Ingo Adlung wrote: >Not only may the distributors at some point choose to >deprecate 31 (32) bit compat mode, but all performance >optimizations for the gcc compiler back-end for >new Z hardware are done for 64-bit only.
OK, that's some confirmation of what I suspected might be happening. And I assume it's exactly the same story for all the other 64-bit processor architectures (X86-64, Power, ARM), that the compiler and processor design people are focusing on optimizing 64-bit programs. I recommend focusing on the compilers and their optimizers. As mentioned, IBM's JVMs and JIT already reduce bit counts opportunistically, and with some parameter overrides available if you don't like the defaults. Compilers might be able to do the same thing, especially if you give the compiler some hints about your code and its needs. If there are benefits available yet to be won (are there?), they'll be most winnable there. -------------------------------------------------------------------------------------------------------- Timothy Sipples IT Architect Executive, Industry Solutions, IBM Z & LinuxONE, Multi-Geography E-Mail: [email protected] ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
