61 lines
2.8 KiB
HTML
61 lines
2.8 KiB
HTML
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<html lang="en">
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<head>
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<title>MIPS FP ABI History - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" title="MIPS FP ABIs">
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<link rel="next" href="MIPS-FP-ABI-Variants.html#MIPS-FP-ABI-Variants" title="MIPS FP ABI Variants">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="MIPS-FP-ABI-History"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="MIPS-FP-ABI-Variants.html#MIPS-FP-ABI-Variants">MIPS FP ABI Variants</a>,
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Up: <a rel="up" accesskey="u" href="MIPS-FP-ABIs.html#MIPS-FP-ABIs">MIPS FP ABIs</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.27.9.1 History of FP ABIs</h5>
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<p><a name="index-g_t_0040code_007b_002egnu_005fattribute-4_002c-_0040var_007bn_007d_007d-directive_002c-MIPS-1593"></a><a name="index-g_t_0040code_007b_002egnu_005fattribute-Tag_005fGNU_005fMIPS_005fABI_005fFP_002c-_0040var_007bn_007d_007d-directive_002c-MIPS-1594"></a>The MIPS ABIs support a variety of different floating-point extensions
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where calling-convention and register sizes vary for floating-point data.
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The extensions exist to support a wide variety of optional architecture
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features. The resulting ABI variants are generally incompatible with each
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other and must be tracked carefully.
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<p>Traditionally the use of an explicit <code>.gnu_attribute 4, </code><var>n</var>
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directive is used to indicate which ABI is in use by a specific module.
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It was then left to the user to ensure that command-line options and the
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selected ABI were compatible with some potential for inconsistencies.
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</body></html>
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