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2009.10.07 20:47 "Re: Wrong Native Bit Order on Intel x86_64", by Igor Skochinsky
Hello Bob, Wednesday, October 7, 2009, 9:59:45 PM, you wrote: BF> On Wed, 7 Oct 2009, Eskandar Ensafi wrote: >> >> I noticed that when I tried to compile tiff-4.0.0-beta4, the native bit >> order on 64-bit x86_64 systems was >> determined to be FILLORDER_MSB2LSB (not correct as far as I know) whereas >> on 32-bit x86 systems, it is >> correctly determined to be FILLORDER_LSB2MSB. I checked my current >> tiff-3.8.2 installation (the standard >> package provided in Red Hat Enterprise Linux 5.4), and the same >> discrepancy existed in tiff-3.8. BF> This is very interesting. It seems like there should be some BF> efficient way to determine this at run-time rather than via the BF> configure script. I am not sure how to test for native fill order BF> though. My guess would be: if ( (1<<1) == 2 ) // LSB2MSB else // MSB2LSB -- WBR, Igor mailto:skochinsky@mail.ru