{"id":15789,"date":"2024-11-18T15:44:07","date_gmt":"2024-11-18T07:44:07","guid":{"rendered":"https:\/\/fwq.ai\/blog\/15789\/"},"modified":"2024-11-18T15:44:07","modified_gmt":"2024-11-18T07:44:07","slug":"linux%e4%b8%8b%e4%bd%bf%e7%94%a8gcc%e8%bf%9b%e8%a1%8c%e5%b5%8c%e5%85%a5%e5%bc%8farm%e6%b1%87%e7%bc%96%e4%bc%98%e5%8c%96%e7%9a%84%e5%b8%b8%e8%a7%81%e9%85%8d%e7%bd%ae%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/15789\/","title":{"rendered":"Linux\u4e0b\u4f7f\u7528GCC\u8fdb\u884c\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7"},"content":{"rendered":"<p>\u4e0b\u4f7f\u7528gcc\u8fdb\u884c\u5d4c\u5165\u5f0farm\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7<\/p>\n<p>\u6458\u8981\uff1a<br \/>\u968f\u7740\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u666e\u53ca\u548c\u53d1\u5c55\uff0c\u5bf9\u6027\u80fd\u7684\u8981\u6c42\u65e5\u76ca\u63d0\u9ad8\uff0c\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4f18\u5316\u6210\u4e3a\u975e\u5e38\u91cd\u8981\u7684\u73af\u8282\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5728Linux\u4e0b\u4f7f\u7528GCC\u8fdb\u884cARM\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7\uff0c\u5e76\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u8fdb\u884c\u8be6\u7ec6\u8bf4\u660e\u3002\u8fd9\u4e9b\u914d\u7f6e\u6280\u5de7\u5305\u62ec\u7f16\u8bd1\u9009\u9879\u3001\u5185\u8054\u6c47\u7f16\u3001\u5bc4\u5b58\u5668\u9009\u62e9\u548c\u5faa\u73af\u4f18\u5316\u7b49\u65b9\u9762\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5145\u5206\u53d1\u6325ARM\u67b6\u6784\u7684\u6027\u80fd\u4f18\u52bf\u3002<\/p>\n<ol>\n<li>\u7f16\u8bd1\u9009\u9879<br \/>GCC\u7f16\u8bd1\u5668\u63d0\u4f9b\u4e86\u4e00\u4e9b\u9009\u9879\u7528\u4e8e\u4f18\u5316ARM\u6c47\u7f16\u4ee3\u7801\u3002\u5e38\u7528\u7684\u9009\u9879\u6709-O\uff08\u4f18\u5316\u7ea7\u522b\uff09\u3001-march\uff08\u76ee\u6807\u67b6\u6784\uff09\u3001-mtune\uff08\u76ee\u6807\u5904\u7406\u5668\u7c7b\u578b\uff09\u7b49\u3002<\/li>\n<\/ol>\n<p>\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u884c\u914d\u7f6e\u7f16\u8bd1\u9009\u9879\uff1a<\/p>\n<pre>gcc -O3 -march=armv7-a -mtune=cortex-a9 -c mycode.c -o mycode.o<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u91cc\u7684-O3\u8868\u793a\u6700\u9ad8\u7ea7\u522b\u7684\u4f18\u5316\uff0c-march=armv7-a\u6307\u5b9a\u76ee\u6807\u67b6\u6784\u4e3aARMv7-A\uff0c-mtune=cortex-a9\u6307\u5b9a\u76ee\u6807\u5904\u7406\u5668\u7c7b\u578b\u4e3aCortex-A9\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6e\u7f16\u8bd1\u9009\u9879\uff0c\u53ef\u4ee5\u4f7f\u5f97\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<ol>\n<li>\u5185\u8054\u6c47\u7f16<br \/>GCC\u63d0\u4f9b\u4e86\u5185\u8054\u6c47\u7f16\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u5728C\u4ee3\u7801\u4e2d\u76f4\u63a5\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u3002\u5185\u8054\u6c47\u7f16\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5145\u5206\u53d1\u6325\u6c47\u7f16\u8bed\u8a00\u7684\u4f18\u52bf\uff0c\u5e76\u4e14\u53ef\u4ee5\u5b9e\u73b0\u66f4\u9ad8\u7684\u6027\u80fd\u3002<\/li>\n<\/ol>\n<p>\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>int add(int a, int b)\n{\n    int result;\n    asm volatile(\n        \"add %[result], %[a], %[b]\"\n        : [result] \"=r\"(result)\n        : [a] \"r\"(a), [b] \"r\"(b)\n    );\n    return result;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u5185\u8054\u6c47\u7f16\u5b9e\u73b0\u4e86\u4e24\u4e2a\u6574\u6570\u76f8\u52a0\u7684\u529f\u80fd\u3002\u901a\u8fc7\u4f7f\u7528%[result]\u3001%[a]\u548c%[b]\u53d8\u91cf\u66ff\u4ee3\u5bf9\u5e94\u7684\u5bc4\u5b58\u5668\uff0c\u53ef\u4ee5\u5728\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4e2d\u5f15\u7528C\u4ee3\u7801\u4e2d\u7684\u53d8\u91cf\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5145\u5206\u5229\u7528\u6c47\u7f16\u8bed\u8a00\u7684\u7075\u6d3b\u6027\uff0c\u5b9e\u73b0\u66f4\u9ad8\u6548\u7684\u4ee3\u7801\u3002<\/p>\n<ol>\n<li>\u5bc4\u5b58\u5668\u9009\u62e9<br \/>\u5728\u7f16\u5199\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4ee3\u7801\u65f6\uff0c\u9009\u62e9\u5408\u9002\u7684\u5bc4\u5b58\u5668\u5bf9\u4e8e\u6027\u80fd\u4f18\u5316\u975e\u5e38\u91cd\u8981\u3002\u4e00\u65b9\u9762\uff0c\u8981\u5145\u5206\u5229\u7528ARM\u67b6\u6784\u63d0\u4f9b\u7684\u591a\u4e2a\u5bc4\u5b58\u5668\uff0c\u907f\u514d\u9891\u7e41\u7684\u6570\u636e\u52a0\u8f7d\u548c\u5b58\u50a8\u64cd\u4f5c\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u8981\u907f\u514d\u5bc4\u5b58\u5668\u6ea2\u51fa\u548c\u51b2\u7a81\uff0c\u786e\u4fdd\u6c47\u7f16\u4ee3\u7801\u8fd0\u884c\u7684\u6b63\u786e\u6027\u3002<\/li>\n<\/ol>\n<p>\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>int multiply(int a, int b)\n{\n    int result;\n    asm volatile(\n        \"mov r0, %[a]\n\"\n        \"mov r1, %[b]\n\"\n        \"mul %[result], r0, r1\"\n        : [result] \"=r\"(result)\n        : [a] \"r\"(a), [b] \"r\"(b)\n        : \"r0\", \"r1\"\n    );\n    return result;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5bc4\u5b58\u5668r0\u548cr1\u5206\u522b\u5b58\u50a8\u8f93\u5165\u53c2\u6570a\u548cb\uff0c\u7136\u540e\u4f7f\u7528mul\u6307\u4ee4\u8fdb\u884c\u4e58\u6cd5\u8fd0\u7b97\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230result\u53d8\u91cf\u4e2d\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u5bc4\u5b58\u5668\uff0c\u53ef\u4ee5\u907f\u514d\u5bc4\u5b58\u5668\u6ea2\u51fa\u548c\u51b2\u7a81\u7684\u95ee\u9898\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u3002<\/p>\n<ol>\n<li>\u5faa\u73af\u4f18\u5316<br \/>\u5728\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5faa\u73af\u662f\u7ecf\u5e38\u7528\u5230\u7684\u63a7\u5236\u7ed3\u6784\u3002\u4f18\u5316\u5faa\u73af\u4ee3\u7801\u53ef\u4ee5\u660e\u663e\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6027\u80fd\u3002GCC\u7f16\u8bd1\u5668\u63d0\u4f9b\u4e86\u4e00\u4e9b\u4f18\u5316\u9009\u9879\uff0c\u7528\u4e8e\u4f18\u5316\u5faa\u73af\u4ee3\u7801\u3002<\/li>\n<\/ol>\n<p>\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>void sum(int *data, int size)\n{\n    int sum = 0;\n    for (int i = 0; i &lt;p&gt;\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u4f18\u5316\u5faa\u73af\u4ee3\u7801\uff0c\u5c06\u7d2f\u52a0\u64cd\u4f5c\u653e\u5165\u4e86\u6c47\u7f16\u90e8\u5206\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u51cf\u5c11\u5faa\u73af\u7ed3\u675f\u6761\u4ef6\u7684\u5224\u65ad\uff0c\u63d0\u9ad8\u5faa\u73af\u7684\u6267\u884c\u6548\u7387\u3002\u540c\u65f6\uff0c\u6211\u4eec\u4f7f\u7528\u5bc4\u5b58\u5668r0\u5b58\u50a8\u7d2f\u52a0\u7ed3\u679c\uff0c\u901a\u8fc7\u5408\u7406\u9009\u62e9\u5bc4\u5b58\u5668\uff0c\u907f\u514d\u5bc4\u5b58\u5668\u6ea2\u51fa\u548c\u51b2\u7a81\u7684\u95ee\u9898\u3002&lt;\/p&gt;&lt;p&gt;\u7ed3\u8bba\uff1a&lt;br&gt;\u672c\u6587\u4ecb\u7ecd\u4e86\u5728linux\u4e0b\u4f7f\u7528gcc\u8fdb\u884c\u5d4c\u5165\u5f0farm\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7\uff0c\u5e76\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u8fdb\u884c\u4e86\u8be6\u7ec6\u8bf4\u660e\u3002\u8fd9\u4e9b\u914d\u7f6e\u6280\u5de7\u5305\u62ec\u7f16\u8bd1\u9009\u9879\u3001\u5185\u8054\u6c47\u7f16\u3001\u5bc4\u5b58\u5668\u9009\u62e9\u548c\u5faa\u73af\u4f18\u5316\u7b49\u65b9\u9762\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5145\u5206\u53d1\u6325ARM\u67b6\u6784\u7684\u6027\u80fd\u4f18\u52bf\uff0c\u63d0\u9ad8\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u6027\u80fd\u548c\u6548\u7387\u3002&lt;\/p&gt;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fLinux\u4e0b\u4f7f\u7528GCC\u8fdb\u884c\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u4f7f\u7528gcc\u8fdb\u884c\u5d4c\u5165\u5f0farm\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7 \u6458\u8981\uff1a\u968f\u7740\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u666e\u53ca\u548c\u53d1\u5c55\uff0c\u5bf9\u6027\u80fd\u7684\u8981\u6c42\u65e5\u76ca\u63d0\u9ad8\uff0c\u5d4c\u5165\u5f0fARM\u6c47\u7f16\u4f18\u5316\u6210\u4e3a\u975e\u5e38\u91cd\u8981\u7684\u73af\u8282\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5728Linux\u4e0b\u4f7f\u7528GCC\u8fdb\u884cARM\u6c47\u7f16\u4f18\u5316\u7684\u5e38\u89c1\u914d\u7f6e\u6280\u5de7\uff0c\u5e76\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u8fdb\u884c\u8be6\u7ec6\u8bf4\u660e\u3002\u8fd9\u4e9b\u914d\u7f6e\u6280\u5de7\u5305\u62ec\u7f16\u8bd1\u9009\u9879\u3001\u5185\u8054\u6c47\u7f16\u3001\u5bc4\u5b58\u5668\u9009\u62e9\u548c\u5faa\u73af\u4f18\u5316\u7b49\u65b9\u9762\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5145\u5206\u53d1\u6325ARM\u67b6\u6784\u7684\u6027\u80fd\u4f18\u52bf\u3002 \u7f16\u8bd1\u9009\u9879GCC\u7f16\u8bd1\u5668\u63d0\u4f9b\u4e86\u4e00\u4e9b\u9009\u9879\u7528\u4e8e\u4f18\u5316ARM\u6c47\u7f16\u4ee3\u7801\u3002\u5e38\u7528\u7684\u9009\u9879\u6709-O\uff08\u4f18\u5316\u7ea7\u522b\uff09\u3001-march\uff08\u76ee\u6807\u67b6\u6784\uff09\u3001-mtune\uff08\u76ee\u6807\u5904\u7406\u5668\u7c7b\u578b\uff09\u7b49\u3002 \u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u884c\u914d\u7f6e\u7f16\u8bd1\u9009\u9879\uff1a gcc -O3 -march=armv7-a -mtune=cortex-a9 -c mycode.c -o mycode.o \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u91cc\u7684-O3\u8868\u793a\u6700\u9ad8\u7ea7\u522b\u7684\u4f18\u5316\uff0c-march=armv7-a\u6307\u5b9a\u76ee\u6807\u67b6\u6784\u4e3aARMv7-A\uff0c-mtune=cortex-a9\u6307\u5b9a\u76ee\u6807\u5904\u7406\u5668\u7c7b\u578b\u4e3aCortex-A9\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6e\u7f16\u8bd1\u9009\u9879\uff0c\u53ef\u4ee5\u4f7f\u5f97\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\u66f4\u52a0\u9ad8\u6548\u3002 \u5185\u8054\u6c47\u7f16GCC\u63d0\u4f9b\u4e86\u5185\u8054\u6c47\u7f16\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u5728C\u4ee3\u7801\u4e2d\u76f4\u63a5\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u3002\u5185\u8054\u6c47\u7f16\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5145\u5206\u53d1\u6325\u6c47\u7f16\u8bed\u8a00\u7684\u4f18\u52bf\uff0c\u5e76\u4e14\u53ef\u4ee5\u5b9e\u73b0\u66f4\u9ad8\u7684\u6027\u80fd\u3002 \u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a int add(int a, int b) { int result; asm volatile( &#8220;add %[result], %[a], %[b]&#8221; : [result] &#8220;=r&#8221;(result) : [a] &#8220;r&#8221;(a), [b] &#8220;r&#8221;(b) ); return result; } \u767b\u5f55\u540e\u590d\u5236 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