{"id":5248,"date":"2024-04-11T11:25:48","date_gmt":"2024-04-11T03:25:48","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=5248"},"modified":"2024-04-11T13:42:14","modified_gmt":"2024-04-11T05:42:14","slug":"android-c-c-plus-inline-assemble","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android-c-c-plus-inline-assemble.html","title":{"rendered":"Android C\/C++\u5f00\u53d1\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801"},"content":{"rendered":"
\n
\n \t<\/i> Read Time:<\/span>1 Minute, 11 Second <\/div>\n\n <\/div>\n

\u9996\u5148\u9700\u8981\u660e\u786e\u7684\u4e00\u70b9\u662f\uff0c\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u5728C\/C++\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\uff0c\u8fd9\u901a\u5e38\u662f\u51fa\u4e8e\u4e09\u4e2a\u76ee\u7684\uff1a\u6027\u80fd\u4f18\u5316\u3001\u7279\u5b9a\u6307\u4ee4\u9700\u6c42\u4ee5\u53ca\u5bf9\u8d44\u6e90\u7684\u7cbe\u7ec6\u5316\u7ba1\u7406\u3002<\/p>\n\n\n\n

\u8fd9\u662f\u56e0\u4e3a\u6c47\u7f16\u8bed\u8a00\u53ef\u4ee5\u5b9e\u73b0\u5bf9CPU\u5bc4\u5b58\u5668\u7684\u76f4\u63a5\u64cd\u4f5c\uff0c\u4ee5\u53ca\u5bf9\u5185\u5b58\u7684\u7cbe\u786e\u63a7\u5236\uff0c\u65e0\u9700\u4eceC\/C++\u4ee3\u7801\u8fdb\u884c\u8f6c\u8bd1\uff0c\u80fd\u591f\u63d0\u5347\u6211\u4eec\u7684\u8f6f\u4ef6\u8fd0\u884c\u6548\u7387\u4ece\u800c\u5b9e\u73b0\u6027\u80fd\u4f18\u5316\uff0c\u540c\u65f6\u67d0\u4e9bCPU\u7279\u6709\u7684\u6307\u4ee4\u96c6\u5728C\/C++\u4e2d\u6ca1\u6709\u76f8\u5173\u7684\u652f\u6301\uff0c\u6b64\u65f6\u4e5f\u53ea\u6709\u901a\u8fc7\u6c47\u7f16\u6765\u5b9e\u73b0\u76f8\u5173\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u5728Android\u7cfb\u7edfC\/C++\u5f00\u53d1\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\uff0c\u901a\u5e38\u91c7\u7528\u4e24\u79cd\u65b9\u5f0f\uff1a\u5185\u5d4c\u6c47\u7f16\u3001\u5916\u90e8\u6c47\u7f16\u6587\u4ef6\u3002<\/p>\n\n\n\n

\u5185\u5d4c\u6c47\u7f16\uff08Inline Assembly\uff09<\/strong>\uff1a\u8fd9\u662f\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u5728C\u4ee3\u7801\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u7247\u6bb5\u3002\u8bed\u6cd5\u548c\u5177\u4f53\u5b9e\u73b0\u4f9d\u8d56\u4e8e\u7f16\u8bd1\u5668\uff0c\u901a\u5e38\u4f7f\u7528\u7279\u5b9a\u7684\u5173\u952e\u5b57\u6216\u8005\u8bed\u6cd5\u6765\u6807\u8bc6\u6c47\u7f16\u4ee3\u7801\u3002\u4f8b\u5982\uff0c\u5728GCC\u548cClang\u7f16\u8bd1\u5668\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528asm\u5173\u952e\u5b57\u6765\u6807\u8bc6\u5185\u5d4c\u6c47\u7f16\u4ee3\u7801\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n

\/\/ frameworks\/av\/media\/libaudioprocessing\/AudioResamplerSinc.cpp\nstatic inline\nint32_t mulAdd(int16_t in, int32_t v, int32_t a)\n{\n#if USE_INLINE_ASSEMBLY\n    int32_t out;\n    asm( \"smlawb %[out], %[v], %[in], %[a] \\n\"\n         : [out]\"=r\"(out)\n         : [in]\"%r\"(in), [v]\"r\"(v), [a]\"r\"(a)\n         : );\n    return out;\n#else\n    return a + int32_t((int64_t(v) * in) >> 16);\n#endif\n}<\/code><\/pre>\n\n\n\n
\u9664\u4e86\u5185\u5d4c\u6c47\u7f16\uff0c\u8fd8\u7ecf\u5e38\u7528\u5230\u5916\u90e8\u6c47\u7f16\u6587\u4ef6\u6587\u4ef6\u6765\u8fdb\u884c\u5d4c\u5165\u3002<\/p>\n\n\n\n
\u5916\u90e8\u6c47\u7f16\u6587\u4ef6\uff08External Assembly Files\uff09<\/strong>\uff1a\u5c06\u6c47\u7f16\u4ee3\u7801\u5355\u72ec\u5b58\u653e\u5728\u4e00\u4e2a\u6c47\u7f16\u6587\u4ef6\u4e2d\uff0c\u7136\u540e\u901a\u8fc7C\u8bed\u8a00\u7684\u51fd\u6570\u8c03\u7528\u6765\u8c03\u7528\u8fd9\u4e9b\u6c47\u7f16\u51fd\u6570\u3002\u5728\u6c47\u7f16\u6587\u4ef6\u4e2d\uff0c\u9700\u8981\u6309\u7167\u7279\u5b9a\u7684\u8c03\u7528\u7ea6\u5b9a\u6765\u5b9a\u4e49\u51fd\u6570\u63a5\u53e3\u4ee5\u53ca\u53c2\u6570\u4f20\u9012\u65b9\u5f0f\u3002C\u8bed\u8a00\u4ee3\u7801\u901a\u8fc7\u51fd\u6570\u8c03\u7528\u6765\u89e6\u53d1\u5bf9\u5e94\u7684\u6c47\u7f16\u4ee3\u7801\u6267\u884c\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
void SwapContext(char **src_sp, char **dest_sp)\n{\n    ctx_swap(reinterpret_cast<void **>(src_sp), reinterpret_cast<void **>(dest_sp));\n}<\/code><\/pre>\n\n\n\n
\u5176\u4e2dctx_swap\u7684\u8c03\u7528\u5bf9\u5e94\u6c47\u7f16\u6e90\u6587\u4ef6\u4e2d\u63d0\u4f9b\u7684symbol\uff0c\u4e00\u822c\u6211\u4eec\u4f1a\u5c06\u6c47\u7f16\u6587\u4ef6\u4ee5.S\u6216\u8005.asm\u7ed3\u5c3e\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\/\/swap_aarch64.S   source code\n.globl ctx_swap\n.type  ctx_swap, @function\nctx_swap:\n      push %edi\n      push %ebx\n      push %ebp\n      movl %esp, (%edi)\n\n      movl (%esi), %esp\n      pop %ebp\n      pop %ebx\n      pop %edi<\/code><\/pre>\n\n\n\n
\u5728\u7f16\u8bd1\u94fe\u63a5\u5b8c\u6210\u540e\u5c31\u80fd\u5b9e\u73b0\u5728C\u4ee3\u7801\u4e2d\u8c03\u7528\u6c47\u7f16\u4ee3\u7801\u3002<\/p>\n\n\n\n
\u5728Android\u7cfb\u7edf\u4e2d\u6211\u4eec\u4e00\u822c\u63a8\u8350\u4f7f\u7528\u5916\u90e8\u6c47\u7f16\u6587\u4ef6\u7684\u65b9\u5f0f\u8fdb\u884c\u5d4c\u5165\uff0c\u8fd9\u6837\u80fd\u591f\u5177\u6709\u66f4\u597d\u7684\u7075\u6d3b\u6027\uff0c\u56e0\u4e3a\u6c47\u7f16\u4ee3\u7801\u4e0eCPU\u67b6\u6784\u662f\u5f3a\u76f8\u5173\u7684\u3002\u4e3a\u4e86\u591a\u5e73\u53f0\u7684\u9002\u914d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728Android.bp\u4e2d\u533a\u5206\u4e0d\u540c\u7684CPU\u67b6\u6784\u4ece\u800c\u5f15\u5165\u4e0d\u540c\u7684\u5916\u90e8\u6c47\u7f16\u6587\u4ef6\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\/\/Android.bp\ncc_library_shared {\nsrcs:[\n  example.cc\n],\n\u2026..\narch:{\n        arm64:{\n            srcs:[\"croutine\/detail\/swap_aarch64.S\"],\n        },\n        arm:{\n            srcs:[\"croutine\/detail\/swap_aarch64.S\"],\n        },\n        x86:{\n            srcs:[\"croutine\/detail\/swap_x86_32.S\"],\n        },\n        x86_64:{\n            srcs:[\"croutine\/detail\/swap_x86_64.S\"],\n        }\n},\n\u2026..\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u901a\u8fc7arch\u5b57\u6bb5\u5206\u522b\u533a\u5206\u4e86arm64\u3001arm\u3001x86\u4ee5\u53cax86_64\u4e0d\u540c\u7684\u67b6\u6784\uff0c\u8fdb\u800c\u5bfc\u5165\u4e0d\u540c\u7684\u6c47\u7f16\u6587\u4ef6\u3002<\/p>\n\n\n\n
\u5982\u679c\u6211\u4eec\u4e0d\u8003\u8651\u5e73\u53f0\u517c\u5bb9\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528asm\u5185\u5d4c\u6c47\u7f16\uff0c\u4e0d\u8fc7\u8fd9\u91cc\u6709\u4e00\u4e2a\u5c0f\u7ec6\u8282\u662f\u6211\u4eec\u7684\u7a0b\u5e8f\u9ed8\u8ba4\u4f1a\u7f16\u8bd132+64\u4f4d\u7684\uff0c\u6b64\u65f6asm\u5185\u5d4c\u6c47\u7f16\u53ef\u80fd\u4f1a\u62a5\u9519\uff0c\u4e00\u822c\u6211\u4eec\u9700\u8981\u5728Android.bp\u4e2d\u901a\u8fc7compile_multilib\u5b57\u6bb5\u8fdb\u884c\u914d\u7f6e\uff0c\u7f16\u8bd1\u6307\u5b9a\u7c7b\u578b\u7684\u4ea7\u7269\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
cc_library_shared {\n   compile_multilib: \"64\",\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u901a\u8fc7compile_multilib\u5b57\u6bb5\u6307\u5b9a\u4ec5\u7f16\u8bd164\u4f4d\u7a0b\u5e8f\uff0c\u4ece\u800c\u786e\u4fddasm\u5d4c\u5165\u6c47\u7f16\u53ef\u4ee5\u6b63\u5e38\u7f16\u8bd1\u901a\u8fc7\u3002<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    1<\/span>\n                        \n                                                100<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
Android C\/C++\u5f00\u53d1\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u7684\u65b9\u6cd5<\/p>","protected":false},"author":1,"featured_media":4483,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[18],"tags":[46],"class_list":["post-5248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-system","tag-android"],"blocksy_meta":[],"aioseo_notices":[],"featured_image_urls":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable":"
Android C\/C++\u5f00\u53d1\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u7684\u65b9\u6cd5<\/p>\n","category_list":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable_v2":"
Android C\/C++\u5f00\u53d1\u4e2d\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801\u7684\u65b9\u6cd5<\/p>\n","category_list_v2":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info_v2":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num_v2":"0 comments","_links":{"self":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/comments?post=5248"}],"version-history":[{"count":4,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5248\/revisions"}],"predecessor-version":[{"id":5252,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5248\/revisions\/5252"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media\/4483"}],"wp:attachment":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media?parent=5248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/categories?post=5248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/tags?post=5248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}