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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="NS32K%20Options">NS32K Options</a>,Next: <a rel="next" accesskey="n" href="AVR-Options.html#AVR%20Options">AVR Options</a>,Previous: <a rel="previous" accesskey="p" href="ARC-Options.html#ARC%20Options">ARC Options</a>,Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">NS32K Options</h4><p>These are the <code>-m</code> options defined for the 32000 series. The defaultvalues for these options depends on which style of 32000 was selected whenthe compiler was configured; the defaults for the most common choices aregiven below. <dl><dt><code>-m32032</code> <dd><dt><code>-m32032</code> <dd>Generate output for a 32032. This is the defaultwhen the compiler is configured for 32032 and 32016 based systems. <br><dt><code>-m32332</code> <dd><dt><code>-m32332</code> <dd>Generate output for a 32332. This is the defaultwhen the compiler is configured for 32332-based systems. <br><dt><code>-m32532</code> <dd><dt><code>-m32532</code> <dd>Generate output for a 32532. This is the defaultwhen the compiler is configured for 32532-based systems. <br><dt><code>-m32081</code> <dd>Generate output containing 32081 instructions for floating point. This is the default for all systems. <br><dt><code>-m32381</code> <dd>Generate output containing 32381 instructions for floating point. Thisalso implies <code>-m32081</code>. The 32381 is only compatible with the 32332and 32532 cpus. This is the default for the pc532-netbsd configuration. <br><dt><code>-mmulti-add</code> <dd>Try and generate multiply-add floating point instructions <code>polyF</code>and <code>dotF</code>. This option is only available if the <code>-m32381</code>option is in effect. Using these instructions requires changes toregister allocation which generally has a negative impact onperformance. This option should only be enabled when compiling codeparticularly likely to make heavy use of multiply-add instructions. <br><dt><code>-mnomulti-add</code> <dd>Do not try and generate multiply-add floating point instructions<code>polyF</code> and <code>dotF</code>. This is the default on all platforms. <br><dt><code>-msoft-float</code> <dd>Generate output containing library calls for floating point. <strong>Warning:</strong> the requisite libraries may not be available. <br><dt><code>-mieee-compare</code> <dd><dt><code>-mno-ieee-compare</code> <dd>Control whether or not the compiler uses IEEE floating pointcomparisons. These handle correctly the case where the result of acomparison is unordered. <strong>Warning:</strong> the requisite kernel support may not be available. <br><dt><code>-mnobitfield</code> <dd>Do not use the bit-field instructions. On some machines it is faster touse shifting and masking operations. This is the default for the pc532. <br><dt><code>-mbitfield</code> <dd>Do use the bit-field instructions. This is the default for all platformsexcept the pc532. <br><dt><code>-mrtd</code> <dd>Use a different function-calling convention, in which functionsthat take a fixed number of arguments return pop theirarguments on return with the <code>ret</code> instruction. <p>This calling convention is incompatible with the one normallyused on Unix, so you cannot use it if you need to call librariescompiled with the Unix compiler. <p>Also, you must provide function prototypes for all functions thattake variable numbers of arguments (including <code>printf</code>);otherwise incorrect code will be generated for calls to thosefunctions. <p>In addition, seriously incorrect code will result if you call afunction with too many arguments. (Normally, extra arguments areharmlessly ignored.) <p>This option takes its name from the 680x0 <code>rtd</code> instruction. <br><dt><code>-mregparam</code> <dd>Use a different function-calling convention where the first two argumentsare passed in registers. <p>This calling convention is incompatible with the one normallyused on Unix, so you cannot use it if you need to call librariescompiled with the Unix compiler. <br><dt><code>-mnoregparam</code> <dd>Do not pass any arguments in registers. This is the default for alltargets. <br><dt><code>-msb</code> <dd>It is OK to use the sb as an index register which is always loaded withzero. This is the default for the pc532-netbsd target. <br><dt><code>-mnosb</code> <dd>The sb register is not available for use or has not been initialized tozero by the run time system. This is the default for all targets exceptthe pc532-netbsd. It is also implied whenever <code>-mhimem</code> or<code>-fpic</code> is set. <br><dt><code>-mhimem</code> <dd>Many ns32000 series addressing modes use displacements of up to 512MB. If an address is above 512MB then displacements from zero can not be used. This option causes code to be generated which can be loaded above 512MB. This may be useful for operating systems or ROM code. <br><dt><code>-mnohimem</code> <dd>Assume code will be loaded in the first 512MB of virtual address space. This is the default for all platforms. </dl> </body></html>⌨️ 快捷键说明
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