var>m</var>, regarded as unsigned.  How rounding is done
+is not specified.
+</p>
+<a name="index-fract_005fconvert"></a>
+</dd>
+<dt><code>(fract_convert:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting fixed-point value <var>x</var> to
+fixed-point mode <var>m</var>, signed integer value <var>x</var> to
+fixed-point mode <var>m</var>, floating-point value <var>x</var> to
+fixed-point mode <var>m</var>, fixed-point value <var>x</var> to integer mode <var>m</var>
+regarded as signed, or fixed-point value <var>x</var> to floating-point mode <var>m</var>.
+When overflows or underflows happen, the results are undefined.
+</p>
+<a name="index-sat_005ffract"></a>
+</dd>
+<dt><code>(sat_fract:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting fixed-point value <var>x</var> to
+fixed-point mode <var>m</var>, signed integer value <var>x</var> to
+fixed-point mode <var>m</var>, or floating-point value <var>x</var> to
+fixed-point mode <var>m</var>.
+When overflows or underflows happen, the results are saturated to the
+maximum or the minimum.
+</p>
+<a name="index-unsigned_005ffract_005fconvert"></a>
+</dd>
+<dt><code>(unsigned_fract_convert:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting fixed-point value <var>x</var> to
+integer mode <var>m</var> regarded as unsigned, or unsigned integer value <var>x</var> to
+fixed-point mode <var>m</var>.
+When overflows or underflows happen, the results are undefined.
+</p>
+<a name="index-unsigned_005fsat_005ffract"></a>
+</dd>
+<dt><code>(unsigned_sat_fract:<var>m</var> <var>x</var>)</code></dt>
+<dd><p>Represents the result of converting unsigned integer value <var>x</var> to
+fixed-point mode <var>m</var>.
+When overflows or underflows happen, the results are saturated to the
+maximum or the minimum.
+</p></dd>
+</dl>
+
+<hr>
+<div class="header">
+<p>
+Next: <a href="RTL-Declarations.html#RTL-Declarations" accesskey="n" rel="next">RTL Declarations</a>, Previous: <a href="Vector-Operations.html#Vector-Operations" accesskey="p" rel="previous">Vector Operations</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</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>
+
+
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+</html>
author	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
committer	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
commit	abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch)
tree	00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Conversions.html