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 <a name="Scalar-Return"></a>
 <div class="header">
 <p>
 Next: <a href="Aggregate-Return.html#Aggregate-Return" accesskey="n" rel="next">Aggregate Return</a>, Previous: <a href="Register-Arguments.html#Register-Arguments" accesskey="p" rel="prev">Register Arguments</a>, Up: <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="u" rel="up">Stack and Calling</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="How-Scalar-Function-Values-Are-Returned"></a>
 <h4 class="subsection">17.10.8 How Scalar Function Values Are Returned</h4>
 <a name="index-return-values-in-registers"></a>
 <a name="index-values_002c-returned-by-functions"></a>
 <a name="index-scalars_002c-returned-as-values"></a>

 <p>This section discusses the macros that control returning scalars as
 values&mdash;values that can fit in registers.
 </p>
 <dl>
 <dt><a name="index-TARGET_005fFUNCTION_005fVALUE"></a>Target Hook: <em>rtx</em> <strong>TARGET_FUNCTION_VALUE</strong> <em>(const_tree <var>ret_type</var>, const_tree <var>fn_decl_or_type</var>, bool <var>outgoing</var>)</em></dt>
 <dd>
 <p>Define this to return an RTX representing the place where a function
 returns or receives a value of data type <var>ret_type</var>, a tree node
 representing a data type.  <var>fn_decl_or_type</var> is a tree node
 representing <code>FUNCTION_DECL</code> or <code>FUNCTION_TYPE</code> of a
 function being called.  If <var>outgoing</var> is false, the hook should
 compute the register in which the caller will see the return value.
 Otherwise, the hook should return an RTX representing the place where
 a function returns a value.
 </p>
 <p>On many machines, only <code>TYPE_MODE (<var>ret_type</var>)</code> is relevant.
 (Actually, on most machines, scalar values are returned in the same
 place regardless of mode.)  The value of the expression is usually a
 <code>reg</code> RTX for the hard register where the return value is stored.
 The value can also be a <code>parallel</code> RTX, if the return value is in
 multiple places.  See <code>TARGET_FUNCTION_ARG</code> for an explanation of the
 <code>parallel</code> form.   Note that the callee will populate every
 location specified in the <code>parallel</code>, but if the first element of
 the <code>parallel</code> contains the whole return value, callers will use
 that element as the canonical location and ignore the others.  The m68k
 port uses this type of <code>parallel</code> to return pointers in both
 &lsquo;<samp>%a0</samp>&rsquo; (the canonical location) and &lsquo;<samp>%d0</samp>&rsquo;.
 </p>
 <p>If <code>TARGET_PROMOTE_FUNCTION_RETURN</code> returns true, you must apply
 the same promotion rules specified in <code>PROMOTE_MODE</code> if
 <var>valtype</var> is a scalar type.
 </p>
 <p>If the precise function being called is known, <var>func</var> is a tree
 node (<code>FUNCTION_DECL</code>) for it; otherwise, <var>func</var> is a null
 pointer.  This makes it possible to use a different value-returning
 convention for specific functions when all their calls are
 known.
 </p>
 <p>Some target machines have &ldquo;register windows&rdquo; so that the register in
 which a function returns its value is not the same as the one in which
 the caller sees the value.  For such machines, you should return
 different RTX depending on <var>outgoing</var>.
 </p>
 <p><code>TARGET_FUNCTION_VALUE</code> is not used for return values with
 aggregate data types, because these are returned in another way.  See
 <code>TARGET_STRUCT_VALUE_RTX</code> and related macros, below.
 </p></dd></dl>

 <dl>
 <dt><a name="index-FUNCTION_005fVALUE"></a>Macro: <strong>FUNCTION_VALUE</strong> <em>(<var>valtype</var>, <var>func</var>)</em></dt>
 <dd><p>This macro has been deprecated.  Use <code>TARGET_FUNCTION_VALUE</code> for
 a new target instead.
 </p></dd></dl>

 <dl>
 <dt><a name="index-LIBCALL_005fVALUE"></a>Macro: <strong>LIBCALL_VALUE</strong> <em>(<var>mode</var>)</em></dt>
 <dd><p>A C expression to create an RTX representing the place where a library
 function returns a value of mode <var>mode</var>.
 </p>
 <p>Note that &ldquo;library function&rdquo; in this context means a compiler
 support routine, used to perform arithmetic, whose name is known
 specially by the compiler and was not mentioned in the C code being
 compiled.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fLIBCALL_005fVALUE"></a>Target Hook: <em>rtx</em> <strong>TARGET_LIBCALL_VALUE</strong> <em>(enum machine_mode <var>mode</var>, const_rtx <var>fun</var>)</em></dt>
 <dd><p>Define this hook if the back-end needs to know the name of the libcall
 function in order to determine where the result should be returned.
 </p>
 <p>The mode of the result is given by <var>mode</var> and the name of the called
 library function is given by <var>fun</var>.  The hook should return an RTX
 representing the place where the library function result will be returned.
 </p>
 <p>If this hook is not defined, then LIBCALL_VALUE will be used.
 </p></dd></dl>

 <dl>
 <dt><a name="index-FUNCTION_005fVALUE_005fREGNO_005fP"></a>Macro: <strong>FUNCTION_VALUE_REGNO_P</strong> <em>(<var>regno</var>)</em></dt>
 <dd><p>A C expression that is nonzero if <var>regno</var> is the number of a hard
 register in which the values of called function may come back.
 </p>
 <p>A register whose use for returning values is limited to serving as the
 second of a pair (for a value of type <code>double</code>, say) need not be
 recognized by this macro.  So for most machines, this definition
 suffices:
 </p>
 <div class="smallexample">
 <pre class="smallexample">#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
 </pre></div>

 <p>If the machine has register windows, so that the caller and the called
 function use different registers for the return value, this macro
 should recognize only the caller&rsquo;s register numbers.
 </p>
 <p>This macro has been deprecated.  Use <code>TARGET_FUNCTION_VALUE_REGNO_P</code>
 for a new target instead.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fFUNCTION_005fVALUE_005fREGNO_005fP"></a>Target Hook: <em>bool</em> <strong>TARGET_FUNCTION_VALUE_REGNO_P</strong> <em>(const unsigned int <var>regno</var>)</em></dt>
 <dd><p>A target hook that return <code>true</code> if <var>regno</var> is the number of a hard
 register in which the values of called function may come back.
 </p>
 <p>A register whose use for returning values is limited to serving as the
 second of a pair (for a value of type <code>double</code>, say) need not be
 recognized by this target hook.
 </p>
 <p>If the machine has register windows, so that the caller and the called
 function use different registers for the return value, this target hook
 should recognize only the caller&rsquo;s register numbers.
 </p>
 <p>If this hook is not defined, then FUNCTION_VALUE_REGNO_P will be used.
 </p></dd></dl>

 <dl>
 <dt><a name="index-APPLY_005fRESULT_005fSIZE"></a>Macro: <strong>APPLY_RESULT_SIZE</strong></dt>
 <dd><p>Define this macro if &lsquo;<samp>untyped_call</samp>&rsquo; and &lsquo;<samp>untyped_return</samp>&rsquo;
 need more space than is implied by <code>FUNCTION_VALUE_REGNO_P</code> for
 saving and restoring an arbitrary return value.
 </p></dd></dl>

 <dl>
 <dt><a name="index-TARGET_005fRETURN_005fIN_005fMSB"></a>Target Hook: <em>bool</em> <strong>TARGET_RETURN_IN_MSB</strong> <em>(const_tree <var>type</var>)</em></dt>
 <dd><p>This hook should return true if values of type <var>type</var> are returned
 at the most significant end of a register (in other words, if they are
 padded at the least significant end).  You can assume that <var>type</var>
 is returned in a register; the caller is required to check this.
 </p>
 <p>Note that the register provided by <code>TARGET_FUNCTION_VALUE</code> must
 be able to hold the complete return value.  For example, if a 1-, 2-
 or 3-byte structure is returned at the most significant end of a
 4-byte register, <code>TARGET_FUNCTION_VALUE</code> should provide an
 <code>SImode</code> rtx.
 </p></dd></dl>

 <hr>
 <div class="header">
 <p>
 Next: <a href="Aggregate-Return.html#Aggregate-Return" accesskey="n" rel="next">Aggregate Return</a>, Previous: <a href="Register-Arguments.html#Register-Arguments" accesskey="p" rel="prev">Register Arguments</a>, Up: <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="u" rel="up">Stack and Calling</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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	<a name="Scalar-Return"></a>
	<div class="header">
	<p>
	Next: <a href="Aggregate-Return.html#Aggregate-Return" accesskey="n" rel="next">Aggregate Return</a>, Previous: <a href="Register-Arguments.html#Register-Arguments" accesskey="p" rel="prev">Register Arguments</a>, Up: <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="u" rel="up">Stack and Calling</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="How-Scalar-Function-Values-Are-Returned"></a>
	<h4 class="subsection">17.10.8 How Scalar Function Values Are Returned</h4>
	<a name="index-return-values-in-registers"></a>
	<a name="index-values_002c-returned-by-functions"></a>
	<a name="index-scalars_002c-returned-as-values"></a>

	<p>This section discusses the macros that control returning scalars as
	values—values that can fit in registers.
	</p>
	<dl>
	<dt><a name="index-TARGET_005fFUNCTION_005fVALUE"></a>Target Hook: <em>rtx</em> <strong>TARGET_FUNCTION_VALUE</strong> <em>(const_tree <var>ret_type</var>, const_tree <var>fn_decl_or_type</var>, bool <var>outgoing</var>)</em></dt>
	<dd>
	<p>Define this to return an RTX representing the place where a function
	returns or receives a value of data type <var>ret_type</var>, a tree node
	representing a data type. <var>fn_decl_or_type</var> is a tree node
	representing <code>FUNCTION_DECL</code> or <code>FUNCTION_TYPE</code> of a
	function being called. If <var>outgoing</var> is false, the hook should
	compute the register in which the caller will see the return value.
	Otherwise, the hook should return an RTX representing the place where
	a function returns a value.
	</p>
	<p>On many machines, only <code>TYPE_MODE (<var>ret_type</var>)</code> is relevant.
	(Actually, on most machines, scalar values are returned in the same
	place regardless of mode.) The value of the expression is usually a
	<code>reg</code> RTX for the hard register where the return value is stored.
	The value can also be a <code>parallel</code> RTX, if the return value is in
	multiple places. See <code>TARGET_FUNCTION_ARG</code> for an explanation of the
	<code>parallel</code> form. Note that the callee will populate every
	location specified in the <code>parallel</code>, but if the first element of
	the <code>parallel</code> contains the whole return value, callers will use
	that element as the canonical location and ignore the others. The m68k
	port uses this type of <code>parallel</code> to return pointers in both
	‘<samp>%a0</samp>’ (the canonical location) and ‘<samp>%d0</samp>’.
	</p>
	<p>If <code>TARGET_PROMOTE_FUNCTION_RETURN</code> returns true, you must apply
	the same promotion rules specified in <code>PROMOTE_MODE</code> if
	<var>valtype</var> is a scalar type.
	</p>
	<p>If the precise function being called is known, <var>func</var> is a tree
	node (<code>FUNCTION_DECL</code>) for it; otherwise, <var>func</var> is a null
	pointer. This makes it possible to use a different value-returning
	convention for specific functions when all their calls are
	known.
	</p>
	<p>Some target machines have “register windows” so that the register in
	which a function returns its value is not the same as the one in which
	the caller sees the value. For such machines, you should return
	different RTX depending on <var>outgoing</var>.
	</p>
	<p><code>TARGET_FUNCTION_VALUE</code> is not used for return values with
	aggregate data types, because these are returned in another way. See
	<code>TARGET_STRUCT_VALUE_RTX</code> and related macros, below.
	</p></dd></dl>

	<dl>
	<dt><a name="index-FUNCTION_005fVALUE"></a>Macro: <strong>FUNCTION_VALUE</strong> <em>(<var>valtype</var>, <var>func</var>)</em></dt>
	<dd><p>This macro has been deprecated. Use <code>TARGET_FUNCTION_VALUE</code> for
	a new target instead.
	</p></dd></dl>

	<dl>
	<dt><a name="index-LIBCALL_005fVALUE"></a>Macro: <strong>LIBCALL_VALUE</strong> <em>(<var>mode</var>)</em></dt>
	<dd><p>A C expression to create an RTX representing the place where a library
	function returns a value of mode <var>mode</var>.
	</p>
	<p>Note that “library function” in this context means a compiler
	support routine, used to perform arithmetic, whose name is known
	specially by the compiler and was not mentioned in the C code being
	compiled.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fLIBCALL_005fVALUE"></a>Target Hook: <em>rtx</em> <strong>TARGET_LIBCALL_VALUE</strong> <em>(enum machine_mode <var>mode</var>, const_rtx <var>fun</var>)</em></dt>
	<dd><p>Define this hook if the back-end needs to know the name of the libcall
	function in order to determine where the result should be returned.
	</p>
	<p>The mode of the result is given by <var>mode</var> and the name of the called
	library function is given by <var>fun</var>. The hook should return an RTX
	representing the place where the library function result will be returned.
	</p>
	<p>If this hook is not defined, then LIBCALL_VALUE will be used.
	</p></dd></dl>

	<dl>
	<dt><a name="index-FUNCTION_005fVALUE_005fREGNO_005fP"></a>Macro: <strong>FUNCTION_VALUE_REGNO_P</strong> <em>(<var>regno</var>)</em></dt>
	<dd><p>A C expression that is nonzero if <var>regno</var> is the number of a hard
	register in which the values of called function may come back.
	</p>
	<p>A register whose use for returning values is limited to serving as the
	second of a pair (for a value of type <code>double</code>, say) need not be
	recognized by this macro. So for most machines, this definition
	suffices:
	</p>
	<div class="smallexample">
	<pre class="smallexample">#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
	</pre></div>

	<p>If the machine has register windows, so that the caller and the called
	function use different registers for the return value, this macro
	should recognize only the caller’s register numbers.
	</p>
	<p>This macro has been deprecated. Use <code>TARGET_FUNCTION_VALUE_REGNO_P</code>
	for a new target instead.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fFUNCTION_005fVALUE_005fREGNO_005fP"></a>Target Hook: <em>bool</em> <strong>TARGET_FUNCTION_VALUE_REGNO_P</strong> <em>(const unsigned int <var>regno</var>)</em></dt>
	<dd><p>A target hook that return <code>true</code> if <var>regno</var> is the number of a hard
	register in which the values of called function may come back.
	</p>
	<p>A register whose use for returning values is limited to serving as the
	second of a pair (for a value of type <code>double</code>, say) need not be
	recognized by this target hook.
	</p>
	<p>If the machine has register windows, so that the caller and the called
	function use different registers for the return value, this target hook
	should recognize only the caller’s register numbers.
	</p>
	<p>If this hook is not defined, then FUNCTION_VALUE_REGNO_P will be used.
	</p></dd></dl>

	<dl>
	<dt><a name="index-APPLY_005fRESULT_005fSIZE"></a>Macro: <strong>APPLY_RESULT_SIZE</strong></dt>
	<dd><p>Define this macro if ‘<samp>untyped_call</samp>’ and ‘<samp>untyped_return</samp>’
	need more space than is implied by <code>FUNCTION_VALUE_REGNO_P</code> for
	saving and restoring an arbitrary return value.
	</p></dd></dl>

	<dl>
	<dt><a name="index-TARGET_005fRETURN_005fIN_005fMSB"></a>Target Hook: <em>bool</em> <strong>TARGET_RETURN_IN_MSB</strong> <em>(const_tree <var>type</var>)</em></dt>
	<dd><p>This hook should return true if values of type <var>type</var> are returned
	at the most significant end of a register (in other words, if they are
	padded at the least significant end). You can assume that <var>type</var>
	is returned in a register; the caller is required to check this.
	</p>
	<p>Note that the register provided by <code>TARGET_FUNCTION_VALUE</code> must
	be able to hold the complete return value. For example, if a 1-, 2-
	or 3-byte structure is returned at the most significant end of a
	4-byte register, <code>TARGET_FUNCTION_VALUE</code> should provide an
	<code>SImode</code> rtx.
	</p></dd></dl>

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	Next: <a href="Aggregate-Return.html#Aggregate-Return" accesskey="n" rel="next">Aggregate Return</a>, Previous: <a href="Register-Arguments.html#Register-Arguments" accesskey="p" rel="prev">Register Arguments</a>, Up: <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="u" rel="up">Stack and Calling</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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