On Tue, 2012-06-12 at 04:33 -0400, Andrew Haley wrote: > On 06/11/2012 11:27 PM, Alan Cox wrote: > > Far from it. x32 is designed for performance. There are many applications > > where the additional space occupied by 64bit pointers is a measurable > > performance hit, but you still want to use the 64bit features of the CPU > > in all other respects. > > It's pretty unusual. Generally, the better ABI and supply of > registers is a win for gcc-compiled code . The pessimal case seems to > be Python, which not only has 64-bit pointers but 64-bit ints on a > 64-bit system. I suspect that nine times out of ten 64-bit is a win. Note that the extra registers are a feature specific to x86_64 architectures. On PowerPC, for example, the memory hit is significant enough that the standard configuration is 64-bit kernel and 32-bit userspace, unless memory requirements dictate otherwise. > > Andrew. > -- Matthew Saltzman Clemson University Math Sciences mjs AT clemson DOT edu -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
