Sergei Gorelkin schrieb: > Wednesday, July 11, 2007, 12:06:51 AM, Florian wrote: > > FK> Vinzent Hoefler schrieb: >>> On Tuesday 10 July 2007 09:58, Vinzent Hoefler wrote: >>>> On Tuesday 10 July 2007 12:40, Yury Sidorov wrote: >>>>> Maybe other way to detect SSE support exists... >>>> CPUID? >>> To be more precise, the way recommended by Intel: >>> >>> "To make this check, execute the CPUID instruction with an argument of 1 >>> in the EAX register, and check that bit 25 (SSE) and/or bit 26 (SSE2) >>> are set to 1." >>> >>> -- IA32 Software Developer's Manual, >>> Volume 3: System Programming Guide > >> This gives you only the information that the CPU supports it but not if >> the OS supports it. > > But, if CPU has no SSE2 support, then OS is unable to support it, too? > And if CPU has SSE2 support, modern OSes probably tend to support it. > Thus, by checking CPUID before attempting to execute an SSE2 > instruction you'll be able to exclude exceptions in vast majority of > cases. >
That's a point though I thought we could safe this extra check because I didn't expect that a lot of people are still using PII :) _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel