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 <a name="Register-Basics"></a>
 <div class="header">
 <p>
 Next: <a href="Allocation-Order.html#Allocation-Order" accesskey="n" rel="next">Allocation Order</a>, Up: <a href="Registers.html#Registers" accesskey="u" rel="up">Registers</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="Basic-Characteristics-of-Registers"></a>
 <h4 class="subsection">17.7.1 Basic Characteristics of Registers</h4>

 <p>Registers have various characteristics.
 </p>
 <dl>
 <dt><a name="index-FIRST_005fPSEUDO_005fREGISTER"></a>Macro: <strong>FIRST_PSEUDO_REGISTER</strong></dt>
 <dd><p>Number of hardware registers known to the compiler.  They receive
 numbers 0 through <code>FIRST_PSEUDO_REGISTER-1</code>; thus, the first
 pseudo register&rsquo;s number really is assigned the number
 <code>FIRST_PSEUDO_REGISTER</code>.
 </p></dd></dl>

 <dl>
 <dt><a name="index-FIXED_005fREGISTERS"></a>Macro: <strong>FIXED_REGISTERS</strong></dt>
 <dd><a name="index-fixed-register"></a>
 <p>An initializer that says which registers are used for fixed purposes
 all throughout the compiled code and are therefore not available for
 general allocation.  These would include the stack pointer, the frame
 pointer (except on machines where that can be used as a general
 register when no frame pointer is needed), the program counter on
 machines where that is considered one of the addressable registers,
 and any other numbered register with a standard use.
 </p>
 <p>This information is expressed as a sequence of numbers, separated by
 commas and surrounded by braces.  The <var>n</var>th number is 1 if
 register <var>n</var> is fixed, 0 otherwise.
 </p>
 <p>The table initialized from this macro, and the table initialized by
 the following one, may be overridden at run time either automatically,
 by the actions of the macro <code>CONDITIONAL_REGISTER_USAGE</code>, or by
 the user with the command options <samp>-ffixed-<var>reg</var></samp>,
 <samp>-fcall-used-<var>reg</var></samp> and <samp>-fcall-saved-<var>reg</var></samp>.
 </p></dd></dl>

 <dl>
 <dt><a name="index-CALL_005fUSED_005fREGISTERS"></a>Macro: <strong>CALL_USED_REGISTERS</strong></dt>
 <dd><a name="index-call_002dused-register"></a>
 <a name="index-call_002dclobbered-register"></a>
 <a name="index-call_002dsaved-register"></a>
 <p>Like <code>FIXED_REGISTERS</code> but has 1 for each register that is
 clobbered (in general) by function calls as well as for fixed
 registers.  This macro therefore identifies the registers that are not
 available for general allocation of values that must live across
 function calls.
 </p>
 <p>If a register has 0 in <code>CALL_USED_REGISTERS</code>, the compiler
 automatically saves it on function entry and restores it on function
 exit, if the register is used within the function.
 </p></dd></dl>

 <dl>
 <dt><a name="index-CALL_005fREALLY_005fUSED_005fREGISTERS"></a>Macro: <strong>CALL_REALLY_USED_REGISTERS</strong></dt>
 <dd><a name="index-call_002dused-register-1"></a>
 <a name="index-call_002dclobbered-register-1"></a>
 <a name="index-call_002dsaved-register-1"></a>
 <p>Like <code>CALL_USED_REGISTERS</code> except this macro doesn&rsquo;t require
 that the entire set of <code>FIXED_REGISTERS</code> be included.
 (<code>CALL_USED_REGISTERS</code> must be a superset of <code>FIXED_REGISTERS</code>).
 This macro is optional.  If not specified, it defaults to the value
 of <code>CALL_USED_REGISTERS</code>.
 </p></dd></dl>

 <dl>
 <dt><a name="index-HARD_005fREGNO_005fCALL_005fPART_005fCLOBBERED"></a>Macro: <strong>HARD_REGNO_CALL_PART_CLOBBERED</strong> <em>(<var>regno</var>, <var>mode</var>)</em></dt>
 <dd><a name="index-call_002dused-register-2"></a>
 <a name="index-call_002dclobbered-register-2"></a>
 <a name="index-call_002dsaved-register-2"></a>
 <p>A C expression that is nonzero if it is not permissible to store a
 value of mode <var>mode</var> in hard register number <var>regno</var> across a
 call without some part of it being clobbered.  For most machines this
 macro need not be defined.  It is only required for machines that do not
 preserve the entire contents of a register across a call.
 </p></dd></dl>

 <a name="index-fixed_005fregs"></a>
 <a name="index-call_005fused_005fregs"></a>
 <a name="index-global_005fregs"></a>
 <a name="index-reg_005fnames"></a>
 <a name="index-reg_005fclass_005fcontents"></a>
 <dl>
 <dt><a name="index-TARGET_005fCONDITIONAL_005fREGISTER_005fUSAGE"></a>Target Hook: <em>void</em> <strong>TARGET_CONDITIONAL_REGISTER_USAGE</strong> <em>(void)</em></dt>
 <dd><p>This hook may conditionally modify five variables
 <code>fixed_regs</code>, <code>call_used_regs</code>, <code>global_regs</code>,
 <code>reg_names</code>, and <code>reg_class_contents</code>, to take into account
 any dependence of these register sets on target flags.  The first three
 of these are of type <code>char []</code> (interpreted as Boolean vectors).
 <code>global_regs</code> is a <code>const char *[]</code>, and
 <code>reg_class_contents</code> is a <code>HARD_REG_SET</code>.  Before the macro is
 called, <code>fixed_regs</code>, <code>call_used_regs</code>,
 <code>reg_class_contents</code>, and <code>reg_names</code> have been initialized
 from <code>FIXED_REGISTERS</code>, <code>CALL_USED_REGISTERS</code>,
 <code>REG_CLASS_CONTENTS</code>, and <code>REGISTER_NAMES</code>, respectively.
 <code>global_regs</code> has been cleared, and any <samp>-ffixed-<var>reg</var></samp>,
 <samp>-fcall-used-<var>reg</var></samp> and <samp>-fcall-saved-<var>reg</var></samp>
 command options have been applied.
 </p>
 <a name="index-disabling-certain-registers"></a>
 <a name="index-controlling-register-usage"></a>
 <p>If the usage of an entire class of registers depends on the target
 flags, you may indicate this to GCC by using this macro to modify
 <code>fixed_regs</code> and <code>call_used_regs</code> to 1 for each of the
 registers in the classes which should not be used by GCC.  Also define
 the macro <code>REG_CLASS_FROM_LETTER</code> / <code>REG_CLASS_FROM_CONSTRAINT</code>
 to return <code>NO_REGS</code> if it
 is called with a letter for a class that shouldn&rsquo;t be used.
 </p>
 <p>(However, if this class is not included in <code>GENERAL_REGS</code> and all
 of the insn patterns whose constraints permit this class are
 controlled by target switches, then GCC will automatically avoid using
 these registers when the target switches are opposed to them.)
 </p></dd></dl>

 <dl>
 <dt><a name="index-INCOMING_005fREGNO"></a>Macro: <strong>INCOMING_REGNO</strong> <em>(<var>out</var>)</em></dt>
 <dd><p>Define this macro if the target machine has register windows.  This C
 expression returns the register number as seen by the called function
 corresponding to the register number <var>out</var> as seen by the calling
 function.  Return <var>out</var> if register number <var>out</var> is not an
 outbound register.
 </p></dd></dl>

 <dl>
 <dt><a name="index-OUTGOING_005fREGNO"></a>Macro: <strong>OUTGOING_REGNO</strong> <em>(<var>in</var>)</em></dt>
 <dd><p>Define this macro if the target machine has register windows.  This C
 expression returns the register number as seen by the calling function
 corresponding to the register number <var>in</var> as seen by the called
 function.  Return <var>in</var> if register number <var>in</var> is not an inbound
 register.
 </p></dd></dl>

 <dl>
 <dt><a name="index-LOCAL_005fREGNO"></a>Macro: <strong>LOCAL_REGNO</strong> <em>(<var>regno</var>)</em></dt>
 <dd><p>Define this macro if the target machine has register windows.  This C
 expression returns true if the register is call-saved but is in the
 register window.  Unlike most call-saved registers, such registers
 need not be explicitly restored on function exit or during non-local
 gotos.
 </p></dd></dl>

 <dl>
 <dt><a name="index-PC_005fREGNUM"></a>Macro: <strong>PC_REGNUM</strong></dt>
 <dd><p>If the program counter has a register number, define this as that
 register number.  Otherwise, do not define it.
 </p></dd></dl>

 <hr>
 <div class="header">
 <p>
 Next: <a href="Allocation-Order.html#Allocation-Order" accesskey="n" rel="next">Allocation Order</a>, Up: <a href="Registers.html#Registers" accesskey="u" rel="up">Registers</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="Register-Basics"></a>
	<div class="header">
	<p>
	Next: <a href="Allocation-Order.html#Allocation-Order" accesskey="n" rel="next">Allocation Order</a>, Up: <a href="Registers.html#Registers" accesskey="u" rel="up">Registers</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="Basic-Characteristics-of-Registers"></a>
	<h4 class="subsection">17.7.1 Basic Characteristics of Registers</h4>

	<p>Registers have various characteristics.
	</p>
	<dl>
	<dt><a name="index-FIRST_005fPSEUDO_005fREGISTER"></a>Macro: <strong>FIRST_PSEUDO_REGISTER</strong></dt>
	<dd><p>Number of hardware registers known to the compiler. They receive
	numbers 0 through <code>FIRST_PSEUDO_REGISTER-1</code>; thus, the first
	pseudo register’s number really is assigned the number
	<code>FIRST_PSEUDO_REGISTER</code>.
	</p></dd></dl>

	<dl>
	<dt><a name="index-FIXED_005fREGISTERS"></a>Macro: <strong>FIXED_REGISTERS</strong></dt>
	<dd><a name="index-fixed-register"></a>
	<p>An initializer that says which registers are used for fixed purposes
	all throughout the compiled code and are therefore not available for
	general allocation. These would include the stack pointer, the frame
	pointer (except on machines where that can be used as a general
	register when no frame pointer is needed), the program counter on
	machines where that is considered one of the addressable registers,
	and any other numbered register with a standard use.
	</p>
	<p>This information is expressed as a sequence of numbers, separated by
	commas and surrounded by braces. The <var>n</var>th number is 1 if
	register <var>n</var> is fixed, 0 otherwise.
	</p>
	<p>The table initialized from this macro, and the table initialized by
	the following one, may be overridden at run time either automatically,
	by the actions of the macro <code>CONDITIONAL_REGISTER_USAGE</code>, or by
	the user with the command options <samp>-ffixed-<var>reg</var></samp>,
	<samp>-fcall-used-<var>reg</var></samp> and <samp>-fcall-saved-<var>reg</var></samp>.
	</p></dd></dl>

	<dl>
	<dt><a name="index-CALL_005fUSED_005fREGISTERS"></a>Macro: <strong>CALL_USED_REGISTERS</strong></dt>
	<dd><a name="index-call_002dused-register"></a>
	<a name="index-call_002dclobbered-register"></a>
	<a name="index-call_002dsaved-register"></a>
	<p>Like <code>FIXED_REGISTERS</code> but has 1 for each register that is
	clobbered (in general) by function calls as well as for fixed
	registers. This macro therefore identifies the registers that are not
	available for general allocation of values that must live across
	function calls.
	</p>
	<p>If a register has 0 in <code>CALL_USED_REGISTERS</code>, the compiler
	automatically saves it on function entry and restores it on function
	exit, if the register is used within the function.
	</p></dd></dl>

	<dl>
	<dt><a name="index-CALL_005fREALLY_005fUSED_005fREGISTERS"></a>Macro: <strong>CALL_REALLY_USED_REGISTERS</strong></dt>
	<dd><a name="index-call_002dused-register-1"></a>
	<a name="index-call_002dclobbered-register-1"></a>
	<a name="index-call_002dsaved-register-1"></a>
	<p>Like <code>CALL_USED_REGISTERS</code> except this macro doesn’t require
	that the entire set of <code>FIXED_REGISTERS</code> be included.
	(<code>CALL_USED_REGISTERS</code> must be a superset of <code>FIXED_REGISTERS</code>).
	This macro is optional. If not specified, it defaults to the value
	of <code>CALL_USED_REGISTERS</code>.
	</p></dd></dl>

	<dl>
	<dt><a name="index-HARD_005fREGNO_005fCALL_005fPART_005fCLOBBERED"></a>Macro: <strong>HARD_REGNO_CALL_PART_CLOBBERED</strong> <em>(<var>regno</var>, <var>mode</var>)</em></dt>
	<dd><a name="index-call_002dused-register-2"></a>
	<a name="index-call_002dclobbered-register-2"></a>
	<a name="index-call_002dsaved-register-2"></a>
	<p>A C expression that is nonzero if it is not permissible to store a
	value of mode <var>mode</var> in hard register number <var>regno</var> across a
	call without some part of it being clobbered. For most machines this
	macro need not be defined. It is only required for machines that do not
	preserve the entire contents of a register across a call.
	</p></dd></dl>

	<a name="index-fixed_005fregs"></a>
	<a name="index-call_005fused_005fregs"></a>
	<a name="index-global_005fregs"></a>
	<a name="index-reg_005fnames"></a>
	<a name="index-reg_005fclass_005fcontents"></a>
	<dl>
	<dt><a name="index-TARGET_005fCONDITIONAL_005fREGISTER_005fUSAGE"></a>Target Hook: <em>void</em> <strong>TARGET_CONDITIONAL_REGISTER_USAGE</strong> <em>(void)</em></dt>
	<dd><p>This hook may conditionally modify five variables
	<code>fixed_regs</code>, <code>call_used_regs</code>, <code>global_regs</code>,
	<code>reg_names</code>, and <code>reg_class_contents</code>, to take into account
	any dependence of these register sets on target flags. The first three
	of these are of type <code>char []</code> (interpreted as Boolean vectors).
	<code>global_regs</code> is a <code>const char *[]</code>, and
	<code>reg_class_contents</code> is a <code>HARD_REG_SET</code>. Before the macro is
	called, <code>fixed_regs</code>, <code>call_used_regs</code>,
	<code>reg_class_contents</code>, and <code>reg_names</code> have been initialized
	from <code>FIXED_REGISTERS</code>, <code>CALL_USED_REGISTERS</code>,
	<code>REG_CLASS_CONTENTS</code>, and <code>REGISTER_NAMES</code>, respectively.
	<code>global_regs</code> has been cleared, and any <samp>-ffixed-<var>reg</var></samp>,
	<samp>-fcall-used-<var>reg</var></samp> and <samp>-fcall-saved-<var>reg</var></samp>
	command options have been applied.
	</p>
	<a name="index-disabling-certain-registers"></a>
	<a name="index-controlling-register-usage"></a>
	<p>If the usage of an entire class of registers depends on the target
	flags, you may indicate this to GCC by using this macro to modify
	<code>fixed_regs</code> and <code>call_used_regs</code> to 1 for each of the
	registers in the classes which should not be used by GCC. Also define
	the macro <code>REG_CLASS_FROM_LETTER</code> / <code>REG_CLASS_FROM_CONSTRAINT</code>
	to return <code>NO_REGS</code> if it
	is called with a letter for a class that shouldn’t be used.
	</p>
	<p>(However, if this class is not included in <code>GENERAL_REGS</code> and all
	of the insn patterns whose constraints permit this class are
	controlled by target switches, then GCC will automatically avoid using
	these registers when the target switches are opposed to them.)
	</p></dd></dl>

	<dl>
	<dt><a name="index-INCOMING_005fREGNO"></a>Macro: <strong>INCOMING_REGNO</strong> <em>(<var>out</var>)</em></dt>
	<dd><p>Define this macro if the target machine has register windows. This C
	expression returns the register number as seen by the called function
	corresponding to the register number <var>out</var> as seen by the calling
	function. Return <var>out</var> if register number <var>out</var> is not an
	outbound register.
	</p></dd></dl>

	<dl>
	<dt><a name="index-OUTGOING_005fREGNO"></a>Macro: <strong>OUTGOING_REGNO</strong> <em>(<var>in</var>)</em></dt>
	<dd><p>Define this macro if the target machine has register windows. This C
	expression returns the register number as seen by the calling function
	corresponding to the register number <var>in</var> as seen by the called
	function. Return <var>in</var> if register number <var>in</var> is not an inbound
	register.
	</p></dd></dl>

	<dl>
	<dt><a name="index-LOCAL_005fREGNO"></a>Macro: <strong>LOCAL_REGNO</strong> <em>(<var>regno</var>)</em></dt>
	<dd><p>Define this macro if the target machine has register windows. This C
	expression returns true if the register is call-saved but is in the
	register window. Unlike most call-saved registers, such registers
	need not be explicitly restored on function exit or during non-local
	gotos.
	</p></dd></dl>

	<dl>
	<dt><a name="index-PC_005fREGNUM"></a>Macro: <strong>PC_REGNUM</strong></dt>
	<dd><p>If the program counter has a register number, define this as that
	register number. Otherwise, do not define it.
	</p></dd></dl>

	<hr>
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	Next: <a href="Allocation-Order.html#Allocation-Order" accesskey="n" rel="next">Allocation Order</a>, Up: <a href="Registers.html#Registers" accesskey="u" rel="up">Registers</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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