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136 lines
6.2 KiB
HTML
136 lines
6.2 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>picoChip Options (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="picoChip Options (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="picoChip Options (Using the GNU Compiler Collection (GCC))">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options">
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<link href="PowerPC-Options.html#PowerPC-Options" rel="next" title="PowerPC Options">
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<link href="PDP_002d11-Options.html#PDP_002d11-Options" rel="prev" title="PDP-11 Options">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="picoChip-Options"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="picoChip-Options-1"></a>
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<h4 class="subsection">3.18.35 picoChip Options</h4>
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<a name="index-picoChip-options"></a>
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<p>These ‘<samp>-m</samp>’ options are defined for picoChip implementations:
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</p>
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<dl compact="compact">
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<dt><code>-mae=<var>ae_type</var></code></dt>
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<dd><a name="index-mcpu-7"></a>
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<p>Set the instruction set, register set, and instruction scheduling
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parameters for array element type <var>ae_type</var>. Supported values
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for <var>ae_type</var> are ‘<samp>ANY</samp>’, ‘<samp>MUL</samp>’, and ‘<samp>MAC</samp>’.
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</p>
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<p><samp>-mae=ANY</samp> selects a completely generic AE type. Code
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generated with this option runs on any of the other AE types. The
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code is not as efficient as it would be if compiled for a specific
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AE type, and some types of operation (e.g., multiplication) do not
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work properly on all types of AE.
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</p>
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<p><samp>-mae=MUL</samp> selects a MUL AE type. This is the most useful AE type
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for compiled code, and is the default.
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</p>
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<p><samp>-mae=MAC</samp> selects a DSP-style MAC AE. Code compiled with this
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option may suffer from poor performance of byte (char) manipulation,
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since the DSP AE does not provide hardware support for byte load/stores.
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</p>
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</dd>
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<dt><code>-msymbol-as-address</code></dt>
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<dd><p>Enable the compiler to directly use a symbol name as an address in a
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load/store instruction, without first loading it into a
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register. Typically, the use of this option generates larger
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programs, which run faster than when the option isn’t used. However, the
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results vary from program to program, so it is left as a user option,
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rather than being permanently enabled.
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</p>
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</dd>
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<dt><code>-mno-inefficient-warnings</code></dt>
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<dd><p>Disables warnings about the generation of inefficient code. These
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warnings can be generated, for example, when compiling code that
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performs byte-level memory operations on the MAC AE type. The MAC AE has
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no hardware support for byte-level memory operations, so all byte
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load/stores must be synthesized from word load/store operations. This is
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inefficient and a warning is generated to indicate
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that you should rewrite the code to avoid byte operations, or to target
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an AE type that has the necessary hardware support. This option disables
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these warnings.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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