Hi I hope I email to correct mailing list...
It seems that '/proc/cpuinfo' doesn't report 3dnow and 3dnowext support correctly. Because I had been using it for recognizing processor features I looked briefly into fhandler_proc.cc (taken freshly from cvs) and I think I fixed the problem. The changed file compiles and *should* correctly detect presence of 3dnow instruction support (by using AMD's 0x8000..1 extended function). I haven't have time to test it (= figure out how build+install process actually works) because I decided to write my own cpuid detection routines from scratch instead. Patch is under whatever license needed to make it possible to use it. Thanks for cygwin people for doing good job and bringing unix to windows. -- Tomas Ukkonen [EMAIL PROTECTED]
700a701,706 > > // vendor identification > bool is_amd=false, is_intel=false; > if(!strcmp((char*)vendor_id, "AuthenticAMD")) is_amd = true; > else if(!strcmp((char*)vendor_id, "GenuineIntel")) is_intel = true; > 867a874,892 > > if(is_amd){ > // uses AMD extended calls to check > // for 3dnow and 3dnow extended support > // (source: AMD Athlon Processor Recognition Application Note) > > unsigned int _a = 0, _b, _c, _d; > cpuid(&_a,&_b,&_c,&_d, 0x80000000); > > if(_a >= 0x80000001){ // has basic capabilities > cpuid(&_a,&_b,&_c,&_d, 0x80000001); > > if(_d & (1 << 30)) // 31th bit is on > print (" 3dnowext"); > > if(_d & (1 << 31)) // 32th bit (highest) is on > print (" 3dnow"); > } > }
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