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88 lines
3.8 KiB
HTML
88 lines
3.8 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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<!-- 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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-->
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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>MIPS FP ABI History (Using as)</title>
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<meta name="description" content="MIPS FP ABI History (Using as)">
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<meta name="keywords" content="MIPS FP ABI History (Using as)">
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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="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" rel="up" title="MIPS FP ABIs">
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<link href="MIPS-FP-ABI-Variants.html#MIPS-FP-ABI-Variants" rel="next" title="MIPS FP ABI Variants">
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<link href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" rel="prev" title="MIPS FP ABIs">
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<style type="text/css">
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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="MIPS-FP-ABI-History"></a>
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<div class="header">
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<p>
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Next: <a href="MIPS-FP-ABI-Variants.html#MIPS-FP-ABI-Variants" accesskey="n" rel="next">MIPS FP ABI Variants</a>, Up: <a href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" accesskey="u" rel="up">MIPS FP ABIs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="History-of-FP-ABIs"></a>
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<h4 class="subsubsection">9.26.9.1 History of FP ABIs</h4>
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<a name="index-_002egnu_005fattribute-4_002c-n-directive_002c-MIPS"></a>
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<a name="index-_002egnu_005fattribute-Tag_005fGNU_005fMIPS_005fABI_005fFP_002c-n-directive_002c-MIPS"></a>
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<p>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>
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<p>Traditionally the use of an explicit <code>.gnu_attribute 4, <var>n</var></code>
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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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</p>
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</body>
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</html>
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