📄 s-390-and-zseries-options.html
字号:
<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="S%2f390%20and%20zSeries%20Options">S/390 and zSeries Options</a>,Next: <a rel="next" accesskey="n" href="CRIS-Options.html#CRIS%20Options">CRIS Options</a>,Previous: <a rel="previous" accesskey="p" href="IA-64-Options.html#IA-64%20Options">IA-64 Options</a>,Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">S/390 and zSeries Options</h4><p>These are the <code>-m</code> options defined for the S/390 and zSeries architecture. <dl><dt><code>-mhard-float</code> <dd><dt><code>-msoft-float</code> <dd>Use (do not use) the hardware floating-point instructions and registersfor floating-point operations. When <code>-msoft-float</code> is specified,functions in <code>libgcc.a</code> will be used to perform floating-pointoperations. When <code>-mhard-float</code> is specified, the compilergenerates IEEE floating-point instructions. This is the default. <br><dt><code>-mbackchain</code> <dd><dt><code>-mno-backchain</code> <dd>Generate (or do not generate) code which maintains an explicitbackchain within the stack frame that points to the caller's frame. This may be needed to allow debugging using tools that do not understandDWARF-2 call frame information. The default is not to generate thebackchain. <br><dt><code>-msmall-exec</code> <dd><dt><code>-mno-small-exec</code> <dd>Generate (or do not generate) code using the <code>bras</code> instructionto do subroutine calls. This only works reliably if the total executable size does notexceed 64k. The default is to use the <code>basr</code> instruction instead,which does not have this limitation. <br><dt><code>-m64</code> <dd><dt><code>-m31</code> <dd>When <code>-m31</code> is specified, generate code compliant to theGNU/Linux for S/390 ABI. When <code>-m64</code> is specified, generatecode compliant to the GNU/Linux for zSeries ABI. This allows GCC inparticular to generate 64-bit instructions. For the <code>s390</code>targets, the default is <code>-m31</code>, while the <code>s390x</code>targets default to <code>-m64</code>. <br><dt><code>-mzarch</code> <dd><dt><code>-mesa</code> <dd>When <code>-mzarch</code> is specified, generate code using theinstructions available on z/Architecture. When <code>-mesa</code> is specified, generate code using theinstructions available on ESA/390. Note that <code>-mesa</code> isnot possible with <code>-m64</code>. When generating code compliant to the GNU/Linux for S/390 ABI,the default is <code>-mesa</code>. When generating code compliantto the GNU/Linux for zSeries ABI, the default is <code>-mzarch</code>. <br><dt><code>-mmvcle</code> <dd><dt><code>-mno-mvcle</code> <dd>Generate (or do not generate) code using the <code>mvcle</code> instructionto perform block moves. When <code>-mno-mvcle</code> is specified,use a <code>mvc</code> loop instead. This is the default. <br><dt><code>-mdebug</code> <dd><dt><code>-mno-debug</code> <dd>Print (or do not print) additional debug information when compiling. The default is to not print debug information. <br><dt><code>-march=</code><var>cpu-type</var><code></code> <dd>Generate code that will run on <var>cpu-type</var>, which is the name of a systemrepresenting a certain processor type. Possible values for<var>cpu-type</var> are <code>g5</code>, <code>g6</code>, <code>z900</code>, and <code>z990</code>. When generating code using the instructions available on z/Architecture,the default is <code>-march=z900</code>. Otherwise, the default is<code>-march=g5</code>. <br><dt><code>-mtune=</code><var>cpu-type</var><code></code> <dd>Tune to <var>cpu-type</var> everything applicable about the generated code,except for the ABI and the set of available instructions. The list of <var>cpu-type</var> values is the same as for <code>-march</code>. The default is the value used for <code>-march</code>. <br><dt><code>-mfused-madd</code> <dd><dt><code>-mno-fused-madd</code> <dd>Generate code that uses (does not use) the floating point multiply andaccumulate instructions. These instructions are generated by default ifhardware floating point is used. </dl> </body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -