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Changes since last: Added Altivec and MMX2 alternatives. Use a constructor instead of an explicit call during libcpp initialization. Andi, I switched back to an indirect function call. With 4 alternatives the code generation inside of _cpp_clean_line looked pretty awful. Tested on {i686,x86_64,ppc64,ia64}-linux. On the ppc64 box, I used BOOT_CFLAGS with -mcpu=G5 in order to enable the Altivec path. Committed. r~
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