diff options
Diffstat (limited to 'share/doc/gcc/M32C-Function-Attributes.html')
| -rw-r--r-- | share/doc/gcc/M32C-Function-Attributes.html | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/share/doc/gcc/M32C-Function-Attributes.html b/share/doc/gcc/M32C-Function-Attributes.html new file mode 100644 index 0000000..8ef47ba --- /dev/null +++ b/share/doc/gcc/M32C-Function-Attributes.html @@ -0,0 +1,156 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): M32C Function Attributes</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): M32C Function Attributes"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): M32C Function Attributes"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes"> +<link href="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" rel="next" title="M32R/D Function Attributes"> +<link href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" rel="previous" title="IA-64 Function Attributes"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="M32C-Function-Attributes"></a> +<div class="header"> +<p> +Next: <a href="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" accesskey="n" rel="next">M32R/D Function Attributes</a>, Previous: <a href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" accesskey="p" rel="previous">IA-64 Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="M32C-Function-Attributes-1"></a> +<h4 class="subsection">6.33.13 M32C Function Attributes</h4> + +<p>These function attributes are supported by the M32C back end: +</p> +<dl compact="compact"> +<dd><a name="index-bank_005fswitch-function-attribute_002c-M32C"></a> +</dd> +<dt><code>bank_switch</code></dt> +<dd><p>When added to an interrupt handler with the M32C port, causes the +prologue and epilogue to use bank switching to preserve the registers +rather than saving them on the stack. +</p> +<a name="index-fast_005finterrupt-function-attribute_002c-M32C"></a> +</dd> +<dt><code>fast_interrupt</code></dt> +<dd><p>Use this attribute on the M32C port to indicate that the specified +function is a fast interrupt handler. This is just like the +<code>interrupt</code> attribute, except that <code>freit</code> is used to return +instead of <code>reit</code>. +</p> +<a name="index-function_005fvector-function-attribute_002c-M16C_002fM32C"></a> +</dd> +<dt><code>function_vector</code></dt> +<dd><p>On M16C/M32C targets, the <code>function_vector</code> attribute declares a +special page subroutine call function. Use of this attribute reduces +the code size by 2 bytes for each call generated to the +subroutine. The argument to the attribute is the vector number entry +from the special page vector table which contains the 16 low-order +bits of the subroutine’s entry address. Each vector table has special +page number (18 to 255) that is used in <code>jsrs</code> instructions. +Jump addresses of the routines are generated by adding 0x0F0000 (in +case of M16C targets) or 0xFF0000 (in case of M32C targets), to the +2-byte addresses set in the vector table. Therefore you need to ensure +that all the special page vector routines should get mapped within the +address range 0x0F0000 to 0x0FFFFF (for M16C) and 0xFF0000 to 0xFFFFFF +(for M32C). +</p> +<p>In the following example 2 bytes are saved for each call to +function <code>foo</code>. +</p> +<div class="smallexample"> +<pre class="smallexample">void foo (void) __attribute__((function_vector(0x18))); +void foo (void) +{ +} + +void bar (void) +{ + foo(); +} +</pre></div> + +<p>If functions are defined in one file and are called in another file, +then be sure to write this declaration in both files. +</p> +<p>This attribute is ignored for R8C target. +</p> +<a name="index-interrupt-function-attribute_002c-M32C"></a> +</dd> +<dt><code>interrupt</code></dt> +<dd><p>Use this attribute to indicate +that the specified function is an interrupt handler. The compiler generates +function entry and exit sequences suitable for use in an interrupt handler +when this attribute is present. +</p></dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" accesskey="n" rel="next">M32R/D Function Attributes</a>, Previous: <a href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" accesskey="p" rel="previous">IA-64 Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |