On Sun, 26 Mar 2017, Hal Murray wrote: > [email protected] said: > > Did you check out Linux' "X32 ABI" support? > > https://sites.google.com/site/x32abi/ > > Thanks. That seems to be what I was looking for. > > It's not in the Fedora kernels but is in Debian. I'll poke around more. > > > I guess I'm slightly surprised that there isn't more interest in that area. > Aside from memory usage, it also uses cache space which turns into general > performance. So any program with a lot of pointers would probably speed up. > I guess there aren't many programs that both fit in 32 bits and are > performance critical and use a lot of pointers.
The 32-bit x86 architecture is so register-crippled that C code typically runs about 15% faster when compiled for X86_64 than when compiled for i386, in spite of the poorer cache locality caused by the larger pointers. It is, however, useful to make 32-on-64-bit builds work for testing 32-bit issues. This is often more complicated than just adding "-m32" to the flags. Fred Wright _______________________________________________ devel mailing list [email protected] http://lists.ntpsec.org/mailman/listinfo/devel
