105 lines
5.4 KiB
HTML
105 lines
5.4 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>M32R-Warnings - Using as</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Using as">
|
||
|
|
<meta name="generator" content="makeinfo 4.7">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="M32R_002dDependent.html#M32R_002dDependent" title="M32R-Dependent">
|
||
|
|
<link rel="prev" href="M32R_002dDirectives.html#M32R_002dDirectives" title="M32R-Directives">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
|
||
|
|
2006, 2007 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 1.1
|
||
|
|
or any later version published by the Free Software Foundation;
|
||
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
||
|
|
Back-Cover Texts. A copy of the license is included in the
|
||
|
|
section entitled ``GNU Free Documentation License''.
|
||
|
|
|
||
|
|
man end-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family: serif; font-weight: normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<p>
|
||
|
|
<a name="M32R_002dWarnings"></a>Previous: <a rel="previous" accesskey="p" href="M32R_002dDirectives.html#M32R_002dDirectives">M32R-Directives</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="M32R_002dDependent.html#M32R_002dDependent">M32R-Dependent</a>
|
||
|
|
<hr><br>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">9.19.3 M32R Warnings</h4>
|
||
|
|
|
||
|
|
<p><a name="index-warnings_002c-M32R-1082"></a><a name="index-M32R-warnings-1083"></a>
|
||
|
|
There are several warning and error messages that can be produced by
|
||
|
|
<code>as</code> which are specific to the M32R:
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?</code><dd>This message is only produced if warnings for explicit parallel
|
||
|
|
conflicts have been enabled. It indicates that the assembler has
|
||
|
|
encountered a parallel instruction in which the destination register of
|
||
|
|
the left hand instruction is used as an input register in the right hand
|
||
|
|
instruction. For example in this code fragment
|
||
|
|
<span class="samp">mv r1, r2 || neg r3, r1</span> register r1 is the destination of the
|
||
|
|
move instruction and the input to the neg instruction.
|
||
|
|
|
||
|
|
<br><dt><code>output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?</code><dd>This message is only produced if warnings for explicit parallel
|
||
|
|
conflicts have been enabled. It indicates that the assembler has
|
||
|
|
encountered a parallel instruction in which the destination register of
|
||
|
|
the right hand instruction is used as an input register in the left hand
|
||
|
|
instruction. For example in this code fragment
|
||
|
|
<span class="samp">mv r1, r2 || neg r2, r3</span> register r2 is the destination of the
|
||
|
|
neg instruction and the input to the move instruction.
|
||
|
|
|
||
|
|
<br><dt><code>instruction </code><span class="samp">...</span><code> is for the M32RX only</code><dd>This message is produced when the assembler encounters an instruction
|
||
|
|
which is only supported by the M32Rx processor, and the <span class="samp">-m32rx</span>
|
||
|
|
command line flag has not been specified to allow assembly of such
|
||
|
|
instructions.
|
||
|
|
|
||
|
|
<br><dt><code>unknown instruction </code><span class="samp">...</span><dd>This message is produced when the assembler encounters an instruction
|
||
|
|
which it does not recognize.
|
||
|
|
|
||
|
|
<br><dt><code>only the NOP instruction can be issued in parallel on the m32r</code><dd>This message is produced when the assembler encounters a parallel
|
||
|
|
instruction which does not involve a NOP instruction and the
|
||
|
|
<span class="samp">-m32rx</span> command line flag has not been specified. Only the M32Rx
|
||
|
|
processor is able to execute two instructions in parallel.
|
||
|
|
|
||
|
|
<br><dt><code>instruction </code><span class="samp">...</span><code> cannot be executed in parallel.</code><dd>This message is produced when the assembler encounters a parallel
|
||
|
|
instruction which is made up of one or two instructions which cannot be
|
||
|
|
executed in parallel.
|
||
|
|
|
||
|
|
<br><dt><code>Instructions share the same execution pipeline</code><dd>This message is produced when the assembler encounters a parallel
|
||
|
|
instruction whoes components both use the same execution pipeline.
|
||
|
|
|
||
|
|
<br><dt><code>Instructions write to the same destination register.</code><dd>This message is produced when the assembler encounters a parallel
|
||
|
|
instruction where both components attempt to modify the same register.
|
||
|
|
For example these code fragments will produce this message:
|
||
|
|
<span class="samp">mv r1, r2 || neg r1, r3</span>
|
||
|
|
<span class="samp">jl r0 || mv r14, r1</span>
|
||
|
|
<span class="samp">st r2, @-r1 || mv r1, r3</span>
|
||
|
|
<span class="samp">mv r1, r2 || ld r0, @r1+</span>
|
||
|
|
<span class="samp">cmp r1, r2 || addx r3, r4</span> (Both write to the condition bit)
|
||
|
|
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<!-- Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000, 2003, -->
|
||
|
|
<!-- 2004 Free Software Foundation, Inc. -->
|
||
|
|
<!-- This is part of the GAS manual. -->
|
||
|
|
<!-- For copying conditions, see the file as.texinfo. -->
|
||
|
|
</body></html>
|
||
|
|
|