<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- This file documents the GNU Assembler "as". Copyright (C) 1991-2019 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". --> <!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>MIPS FP ABI Compatibility (Using as)</title> <meta name="description" content="MIPS FP ABI Compatibility (Using as)"> <meta name="keywords" content="MIPS FP ABI Compatibility (Using as)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link href="index.html#Top" rel="start" title="Top"> <link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" rel="up" title="MIPS FP ABIs"> <link href="MIPS-NaN-Encodings.html#MIPS-NaN-Encodings" rel="next" title="MIPS NaN Encodings"> <link href="MIPS-FP-ABI-Selection.html#MIPS-FP-ABI-Selection" rel="prev" title="MIPS FP ABI Selection"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="MIPS-FP-ABI-Compatibility"></a> <div class="header"> <p> Previous: <a href="MIPS-FP-ABI-Selection.html#MIPS-FP-ABI-Selection" accesskey="p" rel="prev">MIPS FP ABI Selection</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> </div> <hr> <a name="Linking-different-FP-ABI-variants"></a> <h4 class="subsubsection">9.26.9.4 Linking different FP ABI variants</h4> <p>Modules using the default FP ABI (no floating-point) can be linked with any other (singular) FP ABI variant. </p> <p>Special compatibility support exists for O32 with the four double-precision FP ABI variants. The ‘<samp>-mfpxx</samp>’ FP ABI is specifically designed to be compatible with the standard double-precision ABI and the ‘<samp>-mfp64</samp>’ FP ABIs. This makes it desirable for O32 modules to be built as ‘<samp>-mfpxx</samp>’ to ensure the maximum compatibility with other modules produced for more specific needs. The only FP ABIs which cannot be linked together are the standard double-precision ABI and the full ‘<samp>-mfp64</samp>’ ABI with ‘<samp>-modd-spreg</samp>’. </p> </body> </html>