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99 lines
4.8 KiB
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99 lines
4.8 KiB
HTML
4 years ago
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<title>picoChip Options - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Submodel-Options.html#Submodel-Options" title="Submodel Options">
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<link rel="prev" href="PDP_002d11-Options.html#PDP_002d11-Options" title="PDP-11 Options">
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<link rel="next" href="PowerPC-Options.html#PowerPC-Options" title="PowerPC Options">
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Copyright (C) 1988-2015 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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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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</head>
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<body>
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<div class="node">
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<a name="picoChip-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="PowerPC-Options.html#PowerPC-Options">PowerPC Options</a>,
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Previous: <a rel="previous" accesskey="p" href="PDP_002d11-Options.html#PDP_002d11-Options">PDP-11 Options</a>,
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Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel-Options">Submodel Options</a>
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<hr>
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</div>
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<h4 class="subsection">3.17.34 picoChip Options</h4>
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<p><a name="index-picoChip-options-2191"></a>
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These ‘<samp><span class="samp">-m</span></samp>’ options are defined for picoChip implementations:
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<dl>
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<dt><code>-mae=</code><var>ae_type</var><dd><a name="index-mcpu-2192"></a>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><span class="samp">ANY</span></samp>’, ‘<samp><span class="samp">MUL</span></samp>’, and ‘<samp><span class="samp">MAC</span></samp>’.
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<p><samp><span class="option">-mae=ANY</span></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><samp><span class="option">-mae=MUL</span></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><samp><span class="option">-mae=MAC</span></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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<br><dt><code>-msymbol-as-address</code><dd>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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<br><dt><code>-mno-inefficient-warnings</code><dd>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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</dl>
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</body></html>
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