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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/gcc/C_002dSKY-Options.html

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  25. <title>C-SKY Options (Using the GNU Compiler Collection (GCC))</title>

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  35. <link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options">

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  68. 

  69. <body lang="en">

  70. <a name="C_002dSKY-Options"></a>

  71. <div class="header">

  72. <p>

  73. Next: <a href="Darwin-Options.html#Darwin-Options" accesskey="n" rel="next">Darwin Options</a>, Previous: <a href="CR16-Options.html#CR16-Options" accesskey="p" rel="prev">CR16 Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>

  74. </div>

  75. <hr>

  76. <a name="C_002dSKY-Options-1"></a>

  77. <h4 class="subsection">3.19.11 C-SKY Options</h4>

  78. <a name="index-C_002dSKY-Options"></a>

  79. 

  80. <p>GCC supports these options when compiling for C-SKY V2 processors.

  81. </p>

  82. <dl compact="compact">

  83. <dt><code>-march=<var>arch</var></code></dt>

  84. <dd><a name="index-march_003d"></a>

  85. <p>Specify the C-SKY target architecture.  Valid values for <var>arch</var> are:

  86. &lsquo;<samp>ck801</samp>&rsquo;, &lsquo;<samp>ck802</samp>&rsquo;, &lsquo;<samp>ck803</samp>&rsquo;, &lsquo;<samp>ck807</samp>&rsquo;, and &lsquo;<samp>ck810</samp>&rsquo;.

  87. The default is &lsquo;<samp>ck810</samp>&rsquo;.

  88. </p>

  89. </dd>

  90. <dt><code>-mcpu=<var>cpu</var></code></dt>

  91. <dd><a name="index-mcpu_003d-1"></a>

  92. <p>Specify the C-SKY target processor.  Valid values for <var>cpu</var> are:

  93. &lsquo;<samp>ck801</samp>&rsquo;, &lsquo;<samp>ck801t</samp>&rsquo;,

  94. &lsquo;<samp>ck802</samp>&rsquo;, &lsquo;<samp>ck802t</samp>&rsquo;, &lsquo;<samp>ck802j</samp>&rsquo;,

  95. &lsquo;<samp>ck803</samp>&rsquo;, &lsquo;<samp>ck803h</samp>&rsquo;, &lsquo;<samp>ck803t</samp>&rsquo;, &lsquo;<samp>ck803ht</samp>&rsquo;,

  96. &lsquo;<samp>ck803f</samp>&rsquo;, &lsquo;<samp>ck803fh</samp>&rsquo;, &lsquo;<samp>ck803e</samp>&rsquo;, &lsquo;<samp>ck803eh</samp>&rsquo;,

  97. &lsquo;<samp>ck803et</samp>&rsquo;, &lsquo;<samp>ck803eht</samp>&rsquo;, &lsquo;<samp>ck803ef</samp>&rsquo;, &lsquo;<samp>ck803efh</samp>&rsquo;,

  98. &lsquo;<samp>ck803ft</samp>&rsquo;, &lsquo;<samp>ck803eft</samp>&rsquo;, &lsquo;<samp>ck803efht</samp>&rsquo;, &lsquo;<samp>ck803r1</samp>&rsquo;,

  99. &lsquo;<samp>ck803hr1</samp>&rsquo;, &lsquo;<samp>ck803tr1</samp>&rsquo;, &lsquo;<samp>ck803htr1</samp>&rsquo;, &lsquo;<samp>ck803fr1</samp>&rsquo;,

  100. &lsquo;<samp>ck803fhr1</samp>&rsquo;, &lsquo;<samp>ck803er1</samp>&rsquo;, &lsquo;<samp>ck803ehr1</samp>&rsquo;, &lsquo;<samp>ck803etr1</samp>&rsquo;,

  101. &lsquo;<samp>ck803ehtr1</samp>&rsquo;, &lsquo;<samp>ck803efr1</samp>&rsquo;, &lsquo;<samp>ck803efhr1</samp>&rsquo;, &lsquo;<samp>ck803ftr1</samp>&rsquo;,

  102. &lsquo;<samp>ck803eftr1</samp>&rsquo;, &lsquo;<samp>ck803efhtr1</samp>&rsquo;,

  103. &lsquo;<samp>ck803s</samp>&rsquo;, &lsquo;<samp>ck803st</samp>&rsquo;, &lsquo;<samp>ck803se</samp>&rsquo;, &lsquo;<samp>ck803sf</samp>&rsquo;,

  104. &lsquo;<samp>ck803sef</samp>&rsquo;, &lsquo;<samp>ck803seft</samp>&rsquo;,

  105. &lsquo;<samp>ck807e</samp>&rsquo;, &lsquo;<samp>ck807ef</samp>&rsquo;, &lsquo;<samp>ck807</samp>&rsquo;, &lsquo;<samp>ck807f</samp>&rsquo;,

  106. &lsquo;<samp>ck810e</samp>&rsquo;, &lsquo;<samp>ck810et</samp>&rsquo;, &lsquo;<samp>ck810ef</samp>&rsquo;, &lsquo;<samp>ck810eft</samp>&rsquo;,

  107. &lsquo;<samp>ck810</samp>&rsquo;, &lsquo;<samp>ck810v</samp>&rsquo;, &lsquo;<samp>ck810f</samp>&rsquo;, &lsquo;<samp>ck810t</samp>&rsquo;, &lsquo;<samp>ck810fv</samp>&rsquo;,

  108. &lsquo;<samp>ck810tv</samp>&rsquo;, &lsquo;<samp>ck810ft</samp>&rsquo;, and &lsquo;<samp>ck810ftv</samp>&rsquo;.

  109. </p>

  110. </dd>

  111. <dt><code>-mbig-endian</code></dt>

  112. <dd><a name="index-mbig_002dendian-4"></a>

  113. </dd>

  114. <dt><code>-EB</code></dt>

  115. <dd><a name="index-EB-1"></a>

  116. </dd>

  117. <dt><code>-mlittle-endian</code></dt>

  118. <dd><a name="index-mlittle_002dendian-4"></a>

  119. </dd>

  120. <dt><code>-EL</code></dt>

  121. <dd><a name="index-EL-1"></a>

  122. 

  123. <p>Select big- or little-endian code.  The default is little-endian.

  124. </p>

  125. </dd>

  126. <dt><code>-mhard-float</code></dt>

  127. <dd><a name="index-mhard_002dfloat"></a>

  128. </dd>

  129. <dt><code>-msoft-float</code></dt>

  130. <dd><a name="index-msoft_002dfloat-1"></a>

  131. 

  132. <p>Select hardware or software floating-point implementations.

  133. The default is soft float.

  134. </p>

  135. </dd>

  136. <dt><code>-mdouble-float</code></dt>

  137. <dt><code>-mno-double-float</code></dt>

  138. <dd><a name="index-mdouble_002dfloat"></a>

  139. <p>When <samp>-mhard-float</samp> is in effect, enable generation of

  140. double-precision float instructions.  This is the default except

  141. when compiling for CK803.

  142. </p>

  143. </dd>

  144. <dt><code>-mfdivdu</code></dt>

  145. <dt><code>-mno-fdivdu</code></dt>

  146. <dd><a name="index-mfdivdu"></a>

  147. <p>When <samp>-mhard-float</samp> is in effect, enable generation of

  148. <code>frecipd</code>, <code>fsqrtd</code>, and <code>fdivd</code> instructions.

  149. This is the default except when compiling for CK803.

  150. </p>

  151. </dd>

  152. <dt><code>-mfpu=<var>fpu</var></code></dt>

  153. <dd><a name="index-mfpu_003d"></a>

  154. <p>Select the floating-point processor.  This option can only be used with

  155. <samp>-mhard-float</samp>.

  156. Values for <var>fpu</var> are

  157. &lsquo;<samp>fpv2_sf</samp>&rsquo; (equivalent to &lsquo;<samp>-mno-double-float -mno-fdivdu</samp>&rsquo;),

  158. &lsquo;<samp>fpv2</samp>&rsquo; (&lsquo;<samp>-mdouble-float -mno-divdu</samp>&rsquo;), and

  159. &lsquo;<samp>fpv2_divd</samp>&rsquo; (&lsquo;<samp>-mdouble-float -mdivdu</samp>&rsquo;).

  160. </p>

  161. </dd>

  162. <dt><code>-melrw</code></dt>

  163. <dt><code>-mno-elrw</code></dt>

  164. <dd><a name="index-melrw"></a>

  165. <p>Enable the extended <code>lrw</code> instruction.  This option defaults to on

  166. for CK801 and off otherwise.

  167. </p>

  168. </dd>

  169. <dt><code>-mistack</code></dt>

  170. <dt><code>-mno-istack</code></dt>

  171. <dd><a name="index-mistack"></a>

  172. <p>Enable interrupt stack instructions; the default is off.

  173. </p>

  174. <p>The <samp>-mistack</samp> option is required to handle the

  175. <code>interrupt</code> and <code>isr</code> function attributes

  176. (see <a href="C_002dSKY-Function-Attributes.html#C_002dSKY-Function-Attributes">C-SKY Function Attributes</a>).

  177. </p>

  178. </dd>

  179. <dt><code>-mmp</code></dt>

  180. <dd><a name="index-mmp"></a>

  181. <p>Enable multiprocessor instructions; the default is off.

  182. </p>

  183. </dd>

  184. <dt><code>-mcp</code></dt>

  185. <dd><a name="index-mcp"></a>

  186. <p>Enable coprocessor instructions; the default is off.

  187. </p>

  188. </dd>

  189. <dt><code>-mcache</code></dt>

  190. <dd><a name="index-mcache"></a>

  191. <p>Enable coprocessor instructions; the default is off.

  192. </p>

  193. </dd>

  194. <dt><code>-msecurity</code></dt>

  195. <dd><a name="index-msecurity"></a>

  196. <p>Enable C-SKY security instructions; the default is off.

  197. </p>

  198. </dd>

  199. <dt><code>-mtrust</code></dt>

  200. <dd><a name="index-mtrust"></a>

  201. <p>Enable C-SKY trust instructions; the default is off.

  202. </p>

  203. </dd>

  204. <dt><code>-mdsp</code></dt>

  205. <dd><a name="index-mdsp"></a>

  206. </dd>

  207. <dt><code>-medsp</code></dt>

  208. <dd><a name="index-medsp"></a>

  209. </dd>

  210. <dt><code>-mvdsp</code></dt>

  211. <dd><a name="index-mvdsp"></a>

  212. <p>Enable C-SKY DSP, Enhanced DSP, or Vector DSP instructions, respectively.

  213. All of these options default to off.

  214. </p>

  215. </dd>

  216. <dt><code>-mdiv</code></dt>

  217. <dt><code>-mno-div</code></dt>

  218. <dd><a name="index-mdiv"></a>

  219. <p>Generate divide instructions.  Default is off.

  220. </p>

  221. </dd>

  222. <dt><code>-msmart</code></dt>

  223. <dt><code>-mno-smart</code></dt>

  224. <dd><a name="index-msmart"></a>

  225. <p>Generate code for Smart Mode, using only registers numbered 0-7 to allow

  226. use of 16-bit instructions.  This option is ignored for CK801 where this

  227. is the required behavior, and it defaults to on for CK802.

  228. For other targets, the default is off.

  229. </p>

  230. </dd>

  231. <dt><code>-mhigh-registers</code></dt>

  232. <dt><code>-mno-high-registers</code></dt>

  233. <dd><a name="index-mhigh_002dregisters"></a>

  234. <p>Generate code using the high registers numbered 16-31.  This option

  235. is not supported on CK801, CK802, or CK803, and is enabled by default

  236. for other processors.

  237. </p>

  238. </dd>

  239. <dt><code>-manchor</code></dt>

  240. <dt><code>-mno-anchor</code></dt>

  241. <dd><a name="index-manchor"></a>

  242. <p>Generate code using global anchor symbol addresses.

  243. </p>

  244. </dd>

  245. <dt><code>-mpushpop</code></dt>

  246. <dt><code>-mno-pushpop</code></dt>

  247. <dd><a name="index-mpushpop"></a>

  248. <p>Generate code using <code>push</code> and <code>pop</code> instructions.  This option

  249. defaults to on.

  250. </p>

  251. </dd>

  252. <dt><code>-mmultiple-stld</code></dt>

  253. <dt><code>-mstm</code></dt>

  254. <dt><code>-mno-multiple-stld</code></dt>

  255. <dt><code>-mno-stm</code></dt>

  256. <dd><a name="index-mmultiple_002dstld"></a>

  257. <p>Generate code using <code>stm</code> and <code>ldm</code> instructions.  This option

  258. isn&rsquo;t supported on CK801 but is enabled by default on other processors.

  259. </p>

  260. </dd>

  261. <dt><code>-mconstpool</code></dt>

  262. <dt><code>-mno-constpool</code></dt>

  263. <dd><a name="index-mconstpool"></a>

  264. <p>Create constant pools in the compiler instead of deferring it to the

  265. assembler.  This option is the default and required for correct code

  266. generation on CK801 and CK802, and is optional on other processors.

  267. </p>

  268. </dd>

  269. <dt><code>-mstack-size</code></dt>

  270. <dt><code>-mno-stack-size</code></dt>

  271. <dd><a name="index-mstack_002dsize-1"></a>

  272. <p>Emit <code>.stack_size</code> directives for each function in the assembly

  273. output.  This option defaults to off.

  274. </p>

  275. </dd>

  276. <dt><code>-mccrt</code></dt>

  277. <dt><code>-mno-ccrt</code></dt>

  278. <dd><a name="index-mccrt"></a>

  279. <p>Generate code for the C-SKY compiler runtime instead of libgcc.  This

  280. option defaults to off.

  281. </p>

  282. </dd>

  283. <dt><code>-mbranch-cost=<var>n</var></code></dt>

  284. <dd><a name="index-mbranch_002dcost_003d"></a>

  285. <p>Set the branch costs to roughly <code>n</code> instructions.  The default is 1.

  286. </p>

  287. </dd>

  288. <dt><code>-msched-prolog</code></dt>

  289. <dt><code>-mno-sched-prolog</code></dt>

  290. <dd><a name="index-msched_002dprolog-1"></a>

  291. <p>Permit scheduling of function prologue and epilogue sequences.  Using

  292. this option can result in code that is not compliant with the C-SKY V2 ABI

  293. prologue requirements and that cannot be debugged or backtraced.

  294. It is disabled by default.

  295. </p>

  296. </dd>

  297. </dl>

  298. 

  299. <hr>

  300. <div class="header">

  301. <p>

  302. Next: <a href="Darwin-Options.html#Darwin-Options" accesskey="n" rel="next">Darwin Options</a>, Previous: <a href="CR16-Options.html#CR16-Options" accesskey="p" rel="prev">CR16 Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>

  303. </div>

  304. 

  305. 

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