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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  15. A GNU Manual

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  23. <head>

  24. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  25. <title>picoChip Options (Using the GNU Compiler Collection (GCC))</title>

  26. 

  27. <meta name="description" content="picoChip Options (Using the GNU Compiler Collection (GCC))">

  28. <meta name="keywords" content="picoChip Options (Using the GNU Compiler Collection (GCC))">

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  32. <link href="index.html#Top" rel="start" title="Top">

  33. <link href="Option-Index.html#Option-Index" rel="index" title="Option Index">

  34. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  35. <link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options">

  36. <link href="PowerPC-Options.html#PowerPC-Options" rel="next" title="PowerPC Options">

  37. <link href="PDP_002d11-Options.html#PDP_002d11-Options" rel="prev" title="PDP-11 Options">

  38. <style type="text/css">

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  67. </head>

  68. 

  69. <body lang="en">

  70. <a name="picoChip-Options"></a>

  71. <div class="header">

  72. <p>

  73. 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> &nbsp; [<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>

  74. </div>

  75. <hr>

  76. <a name="picoChip-Options-1"></a>

  77. <h4 class="subsection">3.19.39 picoChip Options</h4>

  78. <a name="index-picoChip-options"></a>

  79. 

  80. <p>These &lsquo;<samp>-m</samp>&rsquo; options are defined for picoChip implementations:

  81. </p>

  82. <dl compact="compact">

  83. <dt><code>-mae=<var>ae_type</var></code></dt>

  84. <dd><a name="index-mcpu-7"></a>

  85. <p>Set the instruction set, register set, and instruction scheduling

  86. parameters for array element type <var>ae_type</var>.  Supported values

  87. for <var>ae_type</var> are &lsquo;<samp>ANY</samp>&rsquo;, &lsquo;<samp>MUL</samp>&rsquo;, and &lsquo;<samp>MAC</samp>&rsquo;.

  88. </p>

  89. <p><samp>-mae=ANY</samp> selects a completely generic AE type.  Code

  90. generated with this option runs on any of the other AE types.  The

  91. code is not as efficient as it would be if compiled for a specific

  92. AE type, and some types of operation (e.g., multiplication) do not

  93. work properly on all types of AE.

  94. </p>

  95. <p><samp>-mae=MUL</samp> selects a MUL AE type.  This is the most useful AE type

  96. for compiled code, and is the default.

  97. </p>

  98. <p><samp>-mae=MAC</samp> selects a DSP-style MAC AE.  Code compiled with this

  99. option may suffer from poor performance of byte (char) manipulation,

  100. since the DSP AE does not provide hardware support for byte load/stores.

  101. </p>

  102. </dd>

  103. <dt><code>-msymbol-as-address</code></dt>

  104. <dd><p>Enable the compiler to directly use a symbol name as an address in a

  105. load/store instruction, without first loading it into a

  106. register.  Typically, the use of this option generates larger

  107. programs, which run faster than when the option isn&rsquo;t used.  However, the

  108. results vary from program to program, so it is left as a user option,

  109. rather than being permanently enabled.

  110. </p>

  111. </dd>

  112. <dt><code>-mno-inefficient-warnings</code></dt>

  113. <dd><p>Disables warnings about the generation of inefficient code.  These

  114. warnings can be generated, for example, when compiling code that

  115. performs byte-level memory operations on the MAC AE type.  The MAC AE has

  116. no hardware support for byte-level memory operations, so all byte

  117. load/stores must be synthesized from word load/store operations.  This is

  118. inefficient and a warning is generated to indicate

  119. that you should rewrite the code to avoid byte operations, or to target

  120. an AE type that has the necessary hardware support.  This option disables

  121. these warnings.

  122. </p>

  123. </dd>

  124. </dl>

  125. 

  126. <hr>

  127. <div class="header">

  128. <p>

  129. 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> &nbsp; [<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>

  130. </div>

  131. 

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  134. </body>

  135. </html>