| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991-2013 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 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". |
| --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Using as: M32R-Warnings</title> |
| |
| <meta name="description" content="Using as: M32R-Warnings"> |
| <meta name="keywords" content="Using as: M32R-Warnings"> |
| <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="AS-Index.html#AS-Index" rel="index" title="AS Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="M32R_002dDependent.html#M32R_002dDependent" rel="up" title="M32R-Dependent"> |
| <link href="M68K_002dDependent.html#M68K_002dDependent" rel="next" title="M68K-Dependent"> |
| <link href="M32R_002dDirectives.html#M32R_002dDirectives" rel="prev" title="M32R-Directives"> |
| <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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="M32R_002dWarnings"></a> |
| <div class="header"> |
| <p> |
| Previous: <a href="M32R_002dDirectives.html#M32R_002dDirectives" accesskey="p" rel="prev">M32R-Directives</a>, Up: <a href="M32R_002dDependent.html#M32R_002dDependent" accesskey="u" rel="up">M32R-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
| </div> |
| <hr> |
| <a name="M32R-Warnings"></a> |
| <h4 class="subsection">9.22.3 M32R Warnings</h4> |
| |
| <a name="index-warnings_002c-M32R"></a> |
| <a name="index-M32R-warnings"></a> |
| |
| <p>There are several warning and error messages that can be produced by |
| <code>as</code> which are specific to the M32R: |
| </p> |
| <dl compact="compact"> |
| <dt><code>output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?</code></dt> |
| <dd><p>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 |
| ‘<samp>mv r1, r2 || neg r3, r1</samp>’ register r1 is the destination of the |
| move instruction and the input to the neg instruction. |
| </p> |
| </dd> |
| <dt><code>output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?</code></dt> |
| <dd><p>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 |
| ‘<samp>mv r1, r2 || neg r2, r3</samp>’ register r2 is the destination of the |
| neg instruction and the input to the move instruction. |
| </p> |
| </dd> |
| <dt><code>instruction ‘<samp>...</samp>’ is for the M32RX only</code></dt> |
| <dd><p>This message is produced when the assembler encounters an instruction |
| which is only supported by the M32Rx processor, and the ‘<samp>-m32rx</samp>’ |
| command line flag has not been specified to allow assembly of such |
| instructions. |
| </p> |
| </dd> |
| <dt><code>unknown instruction ‘<samp>...</samp>’</code></dt> |
| <dd><p>This message is produced when the assembler encounters an instruction |
| which it does not recognize. |
| </p> |
| </dd> |
| <dt><code>only the NOP instruction can be issued in parallel on the m32r</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction which does not involve a NOP instruction and the |
| ‘<samp>-m32rx</samp>’ command line flag has not been specified. Only the M32Rx |
| processor is able to execute two instructions in parallel. |
| </p> |
| </dd> |
| <dt><code>instruction ‘<samp>...</samp>’ cannot be executed in parallel.</code></dt> |
| <dd><p>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. |
| </p> |
| </dd> |
| <dt><code>Instructions share the same execution pipeline</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction whoes components both use the same execution pipeline. |
| </p> |
| </dd> |
| <dt><code>Instructions write to the same destination register.</code></dt> |
| <dd><p>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: |
| ‘<samp>mv r1, r2 || neg r1, r3</samp>’ |
| ‘<samp>jl r0 || mv r14, r1</samp>’ |
| ‘<samp>st r2, @-r1 || mv r1, r3</samp>’ |
| ‘<samp>mv r1, r2 || ld r0, @r1+</samp>’ |
| ‘<samp>cmp r1, r2 || addx r3, r4</samp>’ (Both write to the condition bit) |
| </p> |
| </dd> |
| </dl> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| Previous: <a href="M32R_002dDirectives.html#M32R_002dDirectives" accesskey="p" rel="prev">M32R-Directives</a>, Up: <a href="M32R_002dDependent.html#M32R_002dDependent" accesskey="u" rel="up">M32R-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
