Pettenò: Debunking x32 myths
Posted Jun 26, 2012 9:56 UTC (Tue) by farnz
Parent article: Pettenò: Debunking x32 myths
A question I've not seen answered elsewhere (I'll post a comment on Diego's blog as well, in case he doesn't read this). Does anyone have figures showing that MIPS n32 is faster than MIPS n64?
For background, there were (in the IRIX days) 3 MIPS ABIs. o32 was the original 32 bit ABI, for 32-bit MIPS CPUs. When MIPS got a 64-bit version, IRIX sprouted two new ABIs; n64 was a true 64-bit ABI, using 64 bit pointers. n32 was also a 64-bit ABI, but with 32 bit pointers; aside from the pointer size difference, n32 and n64 were the same.
This seems to me (naively) to parallel the x86 situation very nicely; i386 is the x86 equivalent of o32, AMD64 is the x86 equivalent of n64, and now people are trying to build an equivalent of n32 called x32.
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