{"id":251,"date":"2012-03-31T22:20:54","date_gmt":"2012-03-31T14:20:54","guid":{"rendered":"http:\/\/hymike.net\/blog\/?p=251"},"modified":"2012-03-31T22:20:54","modified_gmt":"2012-03-31T14:20:54","slug":"%e6%b7%b1%e5%ba%a6%e4%bc%98%e5%8c%96%ef%bc%9a%e5%ad%a6%e4%b9%a0sse%e6%8c%87%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/blog.hymike.net\/?p=251","title":{"rendered":"\u6df1\u5ea6\u4f18\u5316\uff1a\u5b66\u4e60SSE\u6307\u4ee4"},"content":{"rendered":"<p>\u7a0b\u5e8f\u8dd1\u7684\u592a\u6162\u600e\u4e48\u529e\uff1f\u4e4b\u524d\u6211\u7ed9\u51fa\u7684\u7b54\u6848\u662f\uff1a\u7528x64\u73af\u5883\u7f16\u8bd1\u6267\u884c\u7a0b\u5e8f\uff1b\u7528\u591a\u7ebf\u7a0b\u3001\u591a\u8fdb\u7a0b\u6a21\u5f0f\uff1b\u7528CUDA\u52a0\u901f\u3002\u800c\u73b0\u5728\uff0c\u53c8\u6709\u4e86\u4e00\u79cd\u65b0\u7684\u89e3\u51b3\u65b9\u6848\uff1a\u7528CPU\u7684SSE\u3001SSE2\u7b49\u6307\u4ee4\u96c6\u3002<\/p>\n<p>\u56e0\u4e3a\u5904\u7406\u56fe\u50cf\u6570\u636e\u65f6\u5927\u91cf\u7528\u5230\u6d6e\u70b9\u6570\u64cd\u4f5c\uff0c\u800c\u4e14\u90fd\u662f\u4e00\u8fde\u4e32\u4e00\u8d77\u4f7f\u7528\u7684\uff0c\u6240\u4ee5\uff0c\u7528SSE2\u52a0\u901f\u53ef\u4ee5\u53d6\u5f97\u8f83\u597d\u7684\u6548\u679c\u3002\u53c2\u89c1<a href=\"http:\/\/dev.gameres.com\/Program\/Other\/sseintro.htm\">http:\/\/dev.gameres.com\/Program\/Other\/sseintro.htm<\/a>\u7684\u76f8\u5173\u4ee3\u7801\uff0c\u81ea\u5df1\u6a21\u4eff\u4e86\u4e00\u4e0b\uff0c\u53d1\u73b0\u5f88\u5bb9\u6613\u5199\uff1a<\/p>\n<p><code lang=\"c\"><\/p>\n<p>int calc_simi(float *feat)<br \/>\n{<br \/>\n\tint i,j;<br \/>\n\tfloat *a,*b,t;<br \/>\n\tfloat min_dst = 99999;<br \/>\n\tfloat dst;<br \/>\n\tint id=0;<br \/>\n\tfor(i=0;i<row;i++)\n\t{\n\t\ta = feat;\n\t\tb = dic[i];\n\t\tdst=0;\n\t\tfor(j=0;j<col;j++)\n\t\t{\n\t\t\tt=*a - *b;\n\t\t\tdst+=t*t;\n\t\t\ta++;\n\t\t\tb++;\n\t\t}\n\t\tif(dst<min_dst)\n\t\t{\n\t\t\tmin_dst = dst;\n\t\t\tid = i;\n\t\t}\n\t}\n\treturn id;\n}\nint calc_simi_sse(float *feat)\n{\n\tint i,j,jsize=col\/4;\n\tfloat *a,*b,t;\n\tfloat min_dst = 99999;\n\tfloat dst;\n\tint id=0;\n\t__m128* pDic;\n\t__m128* pFeat;\n\t__m128 pRes;\n\t__m128 temp;\n\tfor(i=0;i<row;i++)\n\t{\n\t\tpDic=(__m128*)dic[i];\n\t\tpFeat=(__m128*)feat;\n\t\tpRes = _mm_set_ps1(0.0);\n\t\tfor(j=0;j<jsize;j++)\n\t\t{\n\t\t\ttemp = _mm_sub_ps(*pDic,*pFeat);\n\t\t\ttemp = _mm_mul_ps(temp,temp);\n\t\t\tpRes = _mm_add_ps(temp, pRes);\n\t\t\tpDic++;\n\t\t\tpFeat++;\n\t\t}\n\t\tdst = pRes.m128_f32[0] + pRes.m128_f32[1] + pRes.m128_f32[2] + pRes.m128_f32[3];\n\t\tif(dst<min_dst)\n\t\t{\n\t\t\tmin_dst = dst;\n\t\t\tid = i;\n\t\t}\n\t}\n\treturn id;\n}\n<\/code><\/p>\n<p>\u5176\u4e2ddic\u662f\u4e00\u4e2a\u4e8c\u7ef4\u77e9\u9635\uff0c\u76ee\u7684\u662f\u6c42\u51fa\u5f53\u524dfeat\u5411\u91cf\u548c\u4e8c\u7ef4\u77e9\u9635\u4e2d\u54ea\u4e00\u884c\u5411\u91cf\u7684\u5dee\u6700\u5c0f\uff0c\u8fd4\u56de\u8fd9\u4e2aid\u3002calc_simi\u662f\u666e\u901a\u7684\u5b9e\u73b0\uff0ccalc_simi_sse\u662f\u5229\u7528sse2\u6307\u4ee4\u96c6\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u5e9f\u8bdd\u4e0d\u591a\u8bf4\uff0c\u770b\u65f6\u95f4\u6d4b\u8bd5\u65f6\u95f4\uff1a<\/p>\n<p>\t\t\tx86\tx64<br \/>\nprecise\t\t\t1224\t371<br \/>\nfast\t\t\t301\t302<br \/>\nprecise_sse\t\t146\t114<br \/>\nfast_sse\t\t148\t119<\/p>\n<p>\u5176\u4e2d\uff0cprecise\u548cfast\u5bf9\u5e94\u7f16\u8bd1\u5668\u9009\u9879\u5f53\u4e2d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u8981\u6c42\uff08\u56e0\u4e3a\u53d1\u73b0\u7ed3\u679c\u6728\u6709\u5dee\u5f02\u3002\u3002\uff09\uff0c_sse\u4ee3\u8868\u5229\u7528\u4e86sse\u6307\u4ee4\u96c6\uff08\u7f16\u8bd1\u5668\u4f18\u5316\u5f53\u4e2d\u4e0d\u8981\u9009\u4f7f\u7528sse2\uff0c\u8fd9\u6837\u4f1a\u53d8\u6162\u2026\u2026\uff09\uff0cx86\u548cx64\u4ee3\u8868\u7f16\u8bd1\u73af\u5883\uff0c\u7531\u6b64\u53ef\u4ee5\u53d1\u73b0\uff0csse\u4f1a\u5feb\uff0c\u800c\u4e14\u5728x64\u4e0b\u6bd4fast\u6d6e\u70b9\u8fd0\u7b97\u8fd8\u5feb\u4e862.5\u500d\u5de6\u53f3\uff01\u56e0\u4e3asse2\u6bcf\u6b21\u5904\u74064\u4e2a\u6d6e\u70b9\u6570\uff0c\u6240\u4ee5\u6700\u591a\u4e5f\u5c31\u5feb4\u500d\uff0c\u6548\u679c\u5f88\u663e\u8457\u4e86~<\/p>\n<p>so\uff0c\u6700\u7ec8\u7248\u7684\u4f18\u5316\u770b\u6765\u4f1a\u7ed3\u5408sse2\u3001\u591a\u7ebf\u7a0b\u6280\u672f\u5427\uff08\u56e0\u4e3aCUDA\u548csse2\u51b2\u7a81\uff0c\u800csse2\u7a33\u5b9a\u2026\u2026\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7a0b\u5e8f\u8dd1\u7684\u592a\u6162\u600e\u4e48\u529e\uff1f\u4e4b\u524d\u6211\u7ed9\u51fa\u7684\u7b54\u6848\u662f\uff1a\u7528x64\u73af\u5883\u7f16\u8bd1\u6267\u884c\u7a0b\u5e8f\uff1b\u7528\u591a\u7ebf\u7a0b\u3001\u591a\u8fdb\u7a0b\u6a21\u5f0f\uff1b\u7528CUDA\u52a0\u901f\u3002\u800c\u73b0\u5728 &hellip; <a href=\"https:\/\/blog.hymike.net\/?p=251\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201c\u6df1\u5ea6\u4f18\u5316\uff1a\u5b66\u4e60SSE\u6307\u4ee4\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.hymike.net\/index.php?rest_route=\/wp\/v2\/posts\/251"}],"collection":[{"href":"https:\/\/blog.hymike.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hymike.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hymike.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hymike.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=251"}],"version-history":[{"count":0,"href":"https:\/\/blog.hymike.net\/index.php?rest_route=\/wp\/v2\/posts\/251\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.hymike.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hymike.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hymike.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}