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October 2009
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2009.10.07 19:25 "Wrong Native Bit Order on Intel x86_64", by Eskandar Ensafi
Hello, 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. In the tiff-4.0 source code, I traced the problem to line 16124 of the configure script (or line 327 of configure.ac), where the script checks for i*86* instead of i*86*|x86_64. Unless there is a good reason for the native bit order to be MSB-to-LSB on x86_64, I believe that this is a bug and needs to be corrected so that all Intel and AMD x86 varieties are properly identified as LSB-to-MSB architectures. Best regards, Eskandar