| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1988-2015 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 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Using the GNU Compiler Collection (GCC): picoChip Options</title> |
| |
| <meta name="description" content="Using the GNU Compiler Collection (GCC): picoChip Options"> |
| <meta name="keywords" content="Using the GNU Compiler Collection (GCC): picoChip Options"> |
| <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="Option-Index.html#Option-Index" rel="index" title="Option Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options"> |
| <link href="PowerPC-Options.html#PowerPC-Options" rel="next" title="PowerPC Options"> |
| <link href="PDP_002d11-Options.html#PDP_002d11-Options" rel="prev" title="PDP-11 Options"> |
| <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="picoChip-Options"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="PowerPC-Options.html#PowerPC-Options" accesskey="n" rel="next">PowerPC Options</a>, Previous: <a href="PDP_002d11-Options.html#PDP_002d11-Options" accesskey="p" rel="prev">PDP-11 Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</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="picoChip-Options-1"></a> |
| <h4 class="subsection">3.17.35 picoChip Options</h4> |
| <a name="index-picoChip-options"></a> |
| |
| <p>These ‘<samp>-m</samp>’ options are defined for picoChip implementations: |
| </p> |
| <dl compact="compact"> |
| <dt><code>-mae=<var>ae_type</var></code></dt> |
| <dd><a name="index-mcpu-8"></a> |
| <p>Set the instruction set, register set, and instruction scheduling |
| parameters for array element type <var>ae_type</var>. Supported values |
| for <var>ae_type</var> are ‘<samp>ANY</samp>’, ‘<samp>MUL</samp>’, and ‘<samp>MAC</samp>’. |
| </p> |
| <p><samp>-mae=ANY</samp> selects a completely generic AE type. Code |
| generated with this option runs on any of the other AE types. The |
| code is not as efficient as it would be if compiled for a specific |
| AE type, and some types of operation (e.g., multiplication) do not |
| work properly on all types of AE. |
| </p> |
| <p><samp>-mae=MUL</samp> selects a MUL AE type. This is the most useful AE type |
| for compiled code, and is the default. |
| </p> |
| <p><samp>-mae=MAC</samp> selects a DSP-style MAC AE. Code compiled with this |
| option may suffer from poor performance of byte (char) manipulation, |
| since the DSP AE does not provide hardware support for byte load/stores. |
| </p> |
| </dd> |
| <dt><code>-msymbol-as-address</code></dt> |
| <dd><p>Enable the compiler to directly use a symbol name as an address in a |
| load/store instruction, without first loading it into a |
| register. Typically, the use of this option generates larger |
| programs, which run faster than when the option isn’t used. However, the |
| results vary from program to program, so it is left as a user option, |
| rather than being permanently enabled. |
| </p> |
| </dd> |
| <dt><code>-mno-inefficient-warnings</code></dt> |
| <dd><p>Disables warnings about the generation of inefficient code. These |
| warnings can be generated, for example, when compiling code that |
| performs byte-level memory operations on the MAC AE type. The MAC AE has |
| no hardware support for byte-level memory operations, so all byte |
| load/stores must be synthesized from word load/store operations. This is |
| inefficient and a warning is generated to indicate |
| that you should rewrite the code to avoid byte operations, or to target |
| an AE type that has the necessary hardware support. This option disables |
| these warnings. |
| </p> |
| </dd> |
| </dl> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| Next: <a href="PowerPC-Options.html#PowerPC-Options" accesskey="n" rel="next">PowerPC Options</a>, Previous: <a href="PDP_002d11-Options.html#PDP_002d11-Options" accesskey="p" rel="prev">PDP-11 Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</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> |
| |
| |
| |
| </body> |
| </html> |
